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NASA Reference Publication 1202 June 1988 _i. _-, p ,_. L Catalog of Open Clusters and Associated Interstellar Matter David Leisawitz H1/_o :_66-2£c[2 NASA https://ntrs.nasa.gov/search.jsp?R=19880020268 2018-07-28T14:26:54+00:00Z
Transcript

NASAReferencePublication1202

June 1988

_i. _-, p ,_.

L

Catalog of Open Clustersand Associated

Interstellar Matter

David Leisawitz

H1/_o

:_66-2£c[2

NASA

https://ntrs.nasa.gov/search.jsp?R=19880020268 2018-07-28T14:26:54+00:00Z

NASAReferencePublication1202

1988

N/LRANational Aeronauticsand Space Administration

Scientific and TechnicalInformation Division

Catalog of Open Clustersand Associated

Interstellar Matter

David Leisawitz

Goddard Space Flight CenterGreenbelt, Maryland

PREFACE

In this compilation, every effort has been made to report accurately the

observations of a large number of investigators. However, since this will be

the first widely distributed edition of the Catalog of Open Clusters and

Associated Interstellar Matter, for there to be a few misquotations is

inevitable. (I would greatly appreciate being informed of discrepancies when

they are discovered.) For this reason, but, more importantly because

measurements taken out of context are prone to misinterpretation, I recommend

using this catalog as a guide to information available about the clusters rather

than as a final source of information. The catalog format was designed to

facilitate location of original references.

My objective was to make the database a useful research tool for optlcal

observers and radio astronomers alike, and thus to help bridge a communication

barrier that separates astronomical subdlsclpllnes. The catalog description

that follows was written with that objective in mind.

D. Lelsawltz

March 1988

PRECEDING PAGE BLANK NOT FILMED

**°III * o

SUMMARY OF CONTENTS

INTRODUCTION ......................................

CLUSTER SAMPLE SELECTION CRITERIA AND SELECTION EFFECTS ......

SOURCES OF INFORMATION ..............................

DATABASE CONTENTS AND CATALOG FORMAT ..................Cluster Identification .................................

Spatial Coordinates ...................................Radial Velocities ....................................

Stellar Clusters ..................................

H II Regions ...................................Molecular Clouds ................ - .................

Proper Motions .....................................Distance ........................................

Angular Diameter ...................................Linear Diameter ....................................

Age . . . . . . ..... . . .... . ......... • • • • • • • • • • • • • • • •Masses .........................................

Stellar .......................................Atomic Gas ....................................Ionized Gas ....................................Molecular Clouds .................................Dust ........................................

Visual Extinction .................... ...............

Reddening .......................................

PROCESSING AND ANALYSIS SOFTWARE .......................

CATALOG OF OPEN CLUSTERS AND ASSOCIATED INTERSTELLAR MATTER

REFERENCES ......................................

vii

vii

xiii

xiiixiiixvixvixvixviixvii

.o.

XVlll

xviiixixxixxix

xxxxixxi

xxiixxii

o.,

XXlll.,o

XXlll...

XXlU

xxiv

258

PRECEDING PAGE BLANK NOT FILMED

'V

CATALOG OF OPEN CLUSTERS AND ASSOCIATED INTERSTELLAR MATTER

David Leisawltz

INTRODUCTION

Data pertaining to 128 open clusters, and the interstellar matter

associated or potentially associated with them, are compiled in this catalog.

Common names, aliases, and galactic coordinates of the catalogued clusters are

shown in Table i. Also tabulated are the names of OB associations of which the

clusters are members, and the Sharpless (S) and Westerhout (W) identifications

of H II regions ionized by the clusters.

The Open Cluster Interstellar Matter (0CISM) database from which this

catalog was produced is available in machlne-readable form, with accompanying

processing and analysis software, through the National Space Science Data Center

(NSSDC) at the NASA Goddard Space Flight Center.

Below we describe briefly the criteria used to select clusters for this

compilation_ known selection effects as a result of which there are differences

between the catalogued clusters and the population of all open clusters in the

Galaxy| how information for the OCISM database was obtalned_ the database

contents and catalog format_ and the associated processing and analysis

software.

CLUSTER SAMPLE SELECTION CRITERIA AND SELECTION EFFECTS

Clusters in the OCISM database satisfy four criteria: they are relatively

well studied (photometrically and, often, spectroscoplcally)_ their declinations

are _-20°_ they are more distant than ~1 kpc but not more distant than ~5 kpc_

and they are younger than ~100 Myr. Of the approximately 1200 known open

clusters, ~10Z satisfy these conditions.

The 0CISM database was created to document information that characterizes

open clusters and their interaction with the interstellar medium and the sample

selection criteria were specified accordingly. Because they are relatively

young, most OCISM clusters can be expected to be surrounded by the interstellar

fl&]mS"l_l_O PAGE BLANK NOT _ILMEO

vii

Table 1. Clusters in

Number in liI

Database 0CL (deg)

the Database

bii Name of

(deg) Connnon

Cluster

Alias

Member of H II Region

Association S W

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

19 6.13 -1.36 NGC 6530

23 6.99 -0.25 NGC 6514

26 7.72 -0.44 NGC 6531

33 11.99 -0.94 MARKAR 38

34 12.43 -3.22 TRUMP 33

M8

M20_ TRIFIDM21

BYURAKAN 5

35 12.80 -0.80 COLLIN 469

36 12.86 -1.32 NGC 6603 M24

40 14.15 -1.01 NGC 6613 M18

44 15.09 -0.74 NGC 6618 M1754 16.99 0.79 NGC 6611 M16

5666

67

68

74

7782

8396

99

I00

122

124

125

126

134

138

148

149

150

18.26

21.6423.86

23.95

26.28

27.3628.23

28.29

38.55

39.06

42.16

59.1659.41

60.1460.21

65.70

66.96

72.6472.73

72.76

73.2974.91

75.3675.71

76.66

1.69 NGC 6604

-0.78 NGC 6649

-2.92 NGC 6694-0.50 NGC 6664

-0.81 NGC 6683

-1.93 BASEL 1

-2.23 NGC 6704

-0.01 TRUMP 35

-1.70 NGC 6755

-1.69 NGC 6756

4.70 NGC 6709

-0.16 NGC 6820

-0.15 NGC 6823

-1.83 NGC 6830

-0.29 ROSLUND 2

1.18 NGC 6834

-1.26 ROSLUND 4

2.08 NGC 6871

1.74 BYURAKAN I

1.35 BYURAKAN 2

1.19 NGC 6883

3.29 BASEL 6

1.31 IC 4996

0.31 BERK 87

1.26 BERK 86

152157.1

158161

167

M26

APRIAMASVILI

SNR DA495

IC 495415

SGR OBI

SGR OB1

SGR OB1

SGR OB1

SGR OB1

SER OB1

SER OB1

SER 0B2

SCT OB2

VUL OB i

VUL 051

VUL OB1

VUL OB1

CYG OB3

CYG OB1

CYG OB1

CYG OB1

CYG OB1

CYG OB1

25 29

30

45

49

86

86

38

37

35

50

55

,°,

VUl

Table I. (continued)

Number in iii bli

Database OCL (deg) (deg)

Name of Cluster

Common Alias

Member of H II Region

Association S W

36 168 76.92 0.6037 177 78.09 2.79

38 181 78.66 2.03

39 197 85.46 -0.4740 205 89.93 -2.72

41 208 91.19 -1.67

42 210 91.32 2.26

43 213 94.39 -5.50

44 214 94.41 0.20

45 218 97.35 0.42

46 222 99.29 3.73

47 224 101.36 -2.20

48 229 102.72 0.7849 231 103.10 -1.18

50 235 103.99 14.27

51 236 104.02 6.45

52 237 104.04 0.86

53 - 106.76 5.30

54 244 107.08 -0.90

55 256 110.96 0.05

56 257 111.36 -0.20

57 260 112.76 0.46

58 273 116.21 -0.37

59 275 116.43 -0.79

60 276 116.59 -1.01

61 286 118.25 4.95

62 291 119.80 -1.38

63 294 120.25 -2.54

64 297 120.72 0.36

65 299 120.87 0.49

NGC 6913 M29

COLLIN 419 SNR 7CYG

NGC 6910 SNR 7CYGNGC 6996 NGC 7000

NGC 7062

NGC 7067

NGC 7031

IC 5146NGC 7086

NGC 7128

IC 1396

IC 1442

NGC 7235

BERK 94

NGC 7023

NGC 7160

NGC 7261

S 140

NGC 7380

NGC 7510

MARKAR 50

NGC 7654

HARVARD 21

NGC 7788NGC 7790

BERK 59

NGC 103

NGC 129

KING 14

NGC 146

66 306 122.09 1.33 KING 16

67 307 122.29 1.54 BERK 4

68 313 123.13 -6.24 NGC 281

69 314 123.99 1.10 BERK 62

70 316 124.68 -0.59 NGC 366

TRUMP 37

VdB 139

IC 1470

BYURAKAN 3

M52

CYG OB9

CYG OB7

CYG OB7

CYG OB7

CEP 0B2

CEP OB2

CEP 052

CEP OB2

CEP OB1

CAS OB2

CAS OB2

CAS OB5

CAS 055

CEP OB4

CAS OB4

CAS OB4

CAS OB4

CAS OB7

CAS OB7

CAS OB1

117 80

125

131

132

140

142

156

157

171

184

ix

Table 1. (continued)

Number in ill bll

Database OCL (deg) (deg)

Name of Cluster

Common Alias

Member of H II Region

Association S W

71

7273

7475

76

7778

7980

81

82

83

84

85

86

8788

89

90

91

92

93

94

95

96

9798

99

i00

101

102

103

104

105

319 125.90 -2.60 NGC 433

320 126.07 -3.91 NGC 436

321 126.56 -4.35 NOC 457

322 127.19 0.75 NGC 559

326 128.02 -1.76 NGC 581

328 128.22 -1.14 TRUMP 1

329 128.55 1.70 NGC 637

330 129.09 -0.35 NGC 654

332 129.34 -1.51 NGC 659

333 129.46 -0.94 NGC 663

339 130.74 2.65 STOCK 5

345 132.39 -6.16 NGC 744

349.1 134.21 -2.64 BASEL 10

350 134.63 -3.72 NGC 869

352 134.74 0.92 IC 1805

353 135.08 -3.60 NGC 884

356 135.67 2.31 CZERNIK 13

357 135.78 1.48 NGC 1027

359 135.79 -1.58 CZERNIK 8

360 135.84 0.27 BERK 65

361 136.02 -1.20 KING 4

362 136.34 -2.66 NGC 957

364 137.19 0.92 IC 1848

383 143.65 7.62 NGC 1502394 148.16 -1.29 NGC 1444

403 155.35 2.58 NGC 1624

404 157.08 -3.65 BERK 11

406 158.61 -1.58 NGC 1605

409 160.43 -17.74 IC 348

429 168.88 -2.00 NGC 1778

439 173.59 -1.70 NGC 1893

441 173.90 0.28 NGC 1931

445 174.52 1.04 NOC 1960

465 186.45 1.25 IC 2157

467 186.61 0.13 NGC 2129

MI03

h PERSEI

X PERSEI

IC 410

M36

CAS OB8

CAS OB8

CAS OB8

CAS OB8

PER OB1

PER 0B1

CAS OB6

PER OBI

CAM 0BI

CAS OB6

CAM OBI

CAM OB1

PER OB2

AUR OBI

AUR 0B2

AUR 0BI

AUR OBI

190

199

212

213

236

237

3,4

x

Table i. (continued)

Number in iii bII

Database OCL (de8) (deg)

Name of Cluster

Common Alias

Member of H II Region

Association S W

106107

108

109110

111

112

113

114

115

116117

118

119120

121

122

123

124

125

126

127

128

476 190.20 0.42 NGC 2175

481 195.63 -2.92 NGC 2169

495 202.94 2.20 NGC 2264

499 203.60 0.13 NGC 2251

502 204.62 13.96 NGC 2395

512 206.18 -2.29

515 206.42 -2.02518 207.14 -0.91

523 207.97 -3.38

527 208.56 -1.80

548 215.32 -2.30- 218.13 -0.39

559 221.67 -1.24

562 223.62 -1.27

565 224.32 -1.16

567 224.72 0.38575 226.57 -2.30

594 230.82 1.00

595 230.80 0.93598 231.41 1.96

NGC 2239

NGC 2244

COLLIN 107

COLLIN 96

V D BERGH

NGC 2286

MONOCEROS

NGC 2323

NGC 2335

NGC 2343

NGC 2353

NGC 2345

HAFFNER 10

CZERNIK 29

NGC 2414

626 236.24 0.08 NGC 2421

633 238.18 -5.53 NGC 2362

668 243.14 0.41 NGC 2467

ROSETTE

MS0

GEM OB1

MON OB1

MON OBI

MON OB2

MON OB2

MON OB1

MON OB1

CMA OB1

PUP OB2

252

273

275

287

310

311

16

xi

gas and dust from whence they came, or at least by what remains of that

material. The ages of clusters are gauged by comparing photometric and/or

spectroscopic data with stellar evolution models and the theoretical H-R

diagram. Clusters can be sorted or binned by age to evaluate the progress of

the stellar-lnterstellar interaction. One virtue of this method, which has been

employed with success by Gordon, Howard, and Westerhout (1968), Schwartz (1971),

Bash, Green, and Peters (1977), and Lelsawltz, Thaddeus, and Bash (1988), is

that the chronometer is independent of the interaction. It is feasible to

observe interstellar matter in a large number of regions, each ~50 pc in size,

with several arcmlnute spatial resolution, and possible to resolve interesting

interstellar structure, if the regions are at distances _1 kpc and _5 kpc. For

comparison, a typical open cluster diameter is ~3 pc (~i0' at 1 kpc); a 50 pc

molecular cloud is considered to be large| and the radiation energy density due

to a typical young cluster is equal to the energy density of the background

interstellar radiation field at ~40 pc. Clusters in the OCISM database can be

observed from the northern hemisphere.

The decision to include a cluster in the catalog was based primarily on data

tabulated by Alter, Ruprecht, and Vanysek (1970). Although recent analyses

suggest that the selection criteria are violated by a few of the clusters so

chosen, the offenders were retained.

Since open clusters in general are concentrated within ~100 pc of the

galactic plane, the sample of all known clusters is intrinsically biased by the

obscuring effect of dust in the Milky Way. Thus, for instance, only along

relatively transparent lines of sight are clusters more distant than a few kpc

observed optically. Such clear lines of sight are rare in the inner Galaxy (the

direction of the Carlna spiral arm is exceptional in this respect). Naturally,

selection effects present in the population of all known clusters propagate to

the OCISM sample.

Statistical properties (distances, sizes, masses, distribution in the

Galaxy, etc.) of the clusters in the OCISM database were compared to the

properties of all known clusters (see, e.g., Lyng_ 1982) by Leisawitz (1985).

In most respects, OCISM clusters are representative of the sample of all well-

studied open clusters. However, old open clusters (~108 - 109 yr) and nearby

clusters (d _1 kpc) are, by fiat, underrepresented in the database; and clusters

in quadrants Ill and IV of galactic longitude are missing because of the

declination limit.

xii

SOURCES OF INFORMATION

A systematic survey of international astronomical literature was used to

locate information about the clusters. Journal articles cited in the

blbllographles of Alter, Ruprecht, and Vanysek (1970) and Ruprecht, Balazs, and

White (1981), as well as articles cited in the Astronomy and Astrophysics

Abstracts, were scanned manually. Most of the articles considered were

published more recently than the early 1960s and the survey is essentlally

complete through late 1987.

In its present form, the database contains information from approximately

400 reference sources. Some sources are particularly valuable because they

contain self-conslstently evaluated descriptions of numerous clusters.

Information from the surveys listed in Table 2 is heavily represented in the

OCISM database.

DATABASE CONTENTS AND CATALOG FORMAT

The Catalog of Open Clusters and Associated Interstellar Matter was

formatted by the processing software created to operate on the OCISM database.

Information for each of the 128 OCISM clusters is presented on two pages. Every

datum in the catalog is presented with a "reference code." A short,

alphabetized table of references is displayed with the data for each cluster (a

comprehensive reference llst can be found at the back of this document). The

clusters are catalogued in order of ascending galactic longitude. The data

flelds are described below.

Cluster Identification

The OCISM database can facilitate research related to the interstellar

matter associated with young star clusters, an interdisciplinary endeavor, by

linking the various names by which a cluster and the interstellar gas in its

environment are referred. Molecular cloud observers, for example, relate their

discoveries to stellar associations or to well-known H II regions, but seldom to

the individual visible clusters of stars to which their clouds recently gave

birth. Optical observers are vulnerable to being uninformed that the reddening

that they measure photometrically sometimes is produced by dust in a known

foreground molecular or atomic hydrogen cloud. Observers of interstellar

clouds, in turn, may benefit by having constraints placed on the clouds'

distances.

xiii

Table 2. Open Cluster and Related Interstellar Matter Surveys

Reference Principal Contrlbutlons a

Johnson e._tal. (1961)

Johnson and Svolopoulos (1961)

Becket (1963)

Schmldt (1963)

Hoag and Applequist (1965)

Courtes, Cruvelller, and

Georgelln (1966)

Gordon, Howard, and Westerhout (1968)

Lindoff (1968)

D'Odorlco and Felli (1970)

Hagen (1970)

Becket and Fenkart (1971)

Reddish and Sloan (1971)

van Schewlck (1971)

Schwartz (1971)

Georgelln and coworkers (1970,

1973, 1975, 1976)

Harris (1976)

Fenkart and Binggell (1979)

Moffat and coworkers (1971, 1972,

1973_ 1974, 1975, 1979)

Israel (1977, 1978, 1980)

Mermilliod (1981a, b)

Nicolet (1981)

Blitz, Fich, and Stark (1982)

d, E(B-V), (B-V)t, eSpT

RV(*)

d, E(B-V), AV, eSpT

M(*)

d, eSpT

RV(H IX)

RV(H I), M(H I)

cluster age

M(dust)

d, AD, E(B-V), RV(*)

d_ AD, LD, E(B-V), AV, eSpT

M(*)

cluster proper motion

M(H II)

RV(H II), eSpT

cluster age

d, eSpT

d, AD, E(B-V), eSpT

M(H IX)

cluster age

d, E(B-V)

RV(H 2)

xiv

Table 2. (continued)

Reference Principal Contrlbutlons a

Janes and Adler (1982)

Bruch and Sanders (1983)

Wramdemark (1983)

Lynga (1981, 1983, 1987)

Hron (1987)

Leisawitz, Thaddeus, and Bash (1988)

(B-V) t

M(*)

RV(*)

d, AD, LD, E(B-V), AV, age,

eSpT, (B-V)t , RV(*), M(*)

RV(*)

RV(H2), M(H 2)

a Abbreviations:

d = distance; AD = cluster angular diameter; LD fficluster linear diameter;

E(B-V) ffireddening; AV = vlsual extinction; eSpT = cluster member of

earliest main sequence spectral type (photometric or spectroscopic type);

(B-V)t = color of main sequence turnoff; RV = radial velocity; M = mass;

* = pertaining to cluster stars; H II ffipertaining to associated ionized

gas; H I = pertaining to associated or potentially associated atomic gas;

H 2 = pertaining to associated or potentially associated molecular gas.

XV

Essentially all known open clusters have been assigned "OCL" numbers in the

Catalog of Star Clusters and Associations (Alter, Ruprecht, and Vanysek 1970) or

in its supplement (Ruprecht, Balazs, and White 1981). Clusters with NGC or

Messier (M) numbers commonly are referred to by those numbers. Most young

clusters are members of OB associations.

Many of the clusters in the OCISM database ionize H II regions because they

contain 0 stars. Since the clusters are observed optically, the H II regions

are characterized by nebulosity which can be seen in the Palomar Observatory Sky

Survey and in the Parker, Gull, and Kirschner (1979) Emission Line Survey of the

Milky Way. Most of the nebulae were catalogued by Sharpless (1959) and have "S"

numbers. A handful of the H II regions are referred to by their Westerhout

(1958) radio source (W) numbers.

Spatial Coordinates

Galactic and equatorial coordinates of the nominal cluster centers are

tabulated. The galactic longitudes and latitudes are in units of degrees.

Hours and minutes of right ascension are shown, as are degrees and arcminutes of

declination. The equatorial coordinates are for epoch 1950.0.

Radial Velocities

Approximate coincidence of stellar and interstellar gas radial velocities

often is the only clue that an association may exist between a star cluster and

a particular parcel of interstellar material.

All radial velocities in the OCISM database are in the reference frame of

the Local Standard of Rest (LSR). Stellar radial velocities and, occasionally,

H II region velocities are published in the heliocentric reference frame. To

convert to the LSR reference frame, a standard solar motion of 20 km s -1 in the

direction (iii , bii ) = (5672, +22?8) was assumed.

• Stellar Clusters

The velocity dispersion among the stars in a typical open cluster is of the

order of I km s -I (see, e.g., Mathieu 1986) and, in principle, the cluster

velocity is the average of the individual stellar velocities. Because of zero-

point calibration uncertainties, intrinsically broad spectral lines in early-

type stars, contamination of measurements by binary orbital velocities, and the

fact that only a limited number of stars in open clusters have been observed

with sufficiently high spectral resolution, the radial velocities of most young

open clusters are known with an accuracy no better than *i0 km s -1 (Hron 1987).

xvi

A theoretical radial velocity which is the velocity that the cluster, at a

known distance, would have if it followed a circular orbit around the galactic

center, was calculated for each OCISM cluster using the rotation curve model of

Brand (1986). The dispersion of the differences between derived radial

velocities and measured velocities, when available, is approxlmately 14 km s -1

(cf. Brand 1986; Hron 1987). For a large number of clusters, the "circular

velocity" is practically as reliable an estimator of cluster radial velocity as

any existing observation. This unfortunate state of affairs will persist until

modern techniques and instruments are applied to measure the velocities of a

large number of young clusters.

Lyng_ (1987) and Hron (1987) incorporated in their catalogs the radial

velocities compiled in unpublished work by Wramdemark. Agreement among the

velocities credited to these sources therefore is not accidental.

• H II Regions

Radio and optical recombination lines provide information about the radial

velocities of H II regions. Recombination lines are intrinsically broad (a

typical FWHM linewidth is ~25 km s-l), but the centroid velocities can be

measured with an accuracy of the order of 1 km s -1 in the case of radio lines or

a few km s -1 in the case of optical lines.

Differences among reported H II region radial velocities measured using

radio recombination lines more often than not can be attributed to peculiar

motions of the ionized gas and the fact that different lines of sight are

observed (or that the observations are made with beam sizes that differ). For

example, significant deviations from the "mean H II region velocity" often occur

along lines of sight that contain molecular clouds. Whenever possible, the

velocity tabulated in the OCISM database is one that is supposed to characterize

the mean H II region velocity. In some cases, several distinct major emission

features are reported in an article! these individual features are tabulated

here if they are not too numerous.

• Molecular Cloudsl

The mean radial velocities of interstellar molecular clouds can be measured

with an uncertainty less than 1 Dun s -I. Molecular clouds are discovered and

studied most commonly with observations of the spectral llne emission from the

fundamental rotation transition of carbon monoxide (12CO) molecules. In most

cases, 12C0 spectral lines are the sources of tabulated "CO cloud" velocities.

In some cases, however, 13C0 or H2CO line velocities are catalogued.

xvii

Different molecular clouds that are potentially associated with the same

open cluster may have different radial velocities. Leisawitz, Thaddeus, and

Bash (1988) describe and systematically apply criteria to decide if a molecular

cloud is "associated" or "potentially associated" with a cluster. All major

emission components reported to have been contributed by associated or

potentially associated molecular clouds are recorded in the OCISM database. The

Blitz, Fich, and Stark (1982) catalog of CO radial velocities toward H II

regions also is frequently cited.

Pr.__per Motions

Absolute proper motions (#x and #y) of the clusters are tabulated, in units

of arcseconds per century. As is conventional, #x = #a c°s6 and #y = #6 for the

right ascension component of proper motion _= and the declination component _6"

Distance

Among the many factors that might motivate one to study the interstellar

matter associated with open clusters is the fact that, by astronomical

standards, the distances of these objects are well known. Thus, masses of

associated ionized, atomic, and molecular gas components and, for example,

infrared luminosities of interstellar clouds can be measured with

uncharacteristically small errors. The scatter among different authors'

determinations of a cluster's distance indicates that the mean external error in

distance for clusters in the OCISM database is ~15%; the corresponding

uncertainty in gas mass or dust luminosity is ~30%.

A large number of researchers have constructed from photometric data

dereddened color-magnitude diagrams (CMD) and, by the method of main sequence

fitting (i.e., comparison with a "calibrated" CMD), have derived distance

moduli. Absolute distance moduli, and cluster distances, generally are obtained

by assuming a standard selective extinction ratio (e.g., Av/E(B-V) = 3.0 or 3.1)

to determine the extinction.

The distances to some open clusters have been derived using the method of

spectroscopic parallax. Generally, distances derived in this way are not

tabulated because only a few stars in each cluster are spectroscopically

observed and, with poor statistics, the method is inferior to main sequence

fitting (see_ e.g., Hoag and Applequist 1965).

Many of the distances entered in the OCISM database are values that were

adopted, rather than determined, by the authors cited. For example, Neckel

(1967) adopted distances that were measured by Johnson et al. (1961).

.°.

XVIII

Angular Diameter

Rigorous determination of a star cluster's angular diameter can be made by

counting stars and calculating the radial distribution of stellar surface

density (see, e.g., Danilov, Matkin, and Pyl'skaya 1985 and references therein).

Such measurements suggest that clusters often have high density cores (or

nuclei) and relatively low density halos (or coronas). Thus, what is meant by

mthe cluster angular diameter" is somewhat ambiguous. When an author reports

measurements of core and halo diameters, both are entered in the OCISM database.

In most cases, cluster angular diameters are measured directly by inspection

of a photographic plate or print. The cluster size determined in this manner

may be investigator-dependent and may be a function of the limiting magnitude

wlth which the cluster was observed.

The print inspection method was employed by Lyng_, who estimated the nuclear

sizes of nearly all open clusters (Lyng_ 1981; 1983; 1987). Lyng_'s

measurements are valuable particularly because of their self-conslstency. His

cluster diameters are contained in the 0CISM database.

Linea_...._r Diameter

The llnear dlameter8 of well-scudled open clusters are known because their

distances and angular sizes have been measured. In addition to published

estimates of the linear diameters of clusters, the OCISM database includes a

value for the size of each cluster which is based on an adopted distance and

angular diameter. The distance adopted for this calculation is either the

average of two recently reported measurements or the average of all database

distance entries if the dispersion among the entries is small. The angular

diameters of Lyng_ were assumed.

Estimates have been published for the ages of a large number of open

clusters based on several methods, most of which are related. Two premlses

generally are implicit in age determinations: (1) the stars in a cluster form

coevally! and (2) the main sequence lifetime of the most massive unevolved

cluster member is an estimator of cluster age. There is no consensus among

researchers as to the validity of the first assumption (of. Dooml De Greve, and

de Loore 1985; Scahler 1985). For 8tudles of the interaction between clusters

and their surrounding Interstellar matter, however, chls may not be problematic

because the derived age will be a measure of the time elapsed since the

xix

formation of the most massive cluster stars and these are the stars that can be

assumed to dominate the interaction. Only upper limits can be derived for the

ages of clusters that are so young (_5 Myr) that they contain no evolved massive

stars. In some cases, however, ages of very young clusters have been estimated

by noting that low-mass stars have not yet reached the zero-age main sequence

and by comparing photometric data with theoretical pre-maln sequence isochrones

(see, e.g., Moffat 1972).

Not all authors who report information sufficient to calculate a cluster's

age also report the age implied by their observation. Typically what is

published is the (B-V) color of the main sequence turnoff in the (dereddened)

CMD, the corresponding "photometric spectral type," or the spectroscopically

determined type of the brightest and bluest star on the cluster's main sequence.

The information needed to interpret these parameters as measures of cluster age

can be found in numerous artlcles (e.g., Lindoff 1968_ Harris 1976_ Janes and

Adler 1982_ Lyng_ 1982_ Mermilllod and Maeder 1986).

Published numerical estimates of the ages of clusters are entered in the

OCISM database. Also included in the database are "earliest" main sequence

spectral types and main sequence turnoff colors (in magnitudes). Lower case

letters are used to designate photometrically determined stellar types and upper

case letters are used for true spectral classifications.

Masses

In principle, one could measure the mass of stars in a cluster and inventory

the masses of all interstellar matter components associated with the cluster to

determine the "efficiency" with which stars form from dense interstellar clouds.

What may well be an insurmountable barrier stands in the way of achieving this

objective: to measure star formation efficiency, one must account correctly for

all of the interstellar matter that participates in a cluster's formatlon_

obviously, material that has participated (or will participate) in the formation

of a significant additional stellar population must not be included in the

analysis. At the very least, however, it is possible, and therefore sensible,

to assemble the data needed to address this fundamental issue.

Considerable care is required to determine what components of molecular and

atomic material observed in the direction of a star cluster are indeed

associated with the cluster. On the other hand_ it is generally unambiguous

that ionized gas detected in the direction of a cluster with O star members is

associated with the cluster. Fortunately, clear signs of interaction between

H II regions and dense interstellar clouds, such as "bright rims" on the cloud

xx

surfaces, occasionally enable one to conclude with confidence that a particular

molecular cloud is associated with a cluster (see, e.g., Lelsawltz, Thaddeus,

and Bash 1988). More often, the only hint that a particular atomic or molecular

cloud is associated with a cluster is a near-colncldence of stellar and

interstellar radial velocities (see, e.g., Gordon, Howard, and Westerhout 1968).

Masses of ionized, atomic, and molecular gas components are derived with

some assumption made about the distance of the emitting material. Masses

reported in the OCISM database are the published masses; no adjustment has been

applied to "correct" these values to a common reference distance, even if the

distance assumed is discrepant with a cluster's distance.

• Stellar

The masses of large samples of clusters have been studied by Schmldt (1963),

Reddish and Sloan (1971), and Bruch and Sanders (1983). Reddish and Sloan

derived masses relative to the mass of Trumpler 1. The cluster masses credited

to them in the OCISM database were derived by us assuming that Trumpler 1 has a

mass of 63 M@ (Schmldt 1963)• Cluster masses quoted by Bruch and Sanders also

are based on the Reddish and Sloan relative masses. Bruch and Sanders derived a

new conversion factor for absolute mass which turned out to be close to the

Schmldt mass estimate for Trumpler I. Close agreement between the Reddish and

Sloan masses and the Bruch and Sanders masses shown in the catalog is therefore

fortuitous.

• Atomic Gas

Aside from the difficulty associated with determining that a cloud of atomic

hydrogen is physically related to an open cluster (see above), there is the

added complication that individual H I clouds, seen as features in the 21-cm

line profile, generally are difficult to disentangle from "background" emission•

Only Gordon, Howard, and Westerhout (1968) and Tovmassian e._ttal. (1973) have

published systematic studies of H I emission from the neighborhoods of open

clusters (Dr. Bahia, of Boston University, presently is observing H I emission

from regions around a number of OCISM clusters).

xxi

" Ionized Gas

Published estimates of the mass of gas ionized by a young open cluster that

are based on the flux from the entire H II region (or at least the bulk of it)

are recorded in the OCISM database. Most of these estimates come from

observations of radio continuum emission and thus are not affected by

extinction.

• Molecular Clouds

The dynamical timescale for the interaction of molecular clouds and open

clusters was first determined observationally by Bash, Green, and Peters (1977).

The interaction has since been investigated in greater detail by Leisawitz,

Thaddeus, and Bash (1988).

In the Leisawitz e=_ta._l.CO survey, a distinction was made between catalogued

molecular clouds that can be considered with confidence to be "associated" with

clusters, clouds that are "potentially associated," and clouds that can be

considered with confidence not to be associated. A single entry of data from

the Leisawitz e..tta._l.survey is made in the OCISM database when the molecular

clouds found in the region around a cluster are "potentially," but not

conclusively, associated with the cluster! when some of the clouds are

considered "associated,*' two entries are made, the second corresponding to

"associated" clouds only and the first corresponding to the "associated" and the

"potentially associated" clouds. The tabulated masses are sums of the masses of

the clouds in each category. Some regions that were observed by Leisawitz et

al. contained no CO emission considered to be even potentially associated with

the clusters.

Since many H II region neighborhoods have been mapped for CO emission by

millimeter wave observers, information about the masses of molecular clouds near

very young open clusters is plentiful. A few H II regions in particular have

recieved much attention, notably M 17 (NGC 6618) and W 3 (adjacent to IC 1805).

A plethora of excellent articles have been neglected, for no reason other than

to conserve space in the catalog, when the information they provide is

essentially redundant with data already entered. Generally an entry is not made

in the OCISM database for articles in which only a small portion of a molecular

cloud is discussed•

xxii

• Dust

In rare instances, a value has been published for the mass of dust

associated with an open cluster. D'Odorico and Felli (1970) conducted the only

systematic survey of this nature of which we are aware. Although the D'Odorico

and Felli masses are tabulated, it is important to note that, unlike the

database entries for the masses of interstellar gas components, these dust mass

estimates correspond only to dust concentrated in a relatively small region

around the stars.

A crude but reasonable approximation for the total mass of dust in the

extended cluster environment can be obtained by sunnning the masses of the

various associated interstellar gas components and dividing by i00 since the

"normal" interstellar gas-to-dust mass ratio is ~100 (see Savage and Mathis 1979

and references therein).

Visual Extinction

In a majority of cases, values published for the visual extinction of a

cluster are derived from a measurement of the (B-V) color excess (reddening)

with an assumed value of 3.1 or 3.0 for the ratio Av[E(B-V). Of course, the

true distance modulus of a cluster will be estimated incorrectly if the

selective extinction ratio assumed to obtain the extinction is not strictly

applicable to the line of sight to the cluster.

Reddening

The reddening of cluster stars by foreground dust is deduced from multi-

wavelength photometric studies of the clusters• Even when photometry in a

system other than UBV is discussed, it is conventional for an equivalent (B-V)

color excess to be provided (see, e.g., Nicolet 1981; Janes and Adler 1982).

It is not uncommon for an observer to report a finding of variable reddening

toward a young cluster. In other words, the cluster stars show excessive

scatter about the nominal main sequence relation in the color-color diagram

(e.g., [U-B] shown as a function of [B-V]). Variable extinction is an

indication of the presence of a foreground molecular or atomic cloud (which may

or may not be physically related to the cluster). What is most often published,

and what is tabulated in the catalog, is a value for the mean cluster reddening.

..°

XXIII

PROCESSING AND ANALYSIS SOFTWARE

The 0ClSM database is available on request from the NSSDC. It will be

distributed with supporting documentation and with processing and analysis

software coded in FORTRAN. The programs to operate on the database are menu-

driven and should be self-explanatory. The basic processing options are as

follows:

a) "change output device and/or format" - user can select output to file or to

terminal; complete or limited amounts of output can be requested;

b) "select clusters on which to operate" - all clusters or a specifiable

subset of the clusters in the database can be considered;

c) "type llst of selected clusters" - llst includes cluster coordinates and

aliases;

d) "print catalog of cluster information" - in standard output format, this

prints the database catalog as it appears on the following pages; a less

voluminous output is generated if requested with option (a);

e) "mask out some references" - enables consideration of a subset of database

entries selected either according to how currently articles were written or

to specifiable article or compilation names (one might wish, for example,

to examine database entries from the compilations of Lyng_); to generate a

complete table of reference codes and corresponding references, send output

to a file and select option (h) (see below); ask the program for a more

detailed explanation and it will tell you the "maskin_ rules";

f) "average unmasked data and tabulate" - produces table showing average value

of a database parameter (e.g., distance) for each of the selected clusters;

table includes standard deviation and number of database entries averaged

(only entries that were not masked with option (e) are averaged);

g) "restore database" - necessary after masking either to mask differently or

to proceed with no masking;

h) "type complete llst of database references" - bibliography of all

references cited wlth corresponding reference codes (132 column output

field); codes are used to identify individual articles for "masking."

xxiv

Acknowledgments

I am grateful to Dr. Gosta Lyng_ who, long ago, encouraged me to pursue this

compilation. His own Catalog of Open Cluster Data provided great inspiration as

well as a wealth of information. I thank Dr. Wayne Warren for agreeing to

incorporate the OCISM database in the NSSDC archives and to provide the support

needed to distribute the database. The database was updated and prepared for

presentation while I was supported first as a National Research Council Resident

Research Associate at NASA_GSFC and later by a grant from the NASA Space

Astrophysics Data Analysis Program (SADAP proposal R033-87).

XXV

CATALOG OF OPEN CLUSTERS AND ASSOCIATED INTERSTELLAR MATTER

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_rU.S. GOVIERNIvlENT PRINTINGOFFICE: 7.9 Be. 526- 06_8600_

270

NatiOnal Aeronaut,s andSpace Adn_nlstratlon

1. Report No.

NASA RP-1202

4. Title and Subtitle

Report Documentation Page

2. Government Accession No. 3. Recipient's Catalog No.

5. Report Date

June 1988

Catalog of Open Clusters and Associated InterstellarMatter

7. Author(s)

David Leisawitz

9. Performing Organization Name and Address

Goddard Space Flight CenterGreenbelt, Maryland 20771

12. Sponsoring Agency Name and Address

National Aeronautics and Space Administration

Washington, D .C. 20546-0001

6. Performing Organization Code

680

8. Performing Organization Report No.

88B0152

10. Work Unit No.

11. Contract or Grant No.

13. Type of Report and Period Covered

Reference Publicat ion

14. Sponsoring Agency Code

15. Supplementary Notes

16. Abstract

The Catalog of Open Clusters and Associated Interstellar Matter stmmm_izes

observations of 128 open clusters and their associated ionized, atemic, andmolecular interstellar matter. Cluster sizes, distances, radial velocities,ages, and masses, and the radial velocities and masses of associated inter-stellar medium components, are given. The database contains information fremapproximately 400 reference sources published in the scientific literaturebefore 1988.

17. Key Words (Suggested by Author(s))

Open ClustersInterstellar Matter

Astron_ny Database

19. Security Classif. (of this report)

Unclassified

NASA FORM 1(126 OCT 86

18. Distribution Statement

Uncl ass ified-Unl imit ed

20. Security Classif. (of this page)

Unclassified

Subject Category 90

21. No. of pages

300

22. Price

A13


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