Spectral Evolution of White Dwarf Stars

Details Spectral Evolution of White Dwarf Stars Spectral Evolution of White Dwarf Stars

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.2201c&link_type=abstract

American Astronomical Society, AAS Meeting #211, #22.01; Bulletin of the American Astronomical Society, Vol. 39, p.773

Astronomy and Astrophysics

Astronomy

Scientific paper

We made realistic calculations on the spectral evolution of white dwarf stars under effects of Interstellar Medium accretion. In particular, we exploited the H-He plasma mixing scheme given by Saumon, Chabrier and van Horn(1995) to properly account for the evolution of helium abundance at the white dwarf surface. We incorporate this change of composition into a self-consistent calculation of surface boundary conditions and convective mixing. We show that, under reasonable initial conditions, white dwarf stars could undergo complicated spectral evolution during the course of their cooling. We compare our results to the observed features such as the non-DA gap of Bergeron, Ruiz and Leggett(1997).

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