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Selected topics on the evolution of low and intermediate mass stars

Published online by Cambridge University Press:  04 August 2017

Alvio Renzini
Alvio Renzini*
Affiliation:
Dipartimento di Astronomia, Bologna, Italy

Abstract

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Among the many aspects of the evolution of low and intermediate mass stars, two representative topics are selected for this review: the question why stars become red giants, and the problem of the age determination of galactic globular clusters. Concerning the first topic, it is shown that this happens because of a thermal instability taking place in the stellar envelopes, and the physical nature of this instability is identified. Several ramifications of these findings are then briefly mentioned. Concerning the second topic, the Oosterhoff-Sandage effect is briefly described, together with its implications for the age estimates and the problems rised by its interpretation in terms of evolutionary models. In this connection, it is suggested that an enhanced overall abundance of the elements CNO and Ne may solve these problems, although further evolutionary calculations are required before reaching firm conclusions. It is also amphasized for both topics the important role played by the metal contribution to the radiative opacity at middle temperatures.

Type
I. EVOLUTION OF LOW AND INTERMEDIATE MASS STARS OBSERVATIONS AND MODELS
Information
Symposium - International Astronomical Union , Volume 105: Observational Tests of the Stellar Evolution Theory , 1984 , pp. 21 - 40
Copyright
Copyright © Reidel 1984 

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