The canonical anticorrelation between Y and Z in galactic globular clusters and the case of the pulsators in M15

Details The canonical anticorrelation between Y and Z in galactic globular clusters and the case of the pulsators in M15 The canonical anticorrelation between Y and Z in galactic globular clusters and the case of the pulsators in M15

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...123..141c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 123, no. 1, June 1983, p. 141-146.

Astronomy and Astrophysics

Astrophysics

29

Abundance, Cepheid Variables, Galactic Evolution, Globular Clusters, Variable Stars, B Stars, Canonical Forms, Heavy Elements, Helium, Stellar Evolution

Scientific paper

RR Lyrae variables may be used to estimate helium abundance in globular clusters, which, in turn, means to obtain information regarding the primordial helium content. Sandage et al. (1981) have suggested that a variation of Y with the heavy elements abundance (Fe/H) may produce the observed correlation of log P with (Fe/H), provided that those two quantities have a certain anticorrelation. The present investigation is concerned with an analysis of RR Lyrae variables in clusters. It is found that the result considered by Sandage et al. (1981) is strongly dependent on the assumptions about the evolutionary parameters. It holds only within the so-called 'canonical' frame where no stellar rotation is taken into account and a solar value for the ratio between CNO content and heavy element abundance is assumed. On the other hand, a recent evaluation of the mean mass of RR Lyrae in M 15 seems to require pulsators masses smaller than those expected on canonical ground.

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