A Second Stellar Color Locus: a Bridge from White Dwarfs to M Stars (CROSBI ID 109653)
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Podaci o odgovornosti
Smolčić, V. ; Ivezić, Ž. ; Knapp, G.R. ; Lupton, R.H. ; Pavlovski, K. ; Ilijić, S. ; Schlegel, D. ; Smith, J.A. ; McGehee, P.M. ; Silvestri, N.M., Hawley, S.L. ; Rockosi, C. ; Gunn, J.E. ; Strauss, M.A. ; Fan, X. ; Eisenstein, D. ; Harris, H.
engleski
A Second Stellar Color Locus: a Bridge from White Dwarfs to M Stars
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 about 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.
binaries; galaxy; white dwarfs; stellar contents
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