Studies of Cepheid-type variability. VII - Stellar opacities and multimode Cepheid variables

Details Studies of Cepheid-type variability. VII - Stellar opacities and multimode Cepheid variables Studies of Cepheid-type variability. VII - Stellar opacities and multimode Cepheid variables

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...238..160p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 238, no. 1-2, Nov. 1990, p. 160-162.

Astronomy and Astrophysics

Astrophysics

14

Cepheid Variables, Stellar Oscillations, Metallicity, Opacity, Stellar Models

Scientific paper

Until now the most attractive explanation for the discrepant period ratios of double mode bariable stars has been the hypothesis of increased metal opacities. Here the unique variable stars HR 6522 and AC Andromedae and three further double mode variable stars are used to test this hypothesis. The data for AC And are in good agreement with the hypothesis, but the additional tests are inconclusive. It is suggested that observed period ratios 0.82-0.84, usually taken as evidence for non-radial oscillations, may in fact indicate radial oscillations in the second and third overtones.

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