Location of Repository

SDSS DR7 white dwarf catalog

By Scot James Kleinman, Souza Oliveira Kepler, Detlev Koester, Ingrid Domingos Pelisoli, Viviane Peçanha Antonio, Atsuko Nitta, Jose Eduardo da Silveira Costa, Jerzy Krzesinski, Patrick Dufour, François-René Lachapelle, Pierre Bergeron, Ching-Wa Yip, Hugh C. Harris, D.J. Eisenstein, Leandro Gabriel Althaus and Alejandro Hugo Córsico

Abstract

We present a new catalog of spectroscopically confirmed white dwarf stars from the Sloan Digital Sky Survey (SDSS) Data Release 7 spectroscopic catalog. We find 20,407 white dwarf spectra, representing 19,712 stars, and provide atmospheric model fits to 14,120 DA and 1011 DB white dwarf spectra from 12,843 and 923 stars, respectively. These numbers represent more than a factor of two increase in the total number of white dwarf stars from the previous SDSS white dwarf catalogs based on DR4 data. Our distribution of subtypes varies from previous catalogs due to our more conservative, manual classifications of each star in our catalog, supplementing our automatic fits. In particular, we find a large number of magnetic white dwarf stars whose small Zeeman splittings mimic increased Stark broadening that would otherwise result in an overestimated log g if fit as a non-magnetic white dwarf. We calculate mean DA and DB masses for our clean, non-magnetic sample and find the DB mean mass is statistically larger than that for the DAs

Topics: Alargamento de linha espectral, Catalogs, Magnetic fields, Catalogos astronomicos, Anãs brancas, Stars: luminosity function, mass function, Efeito stark, Surveys, White dwarfs, Efeito Zeeman, Atmosfera estelar, Modelos estelares, Magnetismo estelar
Year: 2015
OAI identifier: oai:agregador.ibict.br.PC_UFRGS:oai:www.lume.ufrgs.br:10183/109068
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://www.rcaap.pt/detail.jsp... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.