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Clumping and X-rays in cool B Supergiants

Published online by Cambridge University Press:  16 August 2023

Matheus Bernini-Peron Open the ORCID record for Matheus Bernini-Peron [Opens in a new window] ,
W. L. F. Marcolino  and
A. A. C. Sander
Matheus Bernini-Peron
Affiliation:
Zentrum für Astronomie der Universität Heidelberg, Astronomisches Rechen-Institut Mönchhofstr. 12-14, 69120, Heidelberg, Germany email: matheus.bernini@uni-heidelberg.de
W. L. F. Marcolino
Affiliation:
Observatório do Valongo, Federal University of Rio de Janeiro, Ladeira do Pedro Antônio, 20080-090, Rio de Janeiro, Brazil
A. A. C. Sander
Affiliation:
Zentrum für Astronomie der Universität Heidelberg, Astronomisches Rechen-Institut Mönchhofstr. 12-14, 69120, Heidelberg, Germany email: matheus.bernini@uni-heidelberg.de
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Abstract

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B supergiants (BSGs) are evolved objects on the cool end of the line-driven wind regime. Studying their atmospheres provides important insights on the stellar wind physics of these objects and their evolutionary status. So far important features of their spectra, especially in the UV region, could not be reproduced consistently with atmosphere models. This translates directly into problems of our understanding of their wind properties. Here, we present new insights about the BSGs on the cooler side of the Bi-Stability Jump, corresponding to spectral types later than B1. Using UV and optical data, we analysed a sample of Galactic cool BSGs. Including for the first time X-rays and clumping the wind models, we show that the spectra of cool BSGs cannot be explained without X-rays, despite any clear detection of the target stars.

Keywords

stars: windsoutflowsstars: fundamental parametersultraviolet: starsX-rays: stars
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 17 , Symposium S370: Winds of Stars and Exoplanets , August 2021 , pp. 200 - 201
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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