Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:astro-ph/0503601)
· On-line Data
· References in the article
· Citations to the Article (19) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (1)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Cool White Dwarfs in the Sloan Digital Sky Survey
Authors:
Kilic, Mukremin; Munn, Jeffrey A.; Harris, Hugh C.; Liebert, James; von Hippel, Ted; Williams, Kurtis A.; Metcalfe, Travis S.; Winget, D. E.; Levine, Stephen E.
Affiliation:
AA(Department of Astronomy, University of Texas at Austin, 1 University Station C1400, Austin, TX 78712; .), AB(US Naval Observatory, 10391 West Naval Observatory Road, Flagstaff, AZ 86001-8521.), AC(US Naval Observatory, 10391 West Naval Observatory Road, Flagstaff, AZ 86001-8521.), AD(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721.), AE(Department of Astronomy, University of Texas at Austin, 1 University Station C1400, Austin, TX 78712; .), AF(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721.), AG(Harvard-Smithsonian Center for Astrophysics, Mail Stop 16, 60 Garden Street, Cambridge, MA 02138.), AH(Department of Astronomy, University of Texas at Austin, 1 University Station C1400, Austin, TX 78712; .), AI(US Naval Observatory, 10391 West Naval Observatory Road, Flagstaff, AZ 86001-8521.)
Publication:
The Astronomical Journal, Volume 131, Issue 1, pp. 582-599. (AJ Homepage)
Publication Date:
01/2006
Origin:
UCP
AJ Keywords:
Stars: Atmospheres, Stars: Evolution, Stars: White Dwarfs
Abstract Copyright:
(c) 2006: The American Astronomical Society
DOI:
10.1086/497962
Bibliographic Code:
2006AJ....131..582K

Abstract

A reduced proper motion diagram utilizing Sloan Digital Sky Survey (SDSS) photometry and astrometry and USNO-B plate astrometry is used to separate cool white dwarf candidates from metal-weak, high-velocity, main-sequence Population II stars (subdwarfs) in the SDSS Data Release 2 imaging area. Follow-up spectroscopy using the Hobby-Eberly Telescope, the MMT, and the McDonald 2.7 m telescope is used to demonstrate that the white dwarf and subdwarf loci separate cleanly in the reduced proper motion diagram and that the contamination by subdwarfs is small near the cool white dwarf locus. This enables large, statistically complete samples of white dwarfs, particularly the poorly understood cool white dwarfs, to be created from the SDSS imaging survey, with important implications for white dwarf luminosity function studies. SDSS photometry for our sample of cool white dwarfs is compared to current white dwarf models.

Based on observations obtained with the Hobby-Eberly Telescope, which is a joint project of the University of Texas at Austin, Pennsylvania State University, Stanford University, Ludwig-Maximilians-Universität München, and Georg-August-Universität Göttingen.

Observations reported here were obtained at the MMT Observatory, a joint facility of the Smithsonian Institution and the University of Arizona.

Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints
    


SAO/NASA ADS Homepage | ADS Sitemap | Query Form | Basic Search | Preferences | HELP | FAQ