A Second Stellar Color Locus: a Bridge from White Dwarfs to M stars

Smolčić, Vernesa and Ivezić, Željko and Knapp, Gillian R. and Lupton, Robert H. and Pavlovski, Krešimir and Ilijić, Saša and Schlegel, David J. and Smith, J. Allyn and McGehee, Peregrine M. and Silvestri, Nicole M. and Hawley, Suzanne L. and Rockosi, Constance and Gunn, James E. and Strauss, Michael A. and Fan, Xiaohui and Eisenstein, Daniel J. and Harris, Hugh (2004) A Second Stellar Color Locus: a Bridge from White Dwarfs to M stars. Astrophysical Journal Letters, 615 (2). L141-L144. ISSN 2041-8205

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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.

Item Type: Article
Keywords: binaries: general; Galaxy: stellar content; stars: statistics; white dwarfs
Date: 2004
Subjects: NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Additional Information: © 2004 American Astronomical Society. Received 2004 March 9; accepted for publication 2004 October 5; published 2004 October 18.
Divisions: Faculty of Science > Department of Physics
Publisher: IOP Publishing
Depositing User: Vernesa Smolčić
Date Deposited: 22 Apr 2015 15:03
Last Modified: 22 Apr 2015 15:03
URI: http://digre.pmf.unizg.hr/id/eprint/3873

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