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Title:
A Catalog of Spectroscopically Selected Close Binary Systems from the Sloan Digital Sky Survey Data Release Four
Authors:
Silvestri, Nicole M.; Hawley, Suzanne L.; West, Andrew A.; Szkody, Paula; Bochanski, John J.; Eisenstein, Daniel J.; McGehee, Peregrine; Schmidt, Gary D.; Smith, J. Allyn; Wolfe, Michael A.; Harris, Hugh C.; Kleinman, Scot J.; Liebert, James; Nitta, Atsuko; Barentine, J. C.; Brewington, Howard J.; Brinkmann, John; Harvanek, Michael; Krzesiński, Jurek; Long, Dan; Neilsen, Eric H., Jr.; Schneider, Donald P.; Snedden, Stephanie A.
Affiliation:
AA(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195; , , , , , .), AB(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195; , , , , , .), AC(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195; , , , , , .), AD(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195; , , , , , .), AE(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195; , , , , , .), AF(Department of Astronomy and Steward Observatory, University of Arizona, Tucson, AZ 85721; , , .), AG(Los Alamos National Laboratory, LANSCE-8, MS H82, Los Alamos, NM 87545; .; Department of Astronomy, New Mexico State University, P.O. Box 30001, Department 4500, Las Cruces, NM 88003; .), AH(Department of Astronomy and Steward Observatory, University of Arizona, Tucson, AZ 85721; , , .), AI(Los Alamos National Laboratory, ISR-4, MS D448, Los Alamos, NM 87545; .), AJ(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195; , , , , , .), AK(US Naval Observatory, P.O. Box 1149, Flagstaff, AZ 86002; .), AL(New Mexico State University, Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349; , , , , , , , , , .), AM(Department of Astronomy and Steward Observatory, University of Arizona, Tucson, AZ 85721; , , .), AN(New Mexico State University, Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349; , , , , , , , , , .), AO(New Mexico State University, Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349; , , , , , , , , , .), AP(New Mexico State University, Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349; , , , , , , , , , .), AQ(New Mexico State University, Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349; , , , , , , , , , .), AR(New Mexico State University, Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349; , , , , , , , , , .), AS(New Mexico State University, Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349; , , , , , , , , , .; Mount Suhoro Observatory, Cracow Pedagogical University, Ul. Podchorazych 2, 30-084 Cracow, Poland; .), AT(New Mexico State University, Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349; , , , , , , , , , .), AU(New Mexico State University, Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349; , , , , , , , , , .; Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510; .), AV(Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802; .), AW(New Mexico State University, Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349; , , , , , , , , , .)
Publication:
The Astronomical Journal, Volume 131, Issue 3, pp. 1674-1686. (AJ Homepage)
Publication Date:
03/2006
Origin:
UCP
AJ Keywords:
Stars: Binaries: Close, Stars: Novae, Cataclysmic Variables, Stars: Activity, Stars: Low-Mass, Brown Dwarfs, Stars: White Dwarfs
DOI:
10.1086/499494
Bibliographic Code:
2006AJ....131.1674S

Abstract

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).
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