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Post-RGB and Post-AGB stars as tracers of binary evolution

Published online by Cambridge University Press:  30 December 2019

Devika Kamath
Devika Kamath*
Affiliation:
Department of Physics and Astronomy, Macquarie University, Sydney, Australia Astronomy, Astrophysics and Astrophotonics Research Centre, Macquarie University, Sydney, Australia email: devika.kamath@mq.edu.au
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Abstract

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Binary interactions can alter the intrinsic properties of stars (such as: pulsation, mass-loss, photospheric chemistry, dust-formation, circumstellar envelope morphology etc.) and can even play a dominant role in determining its ultimate fate. While past studies have shown that binarity can end the AGB life of a star, recent studies have revealed that in specific cases binarity also pre-maturely terminate the RGB evolution. A characteristic feature of evolved binaries is the presence of a Keplerian circumbinary disc of gas and dust which plays a lead role in the evolution of the systems. In this article, I will review our advances in the research landscape of post-RGB and post-AGB binary stars, focussing on their observational properties, spectral energy distribution, photospheric chemistry, the evolution of their stable circumbinary discs, and the evolutionary connection between the enigmatic post-AGB/post-RGB binaries, and other systems whose primary component is a white dwarf.

Keywords

stars: AGB and post-AGBstars: binariesstars: evolutionstars: fundamental parametersstars: chemically peculiarGalaxy: stellar contentgalaxies: Magellanic Clouds
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 209 - 219
Copyright
© International Astronomical Union 2019 

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