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The PL diagram for δ Sct stars: back in business as distance estimators

Published online by Cambridge University Press:  06 February 2024

Antonio Garca Hernández Open the ORCID record for Antonio Garca Hernández [Opens in a new window] ,
Javier Pascual-Granado ,
Mariel Lares-Martiz ,
Giovanni M. Mirouh ,
Juan Carlos Suárez ,
Sebastiá Barceló Forteza  and
Andrés Moya
Antonio Garca Hernández*
Affiliation:
Departamento de Fsica Teórica y del Cosmos, Universidad de Granada, Campus de Fuentenueva s/n, 18071, Granada, Spain
Javier Pascual-Granado
Affiliation:
Instituto de Astrofsica de Andaluca (CSIC). Glorieta de la Astronoma s/n. 18008, Granada, Spain
Mariel Lares-Martiz
Affiliation:
Instituto de Astrofsica de Andaluca (CSIC). Glorieta de la Astronoma s/n. 18008, Granada, Spain
Giovanni M. Mirouh
Affiliation:
Departamento de Fsica Teórica y del Cosmos, Universidad de Granada, Campus de Fuentenueva s/n, 18071, Granada, Spain
Juan Carlos Suárez
Affiliation:
Departamento de Fsica Teórica y del Cosmos, Universidad de Granada, Campus de Fuentenueva s/n, 18071, Granada, Spain
Sebastiá Barceló Forteza
Affiliation:
Departamento de Fsica Teórica y del Cosmos, Universidad de Granada, Campus de Fuentenueva s/n, 18071, Granada, Spain
Andrés Moya
Affiliation:
Departament d’Astronomia i Astrofsica, Universitat de València, C. Dr. Moliner 50, 46100, Burjassot, Spain
*
email: agh@ugr.es
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Abstract

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In this work, we focus on the period-luminosity relation (PLR) of δ Sct stars, in which mode excitation and selection mechanisms are still poorly constrained, and whose structure and oscillations are affected by rotation. We review the PLRs in the recent literature, and add a new inference from a large sample of δ Sct. We highlight the difficulty in identifying the fundamental mode and show that rotation-induced surface effects can impact the measured luminosities, explaining the broadening of the PLR. We derive a tight relation between the low-order large separation and the fundamental radial mode frequency (F0) that holds for rotating stars, thus paving the way towards mode identification. We show that the PLRs we obtain for different samples are compatible with each other and with the recent literature, and with most observed δ Sct stars when taking rotation effects into account. We also find that the highest-amplitude peak in the frequency spectrum corresponds to the fundamental modein most δ Sct, thus shedding some light on their elusive mode selection mechanism.

Keywords

Period-luminosity relationsδ Sct starsStellar pulsationsStellar rotationMode identification
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. 239 - 249
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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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