Physics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...360..119s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 360, Sept. 1, 1990, p. 119-128.
Physics
17
Giant Stars, Globular Clusters, Stellar Models, Stellar Physics, Variable Stars, Blue Stars, Canonical Forms, Centaurus Constellation, Stellar Mass, Stellar Oscillations
Scientific paper
Masses, absolute temperatures, and luminosities are derived for a large sample of RRc stars in the globular cluster Omega Centauri, interpreting the observed periods, relative luminosities, and Fourier phases in terms of linear and hydrodynamic pulsation models. The resulting masses agree with those of the RRd stars in other clusters and the derived parameters pass a number of other tests which are independent of their derivation. The results disagree with current horizontal branch models and also imply that the canonical slope of the log T(e) versus B-V relation is too steep by a factor of two. It is shown that the disagreement between the RRd masses and those based on horizontal branch calculations cannot be reconciled by reasonable changes in metallicity or opacity. No correlation between the masses of the Omega Cen RRc stars and their metallicities is found, and it is shown that this cannot be due to the late redward evolution by the RR Lyrae stars of lower mass.
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