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On the Sandage period shift effect among field RR Lyrae stars
Lee, Young-Wook
AA(Yale University, New Haven, CT; Victoria, University, Canada)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 363, Nov. 1, 1990, p. 159-167. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Blue Stars, Giant Stars, Globular Clusters, Horizontal Branch Stars, Stellar Oscillations, Metallicity, Stellar Evolution, Stellar Luminosity, Stellar Models
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The origin of the disagreement between the results of the synthetic horizontal branch (HB) model of Lee et al. (1990) and the Sandage (1990) analysis of Lub's (1977) data on a sample of field RR Lyrae stars is investigated, extending the original synthetic HB calculations of Lee et al. to all HB types over the metallicity range of the Galactic halo. It is shown that the period shifts of the RR Lyrae stars in globular clusters depend strongly on their HB type and metallicity. Results suggest that the disagreement between the slopes, Delta logP(Teff)/Delta Fe/H, obtained by Lee et al. and the ones obtained by Sandage can be explained by the fact that Lub's sample may have contained many highly evolved stars in the metallicity range of Fe/H between -2.0 and -1.6, since Lee's analysis did not include these stars.

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