Astrophysics, abstract
astro-ph/0606700

From: Daniel Eisenstein [view email]

Date: Wed, 28 Jun 2006 22:19:43 GMT (581kb)

A Catalog of Spectroscopically Confirmed White Dwarfs from the Sloan Digital Sky Survey Data Release 4

Authors: Daniel J. Eisenstein, James Liebert, Hugh C. Harris, S.J. Kleinmann, Atsuko Nitta, Nicole Silvestri, Scott A. Anderson, J.C. Barentine, Howard J. Brewington, J. Brinkmann, Michael Harvanek, Jurek Krzesinski, Eric H. Neilsen Jr., Dan Long, Donald P. Schneider, Stephanie A. Snedden

Comments: Accepted by the Astrophysical Journal Supplements, 25 pages, 24 figures, LaTeX. The electronic catalog, as well as diagnostic figures and links to the spectra, is available at this http URL

We present a catalog of 9316 spectroscopically confirmed white dwarfs from the Sloan Digital Sky Survey Data Release 4. We have selected the stars through photometric cuts and spectroscopic modeling, backed up by a set of visual inspections. Roughly 6000 of the stars are new discoveries, roughly doubling the number of spectroscopically confirmed white dwarfs. We analyze the stars by performing temperature and surface gravity fits to grids of pure hydrogen and helium atmospheres. Among the rare outliers are a set of presumed helium-core DA white dwarfs with estimated masses below 0.3 Msun, including two candidates that may be the lowest masses yet found. We also present a list of 928 hot subdwarfs.

http://arxiv.org/abs/astro-ph/0606700