The Sandage effect revisited

Details The Sandage effect revisited The Sandage effect revisited

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...261..457c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 261, no. 2, p. 457-471.

Statistics

Computation

22

Computational Astrophysics, Horizontal Branch Stars, Stellar Models, Abundance, Helium, Stellar Evolution, Stellar Luminosity, Stellar Mass, Stellar Temperature

Scientific paper

A new set of synthetic horizontal-branch (SHB) models is used to analyze the Sandage period-shift effect. It is shown that the slope of the evolutionary period-metallicity relation for the RR Lyrae stars does depend on the precise effective temperature value. The effect of the helium abundances and the alpha-elements on the theoretical period-metallicity relation for the RR Lyrae stars is discussed. It is shown that both higher He abundances and enhanced proportions of the alpha-elements can result in significantly lower slopes for such a relation.

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