Chemical composition effects and double-mode RR Lyrae masses

Details Chemical composition effects and double-mode RR Lyrae masses Chemical composition effects and double-mode RR Lyrae masses

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...259l..46k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 259, no. 2, p. L46-L48.

Astronomy and Astrophysics

Astrophysics

34

Chemical Composition, Heavy Elements, Lyra Constellation, Opacity, Stellar Mass, Stellar Oscillations, Abundance, Stellar Luminosity, Variable Stars

Scientific paper

On the basis of accumulating observational evidence that Pop. II stars are overabundant in oxygen and other heavy elements, we compute RR Lyrae models with new mixtures of heavy elements. Comparing these results with the ones obtained with a solar (Anders-Grevesse) composition we conclude that: (1) with the same total metal abundance Z the models with Pop. II mixtures yield masses smaller than the ones with a solar mixture; (2) with the same absolute Fe abundance the new masses are higher; (3) these two effects increase with Z; and (4) the masses of the double-mode RR Lyrae (especially Oosterhoff I) stars obtained with the period ratio method therefore are left uncertain up to about 0.1 solar mass until accurate abundances for the dominant elements become available for individual stars.

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