Barium Stars: a Subclass of Extrinsic AGBs

Astronomy and Astrophysics – Astrophysics

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Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages, Main-Sequence: Late-Type Stars, Carbon Stars, S Stars, And Related Types, Abundances, Chemical Composition, Chemical Composition And Chemical Evolution, Origin, Formation, And Abundances Of The Elements

Scientific paper

Barium stars are stars of Population I. They are considered extrinsic AGB stars as their enhancement in carbon and s-process elements is due to mass transfer in binary systems from the more massive companion, when it reaches the Thermal Pulsing Asymptotic Giant Branch. The accreted material from the AGB donor is mixed with the envelope of the secondary, resulting in a dilution of the s-element abundances. We have made an analysis of the s-element formation inside the AGB donor and the subsequent dilution inside the observed star, for a sample of ~30 barium dwarfs and giants. We obtained theoretical fits for all the stars of our sample. We discuss the intrinsic aspects of these stars and comment on the dilution factors obtained from our fits.

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