The period–luminosity relation for δ Scuti stars using Gaia DR2 parallaxes

Ziaali, Elham and Bedding, Timothy R. and Murphy, Simon J. and Van Reeth, Timothy and Hey, Daniel R. (2019) The period–luminosity relation for δ Scuti stars using Gaia DR2 parallaxes. Monthly Notices of the Royal Astronomical Society, 486 (3). pp. 4348-4353. ISSN 0035-8711

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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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: File reproduced in accordance with the copyright policy of the publisher/author.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 14 Jul 2022 04:00
Last Modified: 17 Jul 2022 23:56
Uncontrolled Keywords: parallaxes; stars: oscillations; stars: variables: Scuti; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.1093/mnras/stz1110
URI: http://eprints.usq.edu.au/id/eprint/47974

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