The opacity mechanism in roAp stars

Details The opacity mechanism in roAp stars The opacity mechanism in roAp stars

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.464..419c&link_type=abstract

In: Proceedings of the SOHO 10/GONG 2000 Workshop: Helio- and asteroseismology at the dawn of the millennium, 2-6 October 2000,

Physics

Stars: Oscillations, Stars: Chemically Peculiar, Variables

Scientific paper

In the present paper we present the first results of work whose main goal is to understand the details of the process of high-order mode excitation in roAp stars. Motivated by the work by Balmforth et al. (1999, 2000), according to which convection might be suppressed in the polar regions of roAp stars, we show that in a radiative region the excitation of high-order pulsations takes place in the region of hydrogen ionization, and is the direct consequence of the abrupt change in the opacity derivative κT = (∂lnκ/∂lnT)ρ in these layers.

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