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Title:
New Close Binary Systems from the SDSS-I (Data Release Five) and the Search for Magnetic White Dwarfs in Cataclysmic Variable Progenitor Systems
Authors:
Silvestri, Nicole M.; Lemagie, Mara P.; Hawley, Suzanne L.; West, Andrew A.; Schmidt, Gary D.; Liebert, James; Szkody, Paula; Mannikko, Lee; Wolfe, Michael A.; Barentine, J. C.; Brewington, Howard J.; Harvanek, Michael; Krzesinski, Jurik; Long, Dan; Schneider, Donald P.; Snedden, Stephanie A.
Affiliation:
AA(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195, USA; , , , , , .), AB(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195, USA; , , , , , .), AC(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195, USA; , , , , , .), AD(Astronomy Department, 601 Campbell Hall, University of California, Berkeley, CA 94720, USA; .), AE(Department of Astronomy and Steward Observatory, University of Arizona, Tucson, AZ 85721, USA; , .), AF(Department of Astronomy and Steward Observatory, University of Arizona, Tucson, AZ 85721, USA; , .), AG(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195, USA; , , , , , .), AH(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195, USA; , , , , , .), AI(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195, USA; , , , , , .), AJ(Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349, USA; , , , , .), AK(Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349, USA; , , , , .), AL(Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349, USA; , , , , .), AM(Mt. Suhora Observatory, Cracow Pedagogical University, ul. Podchorazych 2, 30-084 Cracow, Poland; .), AN(Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349, USA; , , , , .), AO(Department of Astronomy, Pennsylvania State University, PA 16802, USA; .), AP(Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349, USA; , , , , .)
Publication:
The Astronomical Journal, Volume 134, Issue 2, pp. 741-748. (AJ Homepage)
Publication Date:
08/2007
Origin:
UCP
AJ Keywords:
Stars: Binaries: Close, Stars: Novae, Cataclysmic Variables, Stars: Low-Mass, Brown Dwarfs, Stars: Magnetic Fields, Stars: White Dwarfs
DOI:
10.1086/519242
Bibliographic Code:
2007AJ....134..741S

Abstract

We present the latest catalog of more than 1200 spectroscopically selected close binary systems observed with the Sloan Digital Sky Survey through Data Release Five. We use the catalog to search for magnetic white dwarfs in cataclysmic variable progenitor systems. Given that approximately 25% of cataclysmic variables contain a magnetic white dwarf, and that our large sample of close binary systems should contain many progenitors of cataclysmic variables, it is quite surprising that we find only two potential magnetic white dwarfs in this sample. The candidate magnetic white dwarfs, if confirmed, would possess relatively low magnetic field strengths (BWD<10 MG) that are similar to those of intermediate Polars but are much less than the average field strength of the current Polar population. Additional observations of these systems are required to definitively cast the white dwarfs as magnetic. Even if these two systems prove to be the first evidence of detached magnetic white dwarf + M dwarf binaries, there is still a large disparity between the properties of the presently known cataclysmic variable population and the presumed close binary progenitors.
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