The period–luminosity relation for δ Scuti stars using Gaia DR2 parallaxes
Article
Article Title | The period–luminosity relation for δ Scuti stars using Gaia DR2 parallaxes |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Ziaali, Elham (Author), Bedding, Timothy R. (Author), Murphy, Simon J. (Author), Van Reeth, Timothy (Author) and Hey, Daniel R. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 486 (3), pp. 4348-4353 |
Number of Pages | 6 |
Year | 2019 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stz1110 |
Web Address (URL) | https://academic.oup.com/mnras/article/486/3/4348/5475657 |
Abstract | We have examined the period–luminosity (P–L) relation for δ Scuti stars using Gaia DR2 parallaxes. We included 228 stars from the catalogue of Rodríguez et al., as well as 1124 stars observed in the 4-yr Kepler mission. For each star, we considered the dominant pulsation period, and used DR2 parallaxes and extinction corrections to determine absolute V magnitudes. Many stars fall along a sequence in the P–L relation coinciding with fundamental-mode pulsation, while others pulsate in shorter period overtones. The latter stars tend to have higher effective temperatures, consistent with theoretical calculations. Surprisingly, we find an excess of stars lying on a ridge with periods half that of the fundamental. We suggest this may be due to a 2:1 resonance between the third or fourth overtone and the fundamental mode. |
Keywords | parallaxes; stars: oscillations; stars: variables: Scuti; Astrophysics - Solar and Stellar Astrophysics |
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 ©: 2019 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | Research Institute for Astronomy and Astrophysics of Maragha, Iran |
University of Sydney | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q73wx/the-period-luminosity-relation-for-scuti-stars-using-gaia-dr2-parallaxes
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