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The link between barium stars and optically bright post-AGB binaries

Published online by Cambridge University Press:  25 May 2016

Hans Van Winckel
Affiliation:
1Instituut voor Sterrenkunde, K. U. Leuven, Belgium
Christoffel Waelkens
Affiliation:
1Instituut voor Sterrenkunde, K. U. Leuven, Belgium
Alain Jorissen
Affiliation:
2Institut d'Astronomie, ULB, Belgium
Sophie Van Eck
Affiliation:
2Institut d'Astronomie, ULB, Belgium
Pierre North
Affiliation:
3Institut d'Astronomie de l' Université de Lausanne, Switzerland
Rens Waters
Affiliation:
4“Anton Pannekoek”, VU Amsterdam and SRON Groningen, The Netherlands

Extract

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Systematic radial velocity monitoring programs revealed that all optically bright, high-latitude post-AGB stars that show a near-IR excess in their energy distribution are binaries (see the contribution of R. Waters et al. in these proceedings). A standard AGB evolution for the shorter period objects seems, however, impossible since the orbits are too small to accommodate an AGB star! Non-standard phenomena connected to the specific binary nature have to be invoked in order to understand these systems.

Type
V. From AGB to Planetary Nebulae
Copyright
Copyright © Kluwer 1997