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Long-Period Variables as distance and age indicators in the era of Gaia and LSST

Published online by Cambridge University Press:  06 February 2024

Michele Trabucchi Open the ORCID record for Michele Trabucchi [Opens in a new window]
Michele Trabucchi*
Affiliation:
Dipartimento di Fisica e Astronomia Galileo Galilei, Università degli studi di Padova, Vicolo dell’Osservatorio 3, I-35122 Padova, Italy Department of Astronomy, University of Geneva, Ch. Pegasi 51, 1920 Versoix, Switzerland
*
email: [email protected]
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Abstract

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Long-period variables are bright, evolved red giant stars showing periodic photometric changes due to stellar pulsation. They follow one or more period-luminosity and period-age relations, which make them highly promising distance indicators and tracers of young and intermediate-age stellar populations. Such a potential is especially interesting in view of the massive amount of data delivered by modern large-scale variability surveys. Crucially, these applications require a clear theoretical understanding of pulsation physics in connection with stellar evolution. Here, I describe an ongoing effort from our collaboration dedicated to the modelling of stellar pulsation in evolved stars, and how this work is impacting our capability of investigating long-period variables and exploiting them for other astrophysical studies. Furthermore, I present our ongoing work aimed at assessing the potential of semi-regular variables, an often neglected sub-type of long-period variables, to be distance indicators complementary to their better-known, more evolved counterparts, the Mira variables.

Keywords

stars: AGB and post-AGB starsstars: oscillationsstars: variables: generalstars: distances
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. 306 - 318
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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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