Processing Status

June 2009

Mar

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Talk OutlineM

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•Archive status

•Data flow

•New Status Reports

•Zero-points

•FP3

•Stellar parameters: temperatures

Archive statusM

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As of 9th June 2009

•285,503 spectra

•Last date in internal and reduced archives: 20090328

•Last date in raw archive: 20090328

Sky Coverage M

ary

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First year data

25,689 RVs, ~4,500 deg2

Sky Coverage M

ary

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Second year data

26,906 RVs, ~5,000 deg2

Sky Coverage M

ary

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Third year data

37,292 RVs, ~8,800 deg2

Sky Coverage M

ary

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Fourth year data

87,261 RVs, ~17,200 deg2

Sky Coverage M

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Fifth year data

41,002 RVs, ~11,000 deg2

Sky Coverage M

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Sixth year data

59,945 RVs, ~11,000 deg2

Sky Coverage M

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Full database

218,100 RVs, ~32,000 deg2

Current data flow M

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SSO AAO

(Warren)

PadovaReduction

(Alessandro)

AIP Archive

AIP Pipeline(Mary)

AIPProcessed

Data Archive

Problem fields

Fortnightly 3-4 days

Internal release(at AIP)

Reduction problem fields

Fortnightly

Weekly

Eyeballing of spectra(Rachel, Tomaz, Gal, Paola)

Complete to Dec 2007

1/2 weekIrregular

AIP archive

Last release complete to March 2009

New status reportsM

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New status reportsM

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New status reportsM

ary

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New status reportsM

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New status reportsM

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Zero-pointsM

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What are they?•Temperature fluctuations cause shift in wavelength between science frames and arc frames•Mostly of the order of a 1-5 km/s•We correct with zero-point RVcorrection•ZeroPointQualityFLAG denotes quality of zero-point correction - mostly!!

Zero-pointsM

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How do we calculate the correction?

Un-sky subtracted spectra

from single fibreSky template

SkyRV, eSkyRV, R for single fibre

THEN….

Zero-pointsM

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THEN we do a polynomial fit across the field

SkyRV and eSkyRVExclusive

sky fibre

(weight=5xR)

Weight by R value

Threshold of R=5 The fit gives RVcorrection

ZeroPointQualityFLAG gives the quality of the fit•1st character: FIELD fit quality

Dispersion between SkyRV - RVcorrection

•2nd character: Sub-group fit quality

Dispersion between SkyRV - Rvcorrection for

regions 1-50, 51-100, 101-150•*: If interval between usable sky velocities > 15

Zero-pointsM

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Zero-pointsM

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The fit can sometimes be very bad…

Fiorangela La Forgia

It can become unbound if there are insufficient fibres with R>5

Zero-pointsM

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Sometimes bad zero-points are hard to spot

•X-correlation with sky has |50| km/s limit•If outside those bounds

SkyRV=0, eSkyRV=0 or large, R<0.1•The RVs for such spectra can be wrong by as much as 100 km/s! •Affects small number of fields•These data are removed from the database

Zero-pointsM

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The other bad fits are hand corrected•All zero-points fits are eyeballed•Those with unbound fits are manually corrected•New flagging of affected spectra:

ZeroPointQualityFLAG=‘M’ •However, there has been an increase in problem fields…

Fiorangela La Forgia

Zero-pointsM

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There were a number of causes of this increase•Shift to brighter stars, lower exposure time

Exposure times increased back again•Poor placement of sky fibres

More care taken•Deterioration of fibres meaning lower S/N

FP3

There is a backlog of correcting these fits

manually•Be wary if |RVcorrection| > 10 km/s or *!•If find some high RV stars, check fellow fibres

Zero-pointsM

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Correlation between RV and SkyRV•Caused by underlying stellar spectrum “tugging” on

sky correlation

•Not a problem for zero point calibration IF there is

no mean offset in stellar RVs for one field…BUT…

Zero-pointsM

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There might be such a issue

•Whole fields have have a non-zero mean RV •Causes shift in Rvcorrectionof the order of a coupleof kms-1

•Work in progress

Field Plate 3M

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The first 8 FP3 fields•New stiffer cabling used - potential problems!•Check stability of SkyRV

Grey : R < 5Black: R > 5

Field Plate 3M

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Stability of SkyRV for R > 5•FP3: (SkyRV)=-0.5 kms-1, (SkyRV)=1.9 kms-1

•FP1: (SkyRV)=-0.4 kms-1, (SkyRV)=2.9 kms-1

•FP2: (SkyRV)=-0.4 kms-1, (SkyRV)=2.2 kms-1

Field Plate 3M

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Some of the fields include repeat observations

All but one field look good

Field Plate 3M

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The problem field was one of the earlier ones

So ignoring this field and |RV(FP3) - RV(previous)| < 20 kms-1

Field Plate 3M

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Stability of SkyRV for R > 5•FP3: (RP3 RV-previous RV)=-0.5 kms-1

68.2%: =1.1 kms-1 95%: =2.3 kms-1

•ALL: (RP3 RV-previous RV)=+0.2 kms-1

68.2%: =1.4 kms-1 95%: =3.8 kms-1

Stellar ParametersM

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Comparing RAVE temperatures to others

•To spot any possible systematic in RAVE temperatures•Use a variety of reference temperatures:

Photometric: V-K using Ramirez calibrations with reddening corrections and constraintsJon’s spectroscopic temperatures: excitation balanceSoubiran and Girard temperatures: photometric, excitation balance, H

Cayrel compilation temperatures: photometric, H

•Thus we have a broad range of methods to compare our temperature calculations to

Stellar ParametersM

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There is a significant systematic for the dwarfs

GREEN - V-K photometricBLACK - Jon’s calculationCYAN - Soubiran and GirardPURPLE - Cayrel

Stellar ParametersM

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It remains at higher S/N values

GREEN - V-K photometricBLACK - Jon’s calculationCYAN - Soubiran and GirardPURPLE - Cayrel

SummaryM

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•Processing continuing as normal

•New status reports to aid dissemination of data and

identification of problems

•Zero-pointsRemoval of bad fields

Manual refitting backlog: watch out!

Possible problem with star RV correlation - investigating

•FP3Sky RVs good

Repeats good, apart from mean offset - investigating

New report out soon

•Possible temperature systematic