The SDSS DR7 White Dwarf Catalog S.J. Kleinman, S.O. Kepler, D. Koester, V. Peçanha, I. Domingos Pelisoli, J.E. da Silveira Costa, P. Dufour, J. Krzesinski, H. Harris, A. Nitta,

Doubling the Number of White Dwarf Stars: The First Sloan Digital Sky Survey White Dwarf Catalog Kleinman, Harris, Eisenstein, Liebert, Nitta, Krzesinski,... ApJ 2004May20 V.607, P.426 EUROWD 2004

What's In It? Data from SDSS DR1: Hand-ID'd ~9000 spectra (complete) Photometry (ugriz), Spectra (~ Å), PMs, Finder Charts, Fits,... 2,551 WDs & 240 Hot SDs 1888 DAs 200 WDM pairs 171 DBs 134 DCs 57 DZs 45 DQs 30 DHs 13 DOs 157 uncertain WDs EUROWD 2004

The SDSS DR4 White Dwarf Catalog Scot J. Kleinman (Subaru) Daniel Eisenstein (U. AZ/Steward Obs.) Jim Liebert (U. AZ/Steward Obs.) Hugh Harris (USNO Flagstaff) & the rest of the SDSS WD collaboration Paper accepted to ApJSupp. astro-ph/ (also EUROWD 2006

Summary 9316 spectroscopically- confirmed WDs Approx new discoveries – roughly doubling McCook and Sion post SDSS-DR1 catalog DAs; 713 DBs; 289 DCs; 133 DZs, 104 DQs; 31/10 DO/PG1159s; 27 WDs; 9 DHs; (774 duplicate spectra). 928 subdwarfs. Usual spectra, photometry, fits to DA/DB Teff and log_g, proper motions, SDSS ID numbers. Online at -> data products -> value-added catalogs -> DR4 WD catalog (das.sdss.org/wdcat/dr4). EUROWD 2006

Fits: Literature Comparisons explanation This is similar to what was seen in the DR1 catalog, but we think we have an explanation now! EUROWD 2006

The Next (DR6) SDSS WD Catalog (SDSS WD Catalog-DS9) Scot Kleinman Gemini Observatory Detlev Koester models, comparison fits Daniel Eisenstein autofit code SDSS WD Group European White Dwarf Workshop 2008 EUROWD 2008

What's new in the Catalog? New models, improved physics, better grid Will re-fit ALL SDSS Catalog WDs with new models and latest reductions – putting all now on the same footing 3,683 (and counting...) new WDs since DR4. Just straight DAs and DBs so far. Questions: Restrict to g 20? Quick or complete? “Normal” or Exotic”? DR6/DR7/DR8...? Online access? EUROWD 2008

New DR6 WDs... EUROWD 2008

Why am I here again? Catalog now based on DR7 Brazilian ambition gained the upper hand and human IDs now complete ~43,000 candidates ~25,000 human IDs ~19000 ( uncertain) WD spectra containing ~1700 duplicates Journal submission planned this year (we're almost there)

The Vital Statistics DAs 7.3,1.7 x DR1,DR4 961 DBs 5.6,1.35 x DR1,DR4 57 DBM, 108 DBZ, 89 DB*, 346DB*: 9.1, 2.2 x DR1,DR4 DBs 1028 DHs 34.3,114 x DR1,DR4 785 DAH 62 DBH 609 DCs 4.5, 2.1 x DR1,DR4 437 DZs 7.7, 3.3 x DR1, DR4 218 DQs 4.8, 2.1 x DR1, DR4 48 DOs 3.7, 1.2 x DR1, DR WDMs 8.2 x DR1 98 Mixed WDs 1135 Uncertain WDs 1409 Subdwarfs

ID self-consistency 1683 objects with 3591 duplicate spectra 242 WD IDs disagree  212 agree in dominant subtype 13 differ by only a colon 141 differ by a subtype or a subtype and a colon 58 differ by more than one subtype  30 disagree in dominant subtype DBA <> DAB, DQ <>DC, DA<>SDB,... still analyzing these

10090 WDs in DR4 catalog Table of our IDs agree 1563 disagree  1330 agree in dominant subtype 254 differ by only a colon 591 differ by a subtype or a subtype and a colon 485 differ by more than one subtype  227 disagree in dominant subtype Initially, 509 escaped our ID process and did not make our candidate list (These have been added, now.) ID self-consistency

Comparison to literature values For pure DA/DBs 205 Objects Previously, we had increasingly higher T than others at large T.

Model Grid Models and grid roughly as described in 2008 Latest Koester models  Includes neutral broadening improvements, Tremblay & Bergeron (2009) VCS tables  Hooper microfield distribution with modifcations from Nafonov et al. (1999)  DBs use ML2/1.25 Grid density increased and made more uniform Extended to log(g)=10.0 and Teff(DB) to 50,000K

Candidate Generation Two-pronged candidate strategy 1: Reproduce DR4 color / PM / z / flag... selection entirely within DR7 CAS : spectra 2: Use targeting and SEGUE classification output to add anything targeted or analyzed to be a possible white dwarf star : spectra unique spectra (18981 spectra satisfied both sets of criteria) 78% of spectra satisfying both criteria were WDs 30% / 6% for satisfying only DR4 / SEGUE Used other SDSS catalogs to reduce sample further to spectra

Magnetic Eyes?

Liberal Eyes!

Summary DR7 Catalog roughly 2xDR4 – coming this year! Ambitious Brazilians lead to conservative “pure” DA/DB eyeballed sample When in doubt, look at the images! When in doubt, it's probably a selection effect! DR8 to contain final SEGUE-II spectra – due December, 2010