A self-consistent approach to the age of globular cluster M15

Details A self-consistent approach to the age of globular cluster M15 A self-consistent approach to the age of globular cluster M15

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...138..457c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 138, no. 2, Sept. 1984, p. 457-463. Sponsorship: Conselho Nacional de Pesquisa

Astronomy and Astrophysics

Astrophysics

14

Chronology, Globular Clusters, Stellar Evolution, Cosmology, Errors, Hertzsprung-Russell Diagram, Stellar Magnitude

Scientific paper

The masses of double model pulsator HB stars, i.e., RR Lyrae variables, in the M15 cluster are evaluated to estimate the cluster age. The pulsator luminosities are based on a luminosity-temperature-period relation and allow determination of the cluster distance. A total of 63 pulsators are examined, with temperatures obtained from the dereddened colors, the E(B-V) values. An increase in the forbidden CNO/forbidden Fe ratio to 1.1 is assumed in order to calculate a cluster age of 10-16 billion yr. A self-consistent error estimation is performed, and comparisons are made with the Sandage (1982) results for the M3 pulsators. The results suggest that an upper limit of 70-80 could be placed on the Hubble constant, and that most of the mass of the universe may be contained in nuclear matter.

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