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Granulation in Red Supergiants: The Scaling Relations

Published online by Cambridge University Press:  06 February 2024

Yi Ren Open the ORCID record for Yi Ren [Opens in a new window] ,
Zehao Zhang ,
Biwei Jiang Open the ORCID record for Biwei Jiang [Opens in a new window] ,
Igor Soszyński Open the ORCID record for Igor Soszyński [Opens in a new window]  and
Tharindu Jayasinghe
Yi Ren*
Affiliation:
College of Physics and Electronic Engineering, Qilu Normal University, Jinan 250200, China
Zehao Zhang
Affiliation:
Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University, Beijing 102206, China Department of Astronomy, Beijing Normal University, Beijing 100875, China
Biwei Jiang*
Affiliation:
Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University, Beijing 102206, China Department of Astronomy, Beijing Normal University, Beijing 100875, China
Igor Soszyński
Affiliation:
Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
Tharindu Jayasinghe
Affiliation:
Department of Astronomy, University of California Berkeley, Berkeley CA 94720, USA NASA Hubble Fellow
*
email: yiren@qlnu.edu.cn
email: bjiang@bnu.edu.cn
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Abstract

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The evolution of granulation is an important mechanism of the light variations of red supergiants (RSGs). Based on pure and complete samples of RSGs in the Magellanic Clouds, the mechanisms and characteristics of the granulation of RSGs are investigated based on time-series data. As predicted by the basic physical process of granulation and previous works, there are tight relations between granulation and stellar parameters of RSGs (i.e., the scaling relations). The scaling relations of RSGs provide a new method to infer stellar parameters by using the characteristic timescale and amplitude of granulations. Some faint sources deviate from the scaling relations, which may be due to the difference in the properties of the granulation of the RSGs before and after the blue loop or contamination by Mira variables. However, both of these possibilities suggest that the scaling relations of granulation is different among different types of stars.

Keywords

Red supergiant starsStellar pulsationsStellar oscillationsLate-type stars
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S376: At the crossroads of astrophysics and cosmology: Period–luminosity relations in the 2020s , December 2022 , pp. 195 - 204
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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 (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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