Circumbinary Discs Around Post-AGB Binary Stars: a Common Phenomenon

Details Circumbinary Discs Around Post-AGB Binary Stars: a Common Phenomenon Circumbinary Discs Around Post-AGB Binary Stars: a Common Phenomenon

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1001..349v&link_type=abstract

IXTH TORINO WORKSHOP ON EVOLUTION AND NUCLEOSYNTHESIS IN AGB STARS AND THE IIND PERUGIA WORKSHOP ON NUCLEAR ASTROPHYSICS. AIP C

Astronomy and Astrophysics

Astrophysics

1

Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages, Giant And Subgiant Stars, Spectroscopic Binaries, Close Binaries, Circumstellar Shells, Clouds, And Expanding Envelopes, Circumstellar Masers, Abundances, Chemical Composition

Scientific paper

In this contribution we report on the results of our studies on the diverse impact of the circumstellar material on the evolution of binary post-AGB stars. Binary post-AGB stars are common and thanks to our radial velocity monitoring program we could identify the binary observables (period, eccentricity, mass function) of a significant fraction of the whole Galactic sample. We argue that the circumstellar material around all the studied objects is dominated by a circumbinary disc. Using the newly available interferometric capabilities at ESO, we were able to resolve the discs and study their structure in detail. We argue that the discs are stable and in hydrostatic equilibrium. The impact of the disc on the evolution of the system can hardly be overestimated and the formation and evolution of the disc has a fundamental impact on the evolution of the system. We touch upon the poorly understood connection between the binary post-AGB stars and the other groups of evolved binaries.

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