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Binary “Post-AGB” Stars

Published online by Cambridge University Press:  25 May 2016

Hans Van Winckel ,
Christoffel Waelkens  and
Laurens B.F.M. Waters
Hans Van Winckel
Affiliation:
Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Heverlee, Belgium
Christoffel Waelkens
Affiliation:
Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Heverlee, Belgium
Laurens B.F.M. Waters
Affiliation:
Astronomisch Instüuut “Anton Pannekoek,”, Univ. van Amsterdam, Amsterdam, The Netherlands, and SRON Laboratory for Space Research, Groningen, The Netherlands

Abstract

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In this contribution we report on our radial-velocity monitoring of optically bright, high-latitude supergiants that appear to be in a post-AGB evolutionary stage. Binarity is a widespread phenomenon among our sample stars. More precisely: all objects with a near-IR excess in their energy distribution turn out to be binaries while the fraction of binaries in our program stars with only a far-IR excess is very small. The orbital periods, the often non-zero eccentricities, and the sometimes large mass functions set strong constraints on the previous evolution in which mass transfer must have been an important ingredient. We have accumulated observational evidence that the presence of a circum-binary dusty disk has an important dynamical and sometimes even chemical influence on the binary and its evolution. Some objects with a high mass function still defy an explanation.

Type
Session VI — Binarity
Information
Symposium - International Astronomical Union , Volume 177: The Carbon Star Phenomenon , 2000 , pp. 285 - 291
Copyright
Copyright © Kluwer 2000 

References

Artymowicz, P., Clarke, C. J., Lubow, S. H. & Pringle, J. E. 1991, ApJ, 370, L35 Google Scholar
Bogaert, E. 1994, Ph.D. dissertation, K. U. Leuven University Google Scholar
Giridhar, S. 2000, in IAU Symp. 177: The Carbon Star Phenomenon, ed. Wing, R.F. (Kluwer), p. 117 Google Scholar
Han, Z., Eggleton, P. P., Podsiadlowski, P. & Tout, C. A. 1995, MNRAS, 277, 1443 CrossRefGoogle Scholar
Hrivnak, B. J., Kwok, S. & Volk, K. M. 1989, ApJ, 346, 265 Google Scholar
Hrivnak, B. J. & Lu, W. 2000, in IAU Symp. 177: The Carbon Star Phenomenon, ed. Wing, R.F. (Kluwer), p. 293 Google Scholar
Jorissen, A. & Van Eck, S. 2000, in IAU Symp. 177: The Carbon Star Phenomenon, ed. Wing, R.F. (Kluwer), p. 259 Google Scholar
Oudmaijer, R. D., van der Veen, W.E.C.J., Waters, L.B.F.M., Trams, N. R., Waelkens, C. & Engelsman, E. 1992, A&A Supp., 96, 625 Google Scholar
Pottasch, S. R. & Parthasarathy, M. 1988, A&A, 192, 182 Google Scholar
Tout, C. A. & Eggleton, P. P. 1988, ApJ, 334, 357 Google Scholar
Trams, N. R., Waters, L.B.F.M., Lamers, H.J.G.L.M., Waelkens, C., Geballe, T. R. & Thé, P. S. 1991, A&A Supp., 87, 361 Google Scholar
van der Veen, W.E.C.J. Waters, L.B.F.M., Trams, N. R. & Matthews, H. E. 1994, A&A, 285, 551 Google Scholar
Waelkens, C., Lamers, H.J.G.L.M., Waters, L.B.F.M., Rufener, F., Trams, N. R., Le Bertre, T., Ferlet, R. & Vidal-Madjar, A. 1991, A&A, 242, 433 Google Scholar
Waelkens, C., Van Winckel, H., Waters, L.B.F.M. & Bakker, E. J. 1996, A&A, 314, L17 Google Scholar
Waters, L.B.F.M., Trams, N. R. & Waelkens, C. 1992, A&A, 262, L37 Google Scholar
Waters, L.B.F.M., Waelkens, C., Mayor, M. & Trams, N. R. 1993a, A&A, 269, 242 Google Scholar
Waters, L.B.F.M., Waelkens, C. & Trams, N. R. 1993b, in Mass Loss on the AGB and Beyond, ed. Schwarz, H. E. (European Southern Observatory), p. 298 Google Scholar