Evolution of low-mass stars with extended atmospheres

Astronomy and Astrophysics – Astronomy

Scientific paper

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Asymptotic Giant Branch Stars, Horizontal Branch Stars, Stellar Atmospheres, Stellar Evolution, Stellar Models, Stellar Luminosity, Stellar Mass

Scientific paper

The details of the evolution of a low-mass horizontal-branch star through the asymptotic giant phase under the assumption of an extended atmosphere and an extended and mass-including atmosphere are given in comparison with the evolution of the same model without extension. The evolution of the extended model, at least for the last, more luminous phases (after 60 Myr) is a little faster than the evolution of the plane-parallel compact model, while the inclusion of mass in the extended atmosphere slows down the evolution.

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