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Binarity among Barium Dwarfs and CH Subgiants: Will They Become Barium Giants?

Published online by Cambridge University Press:  25 May 2016

Pierre North ,
Alain Jorissen  and
Michel Mayor
Pierre North
Affiliation:
Institut d'Astronomie de l'Université de Lausanne, CH-1290 Chavannes-des-Bois, Switzerland
Alain Jorissen
Affiliation:
Institut d'Astronomie et d'Astrophysique, Université Libre de Bruxelles B-1050 Bruxelles, Belgium
Michel Mayor
Affiliation:
Observatoire de Genève, CH-1290 Sauverny, Switzerland

Abstract

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We report the results of monitoring the radial velocities of 31 confirmed Ba dwarfs and CH subgiants, showing that about 27 of them have a variable radial velocity. Therefore, mass transfer in a binary most probably explains their chemical anomalies, as for the Ba giants. The orbital parameters of the 14 systems having sufficient phase coverage are very similar to those of the Ba giants. Whether the CH subgiants and Ba dwarfs may become Ba giants is discussed briefly. Most of the marginal Ba dwarfs listed by Edvardsson et al. (1993) are single, so that their chemical peculiarity, if real, cannot be due to binary evolution.

Type
Session VI — Binarity
Information
Symposium - International Astronomical Union , Volume 177: The Carbon Star Phenomenon , 2000 , pp. 269 - 275
Copyright
Copyright © Kluwer 2000 

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