An astrophysical interpretation of the remarkable g-mode frequency groups of the rapidly rotating γ Dor star, KIC 5608334
Article
Article Title | An astrophysical interpretation of the remarkable g-mode frequency groups of the rapidly rotating γ Dor star, KIC 5608334 |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Saio, Hideyuki (Author), Bedding, Timothy R. (Author), Kurtz, Donald W. (Author), Murphy, Simon J. (Author), Antoci, Victoria (Author), Shibahashi, Hiromoto (Author), Li, Gang (Author) and Takata, Masao (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 477 (2), pp. 2183-2195 |
Number of Pages | 13 |
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/sty784 |
Web Address (URL) | https://academic.oup.com/mnras/article/477/2/2183/4956530 |
Abstract | The Fourier spectrum of the γ-Dor variable KIC 5608334 shows remarkable frequency groups at ∼3, ∼6, ∼9, and 11–12 d−1. We explain the four frequency groups as prograde sectoral g modes in a rapidly rotating star. Frequencies of intermediate-to-high radial order prograde sectoral g modes in a rapidly rotating star are proportional to |m| (i.e. ν ∝ |m|) in the corotating frame as well as in the inertial frame. This property is consistent with the frequency groups of KIC 5608334 as well as the period versus period-spacing relation present within each frequency group, if we assume a rotation frequency of 2.2 d−1, and that each frequency group consists of prograde sectoral g modes of |m| = 1, 2, 3, and 4, respectively. In addition, these modes naturally satisfy near-resonance conditions νi ≈ νj + νk with mi = mj + mk. We even find exact resonance frequency conditions (within the precise measurement uncertainties) in many cases, which correspond to combination frequencies. |
Keywords | Asteroseismology; Stars: Individual: (KIC 5608334); Stars: Oscillations; Stars: Rotation; Stars: Variables; 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 | Tohoku University, Japan |
University of Sydney | |
University of Central Lancashire, United Kingdom | |
Aarhus University, Denmark | |
University of Tokyo, Japan | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q73vv/an-astrophysical-interpretation-of-the-remarkable-g-mode-frequency-groups-of-the-rapidly-rotating-dor-star-kic-5608334
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