ASTRONOMICAL SOCIETY OF THE PACIFICCONFERENCE SERIES
Volume 334
14T H EUROPEAN WORKSHOP ON WHITE DWARFS
Proceedings of a workshop held inKiel, Germany19-23 July 2004
Edited by
D. KoesterInstitutfur Theoretische Physik und Astrophysik
Universitdt Kiel, 24098 Kiel, Germany
and
S. MoehlerInstitutfur Theoretische Physik und Astrophysik
Universitdt Kiel, 24098 Kiel, Germany
Contents
Preface xvi
Participants xvii
Conference Photograph .< xxvii
Part 1. White Dwarf Structure, Evolution, and Galactic Distribution
The White Dwarf Luminosity Function: The Shape of Things toCome 4. 3T. von Hippel, M. Kilic, J. A. Munn, H. HC. arris, K. A. Williams,J. Liebert, D. E. Winget, T. S. Metcalfe, H. L. Shipman, M. A. Wood,T. D. Oswalt, S. J. Kleinman, and A. Nitta
Initial Results From the Lick-Arizona White Dwarf Survey . . 8
K. A. Williams and M. BolteSpectroscopy of Faint White Dwarfs - The DA/DB Ratio
and the Initial-Final Mass Relation 9J. S. Kalirai, H. B. Richer, D. Reitzel, B. M. S. Hansen, R. M. Rich,G. G. Fahlman, B. K. Gibson, and T. von Hippel
On Supermassive White Dwarfs \.. . . . 15
V. WeidemannFaint Blue Objects in the Hubble Deep Field North . 21
M. Kilic, T. von Hippel, R. A. Mendez, and D. E. Winget
A Detailed Photometric Analysis of Halo White DwarfCandidates 27P. Bergeron, M.-T. Ruiz, M. Hamuy, S. K. Leggett, M. J. Currie,C.-P. Lajoie, and P. Dufour
Prospects for Observing White Dwarfs with SIM: the SpaceInterferometry Mission 33H. L. Shipman and J. L. Provencal
Estimating White Dwarf Luminosity Functions 37E. Garcia-Berro, E.M. Geijo, S. Torres, and J. Isern
White Dwarfs and Metal Abundances 43J. Isern, E. Garcia-Berro, I. Domiguez, M. SaJaris, and O. Straniero
v
vi Contents
Carbon in Hot DB White Dwarfs: A New Challenge for theTheory of the Spectral Evolution of White Dwarfs 49
G. Fontaine and P. Brassard
White Dwarfs in LJ Centauri: Preliminary Evidence 55G. Bono, M. Monelli, P. B. Stetson, P. G. Prada Moroni, R. Buonanno, 'A. Calamida, I. Ferraro, G. Iannicola, C. E. Corsi, and L. Pulone
Formation and Evolution of Hydrogen-Deficient post-AGBWhite Dwarfs 61L. Althaus, J. Panei, A. Corsico, E. Garcia-Berro, and C. Scoccola
Determination of a Modern Equation of State for theLiquid/Solid Core of White Dwarf Stars 65A. Kitsikis, G. Fontaine, and P. Brassard
White Dwarf Cooling by Means of Heat Waves 69N. Falcon
Successors of White Dwarfs - Blue Hook Stars and the Late HotFlasher Scenario 73S. Moehler, A. V. Sweigart, W. B. Landsman, N. J. Hammer, andS. Dreizler
White Dwarfs in Open Clusters: Calibrating the Clock 77T. von Hippel, D. E. Winget, W. H. Jefferys, and J. G. Scott
3D-Kinematics of White Dwarfs from the SPY-Project 81E.-M. Pauli, U. Heber, R. Napiwotzki, M. Altmann, and M. Odenkirchen
Spatially Varying IMFs and Halo White Dwarfs 85S. Torres, E. Garcia-Berro, and J. Isern
Mass Determination of DA White Dwarfs from the SloanDigital Sky Survey 89O. Giovannini, A. F. M. da Costa, B. G. Castanheira, and S. O. Kepler
A Model of the Local WD Population 93K.-P. Schroder, R. Napiwotzki, and E.-M. Pauli \
Part 2. Large Surveys
Doubling the Number of White Dwarf Stars: The First SDSSWhite Dwarf Catalog 99
S. J. Kleinman
New High-Proper Motion White Dwarfs in the NLTTCatalog and Sloan Digital Sky Survey 101A. Kawka and S. Venues
Masses, Radii, and Bolometric Luminosities of DA WhiteDwarfs in the First Data Release of the Sloan DigitalSky Survey 107M. Nalezyty, J. Madej, and L. G. Althaus
Contents vii
Cool White Dwarfs from the SuperCOSMOS and Sloan DigitalSky Surveys 113N. C. Hambly, A. P. Digby, and B. R. Oppenheimer
The Use and the Efficiency of the DDO51 Filter for
Identification of Cool White Dwarfs 119
M. Kilic, D. E. Winget, T. von Hippel, and C. F. Claver
How Many Hot Subdwarf Stars Were Rejected from the PGSurvey? 123R. A. Wade, M. A. Stark, and R. F. Green
Sloan Digital Sky Survey: Proper Motion Systems ContainingWhite Dwarfs 127J. A. Smith, N. M. Silvestri, T. D. Oswalt, H. C. Harris, S. J. Kleinman,J. A. Munn, A. Nitta, and M. A. Rudkin
Discovery of 282 Cool White Dwarfs (Tef[ <̂ 8000 K) in theSloan Digital Sky Survey 131M. Kilic, J. A. Munn, H. C. Harris, J. Liebert, T. von Hippel,K. A. Williams, T. S. Metcalfe, and D. E. Winget
The GSC2 Survey of Cool White Dwarfs 135D. Carollo, A. Spagna, M. G. Lattanzi, R.L. Smart, B. Bucciarelli,L. Terranegra, S. T. Hodgkin, and B. McLean
4
Analysis of DA White Dwarfs from the McCook & Sion Catalog 139A. Gianninas, P: Bergeron, and P. Dufour
Searching for White and Brown Dwarfs in the Frame of theMUSYC/CYDER Survey 143M. Altmann, R. A. Mendez, M.-T. Ruiz, W. van Altena, E. Gawiser,J. Maza, and P. van Dokkum
White Dwarfs in the ALHAMBRA Survey 147S. CataMn, J. Isern, E. Garcia-Berro, S. Torres, and the ALHAMBRATeam >
Part 3. Atmospheres, Abundances, Magnetic Fields
Fossil Fields in Magnetic White Dwarfs 153D. T. Wickramasinghe and L. Ferrario
K i l o - G a u s s M a g n e t i c F i e l d s i n T h r e e D A W h i t e D w a r f s . . . . 1 5 9R. Aznar Cuadrado, S. Jordan, R. Napiwotzki, H. M. Schmid,S. K. Solanki, and G. Mathys
On Possible Oxygen/Neon White Dwarfs: H1504+65 and theWhite Dwarf Donors in Ultracompact X-ray Binaries . . 165
K. Werner, JV. J. Hammer, T. Nagel, T. Rauch, and S. Dreizler
Twenty Years of Studies on H1504+65 171
M. S. Sliwinski and L.I. Sliwinska
viii Contents
HST Observations of the Sirius B Baimer Lines 175M. A. Barstow, M. R. Burleigh, J. B. Holberg, I. Hubeny, H. E. Bond,and D. Koester
Is the Distribution of Nitrogen in the Atmospheres of Hot DAWhite Dwarfs Inhomogeneous? 181
P. Chayer, S. Venues, and J. Dupuis
Lyman Line Spectroscopy of Hot Hydrogen-Rich White DwarfsRevisited 185
S. Vennes, P. Chayer, J. Dupuis, and T. Lanz
Results from a FUSE Survey of Hot White Dwarfs 191J. Dupuis, P. Chayer, S. Vennes, J. W. Kruk, L. M. Torres, andP. J. Sanchez
Detailed Spectroscopic and Photometric Analysis of DQ WhiteDwarfs 197
P. Dufour, P. Bergeron, and G. Fontaine
Non-Ideal Equation of State, Refraction and Opacities in VeryCool, Helium-Rich White Dwarf Atmospheres 203
P. M. Kowalski, D. Saumon, and S. Mazevet
Modelling Alkali Line Absorption and Molecular Bands in CoolDAZs - 209D. Homeier, N. Allard, F. Allard, P. H. Hauschildt, A. Schweitzer,P. C. Stencil, and P. F. Week
DAZ White Dwarfs in the SPY Sample 215D. Koester, K. Rollenhagen, R. Napiwotzki, B. Voss, N. Christlieb,D. Homeier, and D. Reimers
Identification of a DO White Dwarf and a PG1159 Star in theESO SN la Progenitor Survey (SPY) 221K. Werner, T. Rauch, R. Napiwotzki, N. Christlieb, D. Reimers, andC.A. Karl
FUSE spectroscopy of PG 1159 Stars )• 225
E. Reiff, T. Rauch, K. Werner, and J. W. Kruk
Deposing the Cool Corona of KPD 0005+5106 229
K. Werner and J. J. Drake
Spectral Analyses of DO White Dwarfs and PG1159 Stars fromthe Sloan Digital Sky Survey 233S. D. Hiigelmeyer, S. Dreizler, K. Werner, A. Nitta, S. J. Kleinman, andJ. Krzesinski
Metal Abundances in Hot DA White Dwarfs 237
S. Schuh, M. A. Barstow, and S. Dreizler
Rotation Velocities of DA White Dwarfs with ConvectiveAtmospheres 241C. Karl, U. Heber, R. Napiwotzki, S. Dreizler, D. Koester, and I. N. Reid
Contents ix
The Discovery of Oxygen Rich Chromospheres in Two MassiveDQ White Dwarfs 245
J. L. Provencal, H. L. Shipman, and J. MacDonald
Comparison of White Dwarf Mass Determinations 249
S. Boudreault and P. Bergeron
Model Atmospheres for Hot Evolved Stars: Revising the
Treatment of Continuous Opacities 253
JV. Behara and C. S. Jeffery
Discovery of Magnetic Fields in CPNs 257
S. Jordan, K. Werner, and S. J. O'Toole
Discovery of Magnetic Fields in Hot Subdwarfs 261
S. J. O'Toole, S. Jordan, S. Friedrich, and UHeber
Constraining Gravitational Theories by Observing MagneticWhite Dwarfs 265
O. Preuss, S. Jordan, M. P. Haugan, and S. K. Solanki
Surface Magnetic Field Distributions of the White Dwarfs PG1015+014 and HE 1045-0908 269
F. Euchner, S. Jordan, K. Reinsch, K. Beuermann, and B. T. Gansicke
Do Magnetic Fields Prevent Hydrogen from Accreting onto CoolMetal-line White Dwarf Stars? 273
S. Friedrich, S. Jordan, and D. Koester
Heterogeneous Magnetospheres of Accretion-Induced Collapsing
White Dwarfs 277
V. Kryvdyk and A. Agapitov
Magnetic Fields and Rotation of Compact Stars 281
L. Ferrario and D. T. Wickramasinghe
I r r a d i a t i o n E f f e c t s i n C l o s e D e g e n e r a t e B i n a r y S y s t e m s , . . . . 2 8 5
T. Palma and R. D. Rohrmann
Part 4. White Dwarf Progenitors: CSPNe, SDBs, SDOs
Spectroscopic Analyses of Helium-rich Subdwarf B Stars . .'••. . 291
A. Ahmad and C. S. Jeffery
The Upward Diffusion of Hydrogen in Helium-Rich SubdwarfB Stars 297
K. Unglaub
Subdwarf B Stars from the ESO Supernova la ProgenitorSurvey - Observation versus Theory 303T. Lisker, U. Heber, R. Napiwotzki, N. Christlieb, Z. Han, D. Homeier,and D. Reimers
x Contents
Subluminous O Stars from the ESO Supernova ProgenitorSurvey - Observation versus Theory 309
A. Stroer, U. Heber, T. Lisker, R. Napiwotzki, and S. Dreizler
Metal Abundances in sdBs from UV Spectroscopy 315S. J. O'Toole
Iron Abundance in Hydrogen-Rich CentralStars of Planetary Nebulae 321A. I. D. Hoffmann, I. Traulsen, T. Rauch, K. Werner, S. Dreizler, andJ. W. Kruk
HST and FUSE Spectroscopy of Hot Hydrogen-Rich CentralStars of Planetary Nebulae 325I. Traulsen, A. I. D. Hoffmann, T. Rauch, K. Werner, S. Dreizler, andJ. W. Kruk
Spectral Analysis of Central Stars of PNe Interacting with theInterstellar Medium 329
T. Rauch and F. KerberSubdwarf B Binaries from the Edinburgh-Cape Survey 333
L. Morales-Rueda, P. F. L. Maxted, T. R. Marsh, D. Kilkenny, andD. O'Donoghue
Mass-Loss and Multicomponent Flow from Central Stars ofPlanetary Nebulae . < 337
J. Krticka and J. KubatHydrogen-Deficient Stars in Pre-WD Stages 341
W.-R. Hamann and G. GrafenerLMC-N66: A Potential SN la Progenitor? 345
W.-R. Hamann, M. Pena, and G. Grafener
Part 5. White Dwarf and Progenitors in Binaries
Subdwarf B Binaries as an Important Progenitor Channel forCataclysmic Variables 351
K. SchenkerThe Mass of the sdB Primary of the Binary HS 2333+3927 . 357
U. Heber, H. Drechsel, C. Karl, R. Qstensen, S. Folkes, R. Napiwotzki,M. Altmann, O. Cordes, J.-E. Solheim, B. Voss and D. Koester
The Secondary Companions in Short-Period sdB Binaries . . . 363
E. M. Green, B.-Q. For, and E. A. Hyde
Subdwarf B Binaries from the SPY Project 369C. Karl, U. Heber, and R. Napiwotzki
New Results from the Supernova la Progenitor Survey 375R. Napiwotzki, C. A. Karl, G. Nelemans, L. Yungelson, N. Christlieb,H. Drechsel, U. Heber, D. Homeier, D. Koester, J. Kruk, B. Leibundgut,T. R. Marsh, S. Moehler, A. Renzini, and D. Reimers X
Contents xi
Observations of Ultra-short Period Double-degenerate WDBinary Candidates 381
K. Reinsch
The White Dwarfs in AM CVn Systems - Candidates for SNla? 387J.-E. Solheim and L. R. Yungelson
Ultraviolet Observations of the Young Pre-IP CandidateHS1136+6646 393D. K. Sing, J. B. Holberg, S. Howell, M. Burleigh, S. Good, andM. Barstow
Two Ultracool Degenerate Companions 398
J. Farihi
NLTE Analysis of the Ultra-short Period White-Dwarf BinaryRX J0806.3+1527 T 399J. Steiper, K. Reinsch, and S. Dreizler
The Solution of the Radiative Transfer Equation in AccretionDiscs of Cataclysmic Variables 403
D. Korcakova, J. Kubat, and A. Kawka
A Search for Unresolved Double Degenerates Using IUE Archives 407C.-P. Lajoie and P. Bergeron"
C a n W h i t e D w a r f s i n I n t e r m e d i a t e P o l a r s b e U n v e i l e d ? . . . . 4 1 1D. de Martino, M. Mouchet, J.-M. Bonnet-Bidaud, B. T. Gansicke, andF. Haberl
Spectropolarimetry of Magnetic Cataclysmic Variables and WhiteDwarfs with the SALT 415D. A. H. Buckley, D. O'Donoghue, S. B. Potter, and K. H. Nordsieck
Finding the Cool Companions of the PG DA White Dwarfs . 419J. B. Holberg and K. Magargal
Spectral Analysis of Super Soft X-ray Sources: V4743 Sagittarii 423T. Rauch, M. Orio, R. Gonzales-Riestra, and M. Still
Mixed Hydrogen-Helium White Dwarfs in Short Period X-rayBinaries : 427A. M. Teodorescu, F. D'Antona, and P. Ventura
A NICMOS Direct Imaging Search for Giant Planets around theSingle White Dwarfs in the Hyades 431S. Friedrich, H. Zinnecker, W. Brandner, S. Correia, andM. McCaughrean
Resolving sdB Binary Systems with Adaptive Optics 435
R. 0stensen, U. Heber, and P. Maxted
Disentangling Composite Spectrum Hot Subdwarfs 439
M. A. Stark and R. A. Wade
xii Contents
SDSS J1240-01: A New AM CVn Star with a 37-MinuteOrbital Period 443G. H. A. Roelofs, P. J. Groot, T. R. Marsh, D. Steeghs, and G. Nelemans
Spin- Up and Spin-Down of Magnetic White Dwarfs inCataclysmic Variables: Theory vs Long-Term Monitoring 447
I. L. Andronov
Part 6. Variable White Dwarfs and Progenitors
Non-Radial Oscillations in CV Primaries 453
B. Warner and P. A. Woudt
Questioning the Purity of the ZZ Ceti Instability Strip 459A. S. Mukadam, D. E. Winget, T. von Hippel, M. H. Montgomery,S. O. Kepler, and A. F. M. Costa
The Crystal Method: Asteroseismology of BPM 37093 465
T. S. Metcalfe, M. H. Montgomery, and A. Kanaan
Time-Series Spectroscopy of DAVs 471S. E. Thompson, J. C. Clemens, and D. Koester
Whole Earth Telescope Observations of the ZZ Ceti StarHLTau76 477G. Vaudair et aJ. (the WET collaboration)
White Dwarf Lightcurves: Constraining Convection and ModeIdentification Using Non-sinusoidal Lightcurves 483M. H. Montgomery
Exploring Uncharted Territory in Particle Physics UsingPulsating White Dwarfs: Prospects 489A. Kim, D. E. Winget, M. H. Montgomery, and D. J. Sullivan •
EC 20058-5234: A DBV White Dwarf and a Possible PlasmonNeutrino Detector 495
D. J. Sullivan
Measuring Evolutionary Rates 501S. O. Kepler, J. E. S. Costa, A. Mukadam, F. Mullally, D. E. Winget,R. E. Nather, and D. Sullivan
Distances to Selected Variable White Dwarf Stars 506
F. Mullally and M. de Graff
I n v e s t i g a t i o n o f t h e S p e c t r a l V a r i a b i l i t y o f P G 1 1 5 9 - 0 3 5 . . . . 5 1 2
S. Dreizler, K. Werner, and T. Stann
The Domains of Instability for the Pulsating PG 1159 Stars . 518P.-O. Quirion, G. Fontaine, P. Brassard, and F. Herwig
Contents xiii
High Sensitivity Observations and Detailed AsteroseismologicalAnalysis of the EC14026 Star Feige 48 524
S. Charpinet, G. Fontaine, P. Brassard, M. Billeres, E. M. Green, andP. Chayer
Discovery of a Long-Period Photometric Variation in theV361Hya Star HS 0702+6043 530S. Schuh, J. Huber, E. M. Green, S. J. O'Toole, S. Dreizler, U. Heber,and G. Fontaine
Mode Identification in Pulsating sdB Stars from ULTRACAM
Observations 536
C. S Jeffery, V. S. Dhillon, T. R. Marsh, and B. Ramachandran
The Effects of Crystallization on the Pulsational Properties of
Massive ZZ Ceti Stars 537
A. H. Corsico, L. G. Althaus, M. H. Montgomery, and E. Garcia-Berro
High Speed Photometry of White Dwarfs with Small Telescopes 541
J. L. Provencal, H. L. Shipman, D. Childers, and A. Nitta
T h e S p e c t r a l V a r i a b i l i t y of P u l s a t i n g S t a r s : P G 1 1 5 9 - 0 3 5 . . . 5 4 5
T. Stain, S. Dreizler, and K. Werner
HST Observations of the Pulsating White Dwarf GD 358 . . . 549
B. G. Castanheira, S. O. Kepler, A. Nitta, D. E. Winget, and D. Koester
The Vibrating String Analogy and Mode Trapping 553
M. H. Montgomery
Revisiting the DBs Instability Strip Using UV Spectra 557
B. G. Castanheira, S. O. Kepler, D. Koester, and G. Handler
Analysis of HST and IUE Data of the DBV Star PG1351+489 561
V. M. Alves, J. E. S. Costa, S. O. Kepler, and D. Koester
Asteroseismology of the Crystallized ZZ Ceti Star BPM 37093:A Different View (Part II) 565
G. Fontaine and P. Brassard \T h e P u l s a t i n g D A W h i t e D w a r f S t a r E C 1 4 0 1 2 - 1 4 4 6 . : . . . . 5 6 9
G. Handler and E. Romero-ColmeneroConstraints on the Structure of HL Tau 76 Derived from
Asteroseismology 573
D. Pech, G. Vaudair, and N: Dolez
Asteroseismic Results for GD 154 • • 577
D. 6. Hiirkal, G. Handler, B. A. Steininger, and M. D. Reed
Eleven New DAVs from the Sloan Survey 581F. Mullally, S. E. Thompson, B. G. Castanheira, D. E. Winget,S. O. Kepler, D. J. Eisenstein, S. J. Kleinman, and A. Nitta
New DBVs from the SDSS 585A. Nitta, S. J. Kleinman, J. Krzesinski, A. S. Mukadam, F. Mullally,R. E. Nather, D. J. Sullivan, S. E. Thompson, D. E. Winget, andM. A. Wood
xiv Contents
Search for IR Excess in White Dwarf Stars 589A. Nitta, J. L. Provencal, M. Kilic, S. J. Kleinman, J. Liebert, andT. von Hippel
A Convective Model for Light Curves of ZZ Ceti Stars 593
N. Falcon •
White Dwarf Observations in Hungary 597
M. Papard, R. Szabo, and Z. Csubry
Analysis of a Sample of Candidate DAV Stars 601
B. Voss and D. KoesterProgress Report on the Search for Variability Among Cool White
Dwarfs 605
T. D. Oswalt, M. Rudkin, K. Johnston, J. Kissinger, and K. Menezes
Pulsating Subdwarf B Stars in Close Binaries 607
M. D. Reed and B. J. Brondel
New Observations of the Hot PNNV Sanduleak 3 611B. Steininger, M. Pretorius, M. Breger, and R. R. Shobbrook
Fundamental Parameters of the sdB Pulsator PG 1219+534'-The Importance of High Sensitivity Observations forDetailed Asteroseismology of EC 14026 Stars 615
S. Charpinet, G. Fontaine, P. Brassard, E. M. Green, and P. Chayer
The Asteroseismic Analysis of the EC14O26 Star PG 0014+067Revisited 619S. Charpinet, G. Fontaine, P. Brassard, M. Billeres, E. M. Green, andP. Chayer
PB8783 Revisited 623
M. VucJcovic, S. Hostler, S. D. Kawaler, and B. Behera
Searching for Pulsations among sdOs 627C. Rodriguez-Lopez, A. Ulla, R. Garrido, M. Manteiga, V. Casanova,A. Sota, R. 0stensen, and R. Oreiro
Balloon09010001: Towards the White Dwarf Stage? 631R. Oreiro, A. Ulla, F. Perez, Hernandez, J. MacDonald, R. 0stensen, andC. Rodriguez Lopez
An Asteroseismological Analysis of the Short-Period PulsatingsdB star EC 05217-3914 635
M. Billeres and G. Fontaine
A New Computer Code for Analyzing the Light Curves ofEclipsing Pre-Cataclysmic Binaries (PCBs): Applicationto UU Sge and V477 Lyr 639
V.-V. Pustynski and I. Pustylnik
Photometric Variability in the Faint Sky Variability Survey . . 643L. Moraies-Rueda, P. J. Groot, T. Augusteijn, G. Nelemans,P. M. Vreeswijk, and E. J. M. van den Besselaar
Contents xv
Detection of Pulsations in the Newly Discovered PGil59 StarHE 1429-1209 647T. JVagei and K. Werner
Two New ZZ Ceti Pulsators from the HS and HE Surveys . . 651R. Silvotti, B. Voss, D. Koester, and I. Bruni
Analysis of High Resolution White Dwarf Spectra from the ESOSNIa Progenitor Survey (SPY) 655B. Voss, D. Koester, and the SPY consortium
ACF Analysis of Irregularly Spaced Observations of theAccretion Structures near White Dwarfs 659
I. L. Andronov and L. L. Chinarova
Author Index .^. 663