Gaia-derived luminosities of Kepler A/F stars and the pulsator fraction across the δ Scuti instability strip
Article
Article Title | Gaia-derived luminosities of Kepler A/F stars and the pulsator fraction across the δ Scuti instability strip |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Murphy, Simon J. (Author), Hey, Daniel (Author), Van Reeth, Timothy (Author) and Bedding, Timothy R. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 485 (2), pp. 2380-2400 |
Number of Pages | 21 |
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/stz590 |
Web Address (URL) | https://academic.oup.com/mnras/article/485/2/2380/5368359 |
Abstract | We study the fraction of stars in and around the δ Scuti instability strip that are pulsating, using Gaia DR2 parallaxes to derive precise luminosities. We classify a sample of over 15 000 Kepler A and F stars into δ Sct and non-δ Sct stars, paying close attention to variability that could have other origins. We find that 18 per cent of the δ Sct stars have their dominant frequency above the Kepler long-cadence Nyquist frequency (periods < 1 h), and 30 per cent have some super-Nyquist variability. We analyse the pulsator fraction as a function of effective temperature and luminosity, finding that many stars in the δ Sct instability strip do not pulsate. The pulsator fraction peaks at just over 70 per cent in the middle of the instability strip. The results are insensitive to the amplitude threshold used to identify the pulsators. We define a new empirical instability strip based on the observed pulsator fraction that is systematically hotter than theoretical strips currently in use. The stellar temperatures, luminosities, and pulsation classifications are provided in an online catalogue. |
Keywords | asteroseismology, parallaxes, Hertzsprung-Russell and colour-magnitude diagrams, stars: oscillations, stars: variables: δ 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 | University of Sydney |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q73q9/gaia-derived-luminosities-of-kepler-a-f-stars-and-the-pulsator-fraction-across-the-scuti-instability-strip
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