1 / 35

Processing Status

Processing Status. June 2009. Mary Williams Padova Meeting, 11/06/09. Talk Outline. Archive status Data flow New Status Reports Zero-points FP3 Stellar parameters: temperatures. Mary Williams Padova Meeting, 11/06/09. Archive status. As of 9th June 2009 285,503 spectra

omar-gardner
Télécharger la présentation

Processing Status

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Processing Status June 2009 Mary Williams Padova Meeting, 11/06/09

  2. Talk Outline • Archive status • Data flow • New Status Reports • Zero-points • FP3 • Stellar parameters: temperatures Mary Williams Padova Meeting, 11/06/09

  3. Archive status • As of 9th June 2009 • 285,503 spectra • Last date in internal and reduced archives: 20090328 • Last date in raw archive: 20090328 Mary Williams Padova Meeting, 11/06/09

  4. Sky Coverage First year data Mary Williams Padova Meeting, 11/06/09 25,689 RVs, ~4,500 deg2

  5. Sky Coverage Second year data Mary Williams Padova Meeting, 11/06/09 26,906 RVs, ~5,000 deg2

  6. Sky Coverage Third year data Mary Williams Padova Meeting, 11/06/09 37,292 RVs, ~8,800 deg2

  7. Sky Coverage Fourth year data Mary Williams Padova Meeting, 11/06/09 87,261 RVs, ~17,200 deg2

  8. Sky Coverage Fifth year data Mary Williams Padova Meeting, 11/06/09 41,002 RVs, ~11,000 deg2

  9. Sky Coverage Sixth year data Mary Williams Padova Meeting, 11/06/09 59,945 RVs, ~11,000 deg2

  10. Sky Coverage Full database Mary Williams Padova Meeting, 11/06/09 218,100 RVs, ~32,000 deg2

  11. Current data flow Problem fields Reduction problem fields SSO AAO (Warren) Padova Reduction (Alessandro) 3-4 days Fortnightly Fortnightly AIP archive Eyeballing of spectra (Rachel, Tomaz, Gal, Paola) AIP Archive Mary Williams Padova Meeting, 11/06/09 Complete to Dec 2007 Weekly AIP Processed Data Archive Irregular AIP Pipeline (Mary) 1/2 week Internal release (at AIP) Last release complete to March 2009

  12. New status reports Mary Williams Padova Meeting, 11/06/09

  13. New status reports Mary Williams Padova Meeting, 11/06/09

  14. New status reports Mary Williams Padova Meeting, 11/06/09

  15. New status reports Mary Williams Padova Meeting, 11/06/09

  16. New status reports Mary Williams Padova Meeting, 11/06/09

  17. Zero-points • 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!! Mary Williams Padova Meeting, 11/06/09

  18. Zero-points • How do we calculate the correction? Un-sky subtracted spectra from single fibre Sky template  Mary Williams Padova Meeting, 11/06/09 SkyRV, eSkyRV, R for single fibre THEN….

  19. Zero-points • THEN we do a polynomial fit across the field SkyRV and eSkyRV Exclusive sky fibre Weight by R value (weight=5xR) Mary Williams Padova Meeting, 11/06/09 Threshold of R=5 The fit gives RVcorrection

  20. Zero-points • 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 Mary Williams Padova Meeting, 11/06/09

  21. Zero-points • The fit can sometimes be very bad… It can become unbound if there are insufficient fibres with R>5 Mary Williams Padova Meeting, 11/06/09 Fiorangela La Forgia

  22. Zero-points • 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 Mary Williams Padova Meeting, 11/06/09

  23. Zero-points • 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… Mary Williams Padova Meeting, 11/06/09 Fiorangela La Forgia

  24. Zero-points • 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 Mary Williams Padova Meeting, 11/06/09

  25. Zero-points • 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… Mary Williams Padova Meeting, 11/06/09

  26. Zero-points • There might be such a issue • Whole fields have have • a non-zero mean RV • Causes shift in Rvcorrection • of the order of a couple • of kms-1 • Work in progress Mary Williams Padova Meeting, 11/06/09

  27. Field Plate 3 • The first 8 FP3 fields • New stiffer cabling used - potential problems! • Check stability of SkyRV Mary Williams Padova Meeting, 11/06/09 Grey : R < 5 Black: R > 5

  28. Field Plate 3 • 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 Mary Williams Padova Meeting, 11/06/09

  29. Field Plate 3 • Some of the fields include repeat observations Mary Williams Padova Meeting, 11/06/09 All but one field look good

  30. Field Plate 3 • The problem field was one of the earlier ones Mary Williams Padova Meeting, 11/06/09 So ignoring this field and |RV(FP3) - RV(previous)| < 20 kms-1

  31. Field Plate 3 • 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 Mary Williams Padova Meeting, 11/06/09

  32. Stellar Parameters • 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 constraints • Jon’s spectroscopic temperatures: excitation balance • Soubiran 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 Mary Williams Padova Meeting, 11/06/09

  33. Stellar Parameters • There is a significant systematic for the dwarfs Mary Williams Padova Meeting, 11/06/09 GREEN - V-K photometric BLACK-Jon’s calculation CYAN- Soubiran and Girard PURPLE - Cayrel

  34. Stellar Parameters • It remains at higher S/N values Mary Williams Padova Meeting, 11/06/09 GREEN - V-K photometric BLACK-Jon’s calculation CYAN- Soubiran and Girard PURPLE - Cayrel

  35. Summary • Processing continuing as normal • New status reports to aid dissemination of data and identification of problems • Zero-points • Removal of bad fields • Manual refitting backlog: watch out! • Possible problem with star RV correlation - investigating • FP3 • Sky RVs good • Repeats good, apart from mean offset - investigating • New report out soon • Possible temperature systematic Mary Williams Padova Meeting, 11/06/09

More Related