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

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

2004-03-09

arxiv.org/abs/astro-ph/0403218v1

Astrophys.J. 615 (2004) L141-L144

Astronomy and Astrophysics

Astrophysics

submitted to ApJ, 4 pages, 4 color figures

Scientific paper

10.1086/426475

We report the discovery of a locus of stars in the SDSS g-r vs. 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. 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. (1995).

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