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A search for correlations between Wolf-Rayet stochastic wind variability and stellar parameters

Published online by Cambridge University Press:  29 August 2024

Guillaume Lenoir-Craig Open the ORCID record for Guillaume Lenoir-Craig [Opens in a new window] ,
Nicole St-Louis Open the ORCID record for Nicole St-Louis [Opens in a new window] ,
Anthony F. J. Moffat  and
Herbert Pablo
Guillaume Lenoir-Craig*
Affiliation:
Centre de Recherche en Astrophysique du Québec, Département de physique, Université de Montréal, Complexe des Sciences, Montréal, QC H2V 0B3, Canada
Nicole St-Louis
Affiliation:
Centre de Recherche en Astrophysique du Québec, Département de physique, Université de Montréal, Complexe des Sciences, Montréal, QC H2V 0B3, Canada
Anthony F. J. Moffat
Affiliation:
Centre de Recherche en Astrophysique du Québec, Département de physique, Université de Montréal, Complexe des Sciences, Montréal, QC H2V 0B3, Canada
Herbert Pablo
Affiliation:
American Association of Variable Star Observers, 49 Bay State Road, Cambridge, MA 02138, USA
*
email: guillaume.lenoir-craig@umontreal.ca
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Abstract

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We present the results of our analysis of 122 light-curves from 50 Wolf-Rayet (WR) stars using a red+white noise analysis, where we compare the fitted red noise features with stellar parameters to assess the presence of correlations with stellar parameters. A significant correlation between the amplitude of variability α0 and v∞ was found for the whole sample, along with several other correlations satisfying the Spearman-Rank p<0.001 criterion for both He-burning and WNh stars. Our results are compatible with several plausible processes that can have an influence on the level of variability in the winds of these stars, including a subsurface convection zone and core-generated internal gravity waves.

Keywords

stars: Wolf-Rayetstars: fundamental parametersstars: variablesstars: interiors
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S361: Massive Stars Near and Far , May 2022 , pp. 507 - 509
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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), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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