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Title:
New Close Binary Systems from the SDSS-I (Data Release Five) and the Orbital Periods for a Subset of Close White Dwarf + M Dwarf Systems
Authors:
Silvestri, Nicole M.; Hawley, S. L.; Dang, L. C.; Krogsrud, D. A.; Smoke, K.; Wolfe, M. A.; Mannikko, L.
Affiliation:
AA(Univ. of Washington), AB(Univ. of Washington), AC(NASA GSFC), AD(Univ. of Washington), AE(Univ. of Washington), AF(Univ. of Washington), AG(Univ. of Washington)
Publication:
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #162.18; Bulletin of the American Astronomical Society, Vol. 38, p.1128
Publication Date:
12/2006
Origin:
AAS
Bibliographic Code:
2006AAS...20916218S

Abstract

We present the latest catalog of more than 1200 spectroscopically selected close binary systems observed with the Sloan Digital Sky Survey (SDSS) through the now public Data Release Five. We use the systems from this catalog to study the influence of the binary environment on the evolution of the low-mass (typically an M dwarf) secondary star. We investigate how the properties of the M dwarf are impacted by the presence of the white dwarf primary using a variety of methods. Candidate systems with very active secondaries and/or low-mass primaries are observed using time-series spectroscopy on the ARC 3.5m to find their orbital periods. Preliminary orbital periods from repeat observations from the SDSS are also presented. In addition to the orbital period study, candidates are observed using photometric time-series on the MDM 2.4m to search for variability (eclipses, rotational modulation) and infrared photometry on the ARC 3.5m to search for faint, low-mass companions. We have now compiled a sample of systems with a wide range of spectral types, orbital periods and ages, and will discuss our results on the properties of these systems.
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