论文信息 - A Catalog of Spectroscopically Selected Close Binary Systems from the Sloan Digital Sky Survey Data Release Four - 字舞流文

A Catalog of Spectroscopically Selected Close Binary Systems from the Sloan Digital Sky Survey Data Release Four

We present a spectroscopic sample of 747 detached close binary systems from the Sloan Digital Sky Survey (SDSS) Fourth Data Release. The majority of these binaries consist of a white dwarf primary and a low-mass secondary (typically M dwarf) companion. We have determined the temperature and gravity for 496 of the white dwarf primaries and the spectral type and magnetic activity properties for 661 of the low-mass secondaries. We have estimated the distances for each of the white dwarf-main-sequence star binaries and use white dwarf evolutionary grids to establish the age of each binary system from the white dwarf cooling times. With respect to a spectroscopically identified sample of ~8000 isolated M dwarf stars in the SDSS, the M dwarf secondaries show enhanced activity with a higher active fraction at a given spectral type. The white dwarf temperatures and gravities are similar to the distribution of ~1900 DA white dwarfs from the SDSS. The ages of the binaries in this study range from ~0.5 Myr to nearly 3 Gyr (average age ~0.20 Gyr).

James Liebert | Andrew A. West | Gary D. Schmidt | Suzanne L. Hawley | Atsuko Nitta | Paula Szkody | John J. Bochanski | Peregrine M. McGehee | Hugh C. Harris | Stephanie A. Snedden | Michael Harvanek | Jurek Krzesinski | Donald P. Schneider | J. C. Barentine | Nicole M. Silvestri | E. Neilsen | Daniel J. Eisenstein | J. Brinkmann | J. Bochanski | D. Eisenstein | S. Hawley | D. Long | P. McGehee | H. Brewington | S. Snedden | P. Szkody | J. A. Smith | M. Harvanek | J. Krzesinski | J. Barentine | S. Kleinman | A. Nitta | J. Liebert | A. West | H. Harris | N. Silvestri | G. Schmidt | M. Wolfe | Dan Long | Howard Brewington | Michael A. Wolfe | John Brinkmann | J. Allyn Smith | Scot Kleinman | D. Schneider | Eric H. Neilsen Jr. | P. Mcgehee | J. A. Smith | D. Schneider | Hugh C. Harris | Gary D. Schmidt

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