The dependence of the surface and interior characteristics of theoretical stellar models, evolved with variable G, on the age of the isochrone

Details The dependence of the surface and interior characteristics of theoretical stellar models, evolved with variable G, on the age of the isochrone The dependence of the surface and interior characteristics of theoretical stellar models, evolved with variable G, on the age of the isochrone

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983baicz..34..149p&link_type=abstract

Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 34, no. 3, 1983, p. 149-154.

Astronomy and Astrophysics

Astronomy

1

Stellar Evolution, Stellar Interiors, Stellar Models, Stellar Structure, Chronology, Stellar Mass, Stellar Temperature

Scientific paper

The evolution of the surface and interior characteristics of theoretical stellar models, evolved under the assumption of the Brans-Dicke cosmology (decrease of the gravitational constant G with time), is discussed for models with the same mass in three isochrones (of one, three and five billion years of age). As the age of the isochrone increases the less massive models behave more and more like the more massive models of the isochrone with smaller age. The theoretical isochrones cannot be used as age indicators, at least not as freely as the ones received with constant G, since the position and shape of the isochrone for clusters of the same age and chemical composition depends also on the initial value of G as well as on the law of G variation.

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