Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....75..247c&link_type=abstract
Astronomy and Astrophysics, vol. 75, no. 1-2, May 1979, p. 247, 248.
Astronomy and Astrophysics
Astrophysics
2
Amplitude Distribution Analysis, Cepheid Variables, Globular Clusters, Periodic Variations, Stellar Luminosity, Helium, Luminous Intensity, Stellar Mass, Stellar Models
Scientific paper
Theoretical period-amplitude (P-A) relations have been derived for RR Lyrae variables in globular clusters from computations by Stellingwerf (1975) and results have been compared with data from the Cacciari and Renzini (1976) catalog. Good qualitative agreement was found, although quantitative discrepancies in mass, luminosities, and helium and metal content were noted. The variation of P-A relations with luminosity was used to compare variables in different clusters. It is concluded that available data support the current evolutionary model for these objects. The luminosity of the horizontal branch in Omega Cen seems to be higher than in other well-observed clusters.
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