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Deciphering hard disks

Published online by Cambridge University Press:  29 August 2024

Yaël Nazé Open the ORCID record for Yaël Nazé [Opens in a new window] ,
Gregor Rauw ,
Myron A. Smith  and
Christian Motch
Yaël Nazé*
Affiliation:
STAR Institute, Université de Liège, Allée du 6 août 19c, Bât B5c, 4000 Liège, Belgium FNRS Senior research associate
Gregor Rauw
Affiliation:
STAR Institute, Université de Liège, Allée du 6 août 19c, Bât B5c, 4000 Liège, Belgium
Myron A. Smith
Affiliation:
NSF OIR Lab, 950 N Cherry Ave, Tucson, AZ 85721, USA
Christian Motch
Affiliation:
CNRS, Obs. Ast. de Strasbourg, 11 rue de l’Université, F-67000 Strasbourg, France
*
email: ynaze@uliege.be
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Abstract

Some Be stars were found to emit very bright and extremely hard thermal X-rays. This so-called γ Cas -star category is rapidly growing, showing that the phenomenon is far from being uncommon and its consequences on Be population feedback should be examined. The origin of this X-ray peculiarity is however much debated. In this contribution, we review the most recent observational clues and derive constraints on the cause of the phenomenon: properties of these stars (multiplicity status, photometric variability), X-ray reaction to disk changes, impact of stripped-star companions on the X-ray emission,…

Keywords

stars: emission-line, Bestars: early-typeX-rays: stars
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S361: Massive Stars Near and Far , May 2022 , pp. 319 - 320
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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References

Nazé, Y., & Motch, C. 2018, A&A, 619, A148 Google Scholar
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Smith, M.A., Lopes de Oliveira, R., & Motch, C. 2016, Adv. in Sp. Res., 58, 782 CrossRefGoogle Scholar