Heavy element opacities and the pulsations of Beta Cepheid stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cepheid Variables, Massive Stars, Metallicity, Opacity, Stellar Evolution, Stellar Oscillations, Heavy Elements, Stellar Models, Stellar Temperature

Scientific paper

Using recently published opacity tables, the evolution and stability of
a 15-solar mass star with initial metallicities Z = 0.02 and 0.03 is
re-examined. For Z = 0.03, radial and nonradial pulsations are found to
be unstable for log Teff between 4.326 and 4.43. Implications of the
results for the Beta Cepheid phenomenon are discussed.

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