Revisiting bright δ Scuti stars and their period–luminosity relation with TESS and Gaia DR3
Article
Article Title | Revisiting bright δ Scuti stars and their period–luminosity relation with TESS and Gaia DR3 |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Barac, Natascha, Bedding, Timothy R., Murphy, Simon J. and Hey, Daniel R. |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 516 (2), pp. 2080-2094 |
Number of Pages | 15 |
Year | 2022 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stac2132 |
Web Address (URL) | https://academic.oup.com/mnras/article-abstract/516/2/2080/6652514?redirectedFrom=fulltext |
Abstract | We have used NASA’s TESS mission to study catalogued δ Scuti stars. We examined TESS light curves for 434 stars, including many for which few previous observations exist. We found that 62 are not δ Scuti pulsators, with most instead showing variability from binarity. For the 372 δ Scuti stars, we provide a catalogue of the period and amplitude of the dominant pulsation mode. Using Gaia DR3 parallaxes, we place the stars in the period–luminosity (P–L) diagram and confirm previous findings that most stars lie on a ridge that corresponds to pulsation in the fundamental radial mode, and that many others fall on a second ridge that is a factor two shorter in period. This second ridge is seen more clearly than before, thanks to the revised periods and distances. We demonstrate the value of the P–L diagram in distinguishing δ Scuti stars from short-period RR Lyrae stars, and we find several new examples of high-frequency δ Scuti stars with regular sequences of overtone modes, including XX Pyx and 29 Cyg. Finally, we revisit the sample of δ Scuti stars observed by Kepler and show that they follow a tight period–density relation, with a pulsation constant for the fundamental mode of Q = 0.0315 d. |
Keywords | parallaxes ; stars: oscillations; stars: variables: δ Scuti |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: © 2022 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | University of Pennsylvania, United States |
University of Sydney | |
Aarhus University, Denmark | |
Centre for Astrophysics | |
University of Hawaii, United States |
https://research.usq.edu.au/item/z01q2/revisiting-bright-scuti-stars-and-their-period-luminosity-relation-with-tess-and-gaia-dr3
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