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Title:
A Second Stellar Color Locus: a Bridge from White Dwarfs to M stars
Authors:
Smolčić, Vernesa; Ivezić, Željko; Knapp, Gillian R.; Lupton, Robert H.; Pavlovski, Krešimir; Ilijić, Saša; Schlegel, David; Smith, J. Allyn; McGehee, Peregrine M.; Silvestri, Nicole M.; Hawley, Suzanne L.; Rockosi, Constance; Gunn, James E.; Strauss, Michael A.; Fan, Xiaohui; Eisenstein, Daniel; Harris, Hugh
Affiliation:
AA(Princeton University Observatory, Princeton, NJ 08544.; University of Zagreb, Department of Physics, Bijenička cesta 32, 10000 Zagreb, Croatia.), AB(Princeton University Observatory, Princeton, NJ 08544.; H. N. Russell Fellow, on leave from the University of Washington.), AC(Princeton University Observatory, Princeton, NJ 08544.), AD(Princeton University Observatory, Princeton, NJ 08544.), AE(University of Zagreb, Department of Physics, Bijenička cesta 32, 10000 Zagreb, Croatia.), AF(Department of Applied Physics, Unska 3, 10000 Zagreb, Croatia.), AG(Princeton University Observatory, Princeton, NJ 08544.), AH(Department of Physics and Astronomy, P.O. Box 3905, University of Wyoming, Laramie, WY 82071-3905.), AI(Los Alamos National Laboratory, MS H820, Los Alamos, NM 87545; Department of Astronomy, New Mexico State University, P.O. Box 30001, Department 4500, Las Cruces, NM 88003.), AJ(University of Washington, Department of Astronomy, Box 351580, Seattle, WA 98195.), AK(University of Washington, Department of Astronomy, Box 351580, Seattle, WA 98195.), AL(University of Washington, Department of Astronomy, Box 351580, Seattle, WA 98195.), AM(Princeton University Observatory, Princeton, NJ 08544.), AN(Princeton University Observatory, Princeton, NJ 08544.), AO(Steward Observatory, 933 North Cherry Avenue, Tucson, AZ 85721.), AP(Steward Observatory, 933 North Cherry Avenue, Tucson, AZ 85721.), AQ(US Naval Observatory, Flagstaff Station, P.O. Box 1149, Flagstaff, AZ 86002.)
Publication:
The Astrophysical Journal, Volume 615, Issue 2, pp. L141-L144. (ApJ Homepage)
Publication Date:
11/2004
Origin:
UCP
ApJ Keywords:
Stars: Binaries: General, Galaxy: Stellar Content, Stars: Statistics, Stars: White Dwarfs
DOI:
10.1086/426475
Bibliographic Code:
2004ApJ...615L.141S

Abstract

We report the discovery of a locus of binary stars in the Sloan Digital Sky Survey (SDSS) g-r versus u-g color-color diagram that connects the colors of white dwarfs and M dwarfs. While its contrast with respect to the main stellar locus is only ~1:2300, this previously unrecognized feature includes 863 stars from the SDSS Data Release 1 (DR1). The position and shape of the feature are in good agreement with predictions of a simple binary star model that consists of a white dwarf and an M dwarf, with the components' luminosity ratio controlling the position along this binary system locus. SDSS DR1 spectra for 47 of these objects strongly support this model. The absolute magnitude-color distribution inferred for the white dwarf component is in good agreement with the models of Bergeron et al.
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