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On the origin of the Barium stars

Published online by Cambridge University Press:  04 August 2017

Erika Böhm-Vitense
Erika Böhm-Vitense*
Affiliation:
Astronomy Department, University of Washington, Seattle, WA

Abstract

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We show that Ba stars cannot originate from single stars, they can only be formed in binaries by mass transfer. The companion must then have been an evolved star with log L/L⊙ ≥ 3.2, requiring a radius larger than 0.5 a.u., explaining the long periods of the observed Ba star binaries. If the companion lost half of its mass to the present Ba star we expect to see a white dwarf companion now. Companions with Teff ≈ 12000K have been seen for the nearest Ba stars. For Ba stars at larger distances companions can only be detected if they have Teff ≥ 20000K.

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. 191 - 194
Copyright
Copyright © Reidel 1984 

References

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