Input from opacity data in computation of pulsation instability

Details Input from opacity data in computation of pulsation instability Input from opacity data in computation of pulsation instability

2008-11-07

arxiv.org/abs/0811.1138v1

Astronomy and Astrophysics

Astrophysics

11 pages, 5 figs. Conference: "Interpretation of asteroseismic data" Wroclaw HELAS Workshop, 2008, to be published by Communic

Scientific paper

Several types of variable stars are found along the HR diagram whose pulsations are driven by the $\kappa$-mechanism. Given their nature, the precise ($T_{\rm eff}-L$) domain where these pulsators are located is highly dependent on the value of opacity and on its variation inside the star. We analyze the sensitivity of opacity driven pulsators of spectral-type A and B ($\delta$ Scuti, $\beta$ Cephei and SPB stars) to the opacity tables (OP/OPAL) and to the chemical composition of the stellar matter. We also briefly discuss the effect of opacity on pulsators whose oscillations are not driven by the $\kappa$-mechanism, such as $\gamma$ Doradus and solar-like stars.

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