A New Technique for Probing Convection in Pulsating White Dwarf Stars

Details A New Technique for Probing Convection in Pulsating White Dwarf Stars A New Technique for Probing Convection in Pulsating White Dwarf Stars

2005-07-19

arxiv.org/abs/astro-ph/0507444v1

Astrophys.J.633:1142-1149,2005

Astronomy and Astrophysics

Astrophysics

8 pages, 7 figures, accepted for publication in the ApJ

Scientific paper

10.1086/466511

In this paper we demonstrate how pulsating white dwarfs can be used as an astrophysical laboratory for empirically constraining convection in these stars. We do this using a technique for fitting observed non-sinusoidal light curves, which allows us to recover the thermal response timescale of the convection zone (its "depth") as well as how this timescale changes as a function of effective temperature. We also obtain constraints on mode identifications for the pulsation modes, allowing us to use asteroseismology to study the interior structure of these stars. Aspects of this approach may have relevance for other classes of pulsators, including the Cepheids and RR Lyrae stars.

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