Red giants in old open clusters - A test for stellar evolution

Details Red giants in old open clusters - A test for stellar evolution Red giants in old open clusters - A test for stellar evolution

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...136..355b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 136, no. 2, July 1984, p. 355-362. Research supported by the Consiglio Naziona

Astronomy and Astrophysics

Astrophysics

62

Open Clusters, Red Giant Stars, Stellar Evolution, Hertzsprung-Russell Diagram, Statistical Distributions, Stellar Composition, Stellar Luminosity

Scientific paper

A group of 38 among the oldest open clusters has been analyzed using theoretical isochrones derived by Ciardullo and Demarque (1977) and evolutionary tracks for central He-burning of Sweigart and Gross (1976). This analysis has been performed in two steps: - comparison of HR diagrams with isochrones statistical check of the fit between observed luminosity distributions of red giant stars and the theoretical ones. The following conclusions have been reached: - clusters older than 2 or 3 billion years (B-V) equal to or greater than 0.35 at MS turnoff point generally agree with theoretical description and allow the determination of reliable ages from the distribution of red giants, - for clusters younger than 2 or 3 billion years, the theory fails in the interpretation of their red giant stars and the statistical analysis rejects all the tested distributions. In fact, their behavior is similar to that of even younger clusters, in which the evolved stars, during shell H-burning, have non-degenerate cores and therefore do not undergo the helium flash. It is suggested that such behavior could be attributed to overshooting from the convective core during central H-burning in the mass range 1.3-2.2 solar masses.

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