Helium diffusion in horizontal-branch-star evolutionary models

Astronomy and Astrophysics – Astrophysics

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Gaseous Diffusion, Helium, Horizontal Branch Stars, Stellar Evolution, Stellar Models, Abundance, Globular Clusters, Hydrogen

Scientific paper

The inward diffusion of helium in the atmosphere and subatmosphere of horizontal-branch stars in globular clusters is studied. The process of gravitational diffusion is taken into account, as is the star evolution arising from the burning of helium in the core and hydrogen in an intermediate shell. The models also include an improved procedure for the treatment of the induced semiconvection. The original helium abundance (by mass) was approximately 0.3 in a star model where the mass is 0.53 solar mass; the mass fraction in the helium core was 0.92 at the beginning of the HB evolutionary phase. It is thought that the efficient surface depletion of helium might explain the observed deficiency of helium in blue HB stars. Comparing the evolutionary tracks of models with and without helium diffusion, it is found that some differences may be relevant to the interpretation of the HB morphology with possible implications for the pulsation features.

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