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- No 3 - 41st Liège International Astrophysical Coll...
- Caught in flagrante delicto: Evidence for Past Mass Transfer in Massive Binaries?
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Caught in flagrante delicto: Evidence for Past Mass Transfer in Massive Binaries?
Document(s) associé(s)
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Beaucoup de systèmes binaires massifs traversent des épisodes de transfert de masse et de moment angulaire au cours de leur évolution. Ce type d’interaction affecte les propriétés des deux étoiles (donneur de masse et accréteur) et devrait imprégner plusieurs signatures observationnelles. Parmi les indices les plus probants d’un épisode passé d’échange de matière, il y a la rotation rapide de l’accréteur et la composition chimique altérée du donneur de masse. Des études observationnelles quantitatives de binaires massives évoluées sont cruciales pour contraindre certains paramètres clés des modèles d’évolution, tels que la fraction de la matière perdue par le donneur qui est effectivement accrétée par le compagnon. Toutefois, ce type d’étude requiert une analyse en profondeur de tous les aspects d’un système binaire, ce qui conduit parfois à des résultats inattendus. Dans cette contribution, nous passons en revue les indices observationnels d’épisodes passés d’échanges de masse dans des binaires massives de la séquence principale ou ayant quitté celle-ci récemment.
Abstract
Many massive binary systems undergo mass and angular momentum transfer over the course of their evolution. This kind of interaction is expected to deeply affect the properties of the mass donor and mass gainer and to leave various observational signatures. The most common smoking guns of a past mass transfer episode are notably rapid rotation of the mass gainer and altered surface chemical abundances of the stripped mass donor star. Quantitative observational studies of evolved massive binaries are crucial to gain insight into poorly constrained parameters of binary evolution models such as the fraction of mass lost by the mass donor that is actually accreted by the mass gainer. Yet, drawing conclusions about a past mass transfer episode requires a detailed analysis of all aspects of a binary system which sometimes leads to unexpected results. In this contribution, we review the existing observational evidence for past mass exchange events in massive main-sequence and post main-sequence binaries.
This work is distributed under the Creative Commons CC BY 4.0 Licence.
Paper presented at the 41st Liège International Astrophysical Colloquium on “The eventful life of massive star multiples,” University of Liège (Belgium), 15–19 July 2024.
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A propos de : Gregor Rauw
email : g.rauw@uliege.be