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Learning about AGB stars by studying the stars polluted by their outflows

Published online by Cambridge University Press:  30 November 2022

Ana Escorza Open the ORCID record for Ana Escorza [Opens in a new window]  and
Robert J. De Rosa
Ana Escorza
Affiliation:
European Southern Observatory, Alonso de Córdova 3107, Vitacura, Santiago, Chile email: [email protected]
Robert J. De Rosa
Affiliation:
European Southern Observatory, Alonso de Córdova 3107, Vitacura, Santiago, Chile email: [email protected]
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Abstract

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A rich zoo of peculiar objects forms when Asymptotic Giant Branch (AGB) stars, undergo interactions in a binary system. For example, Barium (Ba) stars are main-sequence and red-giant stars that accreted mass from the outflows of a former AGB companion, which is now a dim white dwarf (WD). Their orbital properties can help us constrain AGB binary interaction mechanisms and their chemical abundances are a tracer of the nucleosynthesis processes that took place inside the former AGB star. The observational constraints concerning the orbital and stellar properties of Ba stars have increased in the past years, but important uncertainties remained concerning their WD companions. In this contribution, we used HD 76225 to demonstrate that by combining radial-velocity data with Hipparcos and Gaia astrometry, one can accurately constrain the orbital inclinations of these systems and obtain the absolute masses of these WDs, getting direct information about their AGB progenitors via initial-final mass relationships.

Keywords

white dwarfsstars: late-typestars: chemically peculiarbinaries: spectroscopicastrometry - stars: evolution
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S366: The Origin of Outflows in Evolved Stars , November 2020 , pp. 253 - 258
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Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of International Astronomical Union

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