Period spacings of γ Doradus pulsators in the Kepler field: detection methods and application to 22 slow rotators
Article
Article Title | Period spacings of γ Doradus pulsators in the Kepler field: detection methods and application to 22 slow rotators |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Li, Gang (Author), Bedding, Timothy R. (Author), Murphy, Simon J. (Author), Van Reeth, Timothy (Author), Antoci, Victoria (Author) and Ouazzani, Rhita-Maria (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 482 (2), pp. 1757-1785 |
Number of Pages | 29 |
Year | 2018 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/sty2743 |
Web Address (URL) | https://academic.oup.com/mnras/article/482/2/1757/5127051 |
Abstract | In γ Doradus (γ Dor) stars, the g-mode period spacing shows an approximately linear relation with period. The slope is a new asteroseismic diagnostic, related to the rotation rate and the azimuthal order m. We report two automated methods, the ‘moving-window Fourier transform’ and the ‘cross-correlation’, to detect and measure the period spacings based on 4-yr light curves from the Kepler satellite. The results show that the cross-correlation method performs better at detecting the period spacings and their slopes. In this paper, we apply our method to 22 γ Dor stars with g-mode multiplets split by rotation. The rotation periods are similar to the g-mode period spacings, causing the multiplets to overlap. To clarify the overlapping patterns, we use the échelle diagram and introduce a ‘copy-shift’ diagram to discern and measure the splittings. The first observational relation between slopes and splittings is shown. The slope deviates from zero when the splitting increases, as the theory predicts. We found that what appears to be rotational splittings in two stars is in fact caused by two nearly identical overlapping patterns from binaries. |
Keywords | Asteroseismology; Stars: rotation; Stars: variables: general; 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 ©: 2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | University of Sydney |
Aarhus University, Denmark | |
Sorbonne University, France | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q7392/period-spacings-of-doradus-pulsators-in-the-kepler-field-detection-methods-and-application-to-22-slow-rotators
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