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Long-term light curve variations of AGB stars: episodic mass-loss or binarity?

Published online by Cambridge University Press:  30 November 2022

Roberto Ortiz Open the ORCID record for Roberto Ortiz [Opens in a new window] ,
Alain Jorissen  and
Léa Planquart Open the ORCID record for Léa Planquart [Opens in a new window]
Roberto Ortiz
Affiliation:
Escola de Artes, Ciências & Humanidades, Universidade de São Paulo, Brazil email: rortiz@usp.br
Alain Jorissen
Affiliation:
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, Belgium emails: Alain.Jorissen@ulb.be, lea.planquart@ulb.be
Léa Planquart
Affiliation:
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, Belgium emails: Alain.Jorissen@ulb.be, lea.planquart@ulb.be
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Abstract

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A significant fraction of the stars near the tip of the AGB phase become regular or semi-regular (Mira-type, SRs) pulsators. However, some of these light curves have shown intriguing secondary minima or sharp dips with much longer periods. Although this phenomenon shows some resemblance with the R CrB variables, the light curve is generally symmetric before and after the dip, whereas in R CrB the luminosity recovers slower after its minimum. More recently, high-resolution ALMA CO observations revealed a spiral structure around some of these stars, which suggests the presence of a stellar or sub-stellar companion. In these cases, the long-term light curve minima could be caused by periodic eclipses of the primary by a spiral circumstellar structure, and the long-period would be related to the orbital period. In this paper we discuss the pros and cons of the various proposed scenarios for the long-term minima of pulsating AGB stars.

Keywords

AGB starsvariable starsbinariesmass-loss
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S366: The Origin of Outflows in Evolved Stars , November 2020 , pp. 184 - 189
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Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of International Astronomical Union

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