Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975mmsai..46..455c&link_type=abstract
Società Astronomica Italiana, Memorie, vol. 46, Nov. 1975, p. 455-460.
Astronomy and Astrophysics
Astronomy
3
Cepheid Variables, Giant Stars, Globular Clusters, Stellar Evolution, Variable Stars, Abundance, Frequency Distribution, Helium, Stellar Luminosity, Stellar Mass
Scientific paper
The apparent anomalous age (greater than that of M 3 type clusters) of the globular cluster M 14, inferred from the shape of the HR diagram and from the properties of 70-odd RR Lyrae variables belonging to the cluster, is examined with attention given to evolutionary processes. The initial He content of the cluster, the evolutionary status of the cluster as compared to M 3 and M 13 type clusters, and periodicity evident in the period frequency distribution, are investigated. The periods, luminosities, and masses of the RR Lyrae type pulsating variables, the parameters of the instability regions, and stellar type populations are examined for evolutionary inferences. It is suggested that M 14 is intermediate between M 3 type clusters and M 13 type clusters poor in RR Lyrae pulsating stars.
Caputo Filippina
Castellani Vittorio
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