RR Lyrae pulsations revisited

Details RR Lyrae pulsations revisited RR Lyrae pulsations revisited

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252l..27k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 2, Dec. 1991, p. L27-L30. Research supported by IBM Corp.

Astronomy and Astrophysics

Astronomy

47

Cepheid Variables, Metallicity, Stellar Composition, Stellar Evolution, Stellar Mass, Stellar Oscillations, Abundance, Heavy Elements, Hydrogen, Infrared Astronomy, Iron, Stellar Luminosity, Stellar Models

Scientific paper

The Livermore opacities are used to reexamine several outstanding problems in RR Lyrae pulsation. The inferred mases for the double-mode stars are found to depend sensitively on the metallicity. With the observed average Fe/H values and with a solar mixture the Oosterhoff-II masses are found to be consistent with current (non-CNO-enhanced) stellar evolution computations; the Oosterhoff-I masses, however, are higher by 0.05-0.10 solar mass. The need is identified on a star by star basis, not only for more reliable Fe/H values, but also for the other heavy-element abundances. Sustained double-mode pulsation with the right periods is still not possible with purely radiative models.

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