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Orbital Elements of a Sample of S Stars: Testing the Barium - S Evolutionary Connection

Published online by Cambridge University Press:  07 August 2017

A. Jorissen  and
M. Mayor
A. Jorissen
Affiliation:
1European Southern Observatory, Garching bei München, Germany
M. Mayor
Affiliation:
2Observatoire de Genève, Switzerland

Abstract

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Orbital elements for 8 non-Mira S stars (derived from CORAVEL observations and from Griffin 1984) are compared with those of barium stars. In all but one case, the mass functions are compatible with white dwarf companions. No periods shorter than 600 d are found, while the 5 orbits with 600 < P(d) < 900 all have e ≤ 0.1, in contrast with the situation prevailing for barium stars. It is suggested that the hypothesis of an evolutionary link between barium and non-Mira (no Tc) S stars can be reconciled with these differences provided that these S stars are low-mass stars populating the first giant branch instead of the asymptotic giant branch, as usually thought.

Type
Oral and Contributed Papers
Information
Symposium - International Astronomical Union , Volume 151: Evolutionary Processes in Interacting Binary Stars , 1992 , pp. 407 - 410
Copyright
Copyright © Kluwer 1992 

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