Asteroseismology of KIC 11754974: a high-amplitude SX Phe pulsator in a 343-d binary system
Article
Article Title | Asteroseismology of KIC 11754974: a high-amplitude SX Phe pulsator in a 343-d binary system |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Murphy, S. J. (Author), Pigulski, A. (Author), Kurtz, D. W. (Author), Suarez, J. C. (Author), Handler, G. (Author), Balona, L. A. (Author), Smalley, B. (Author), Uytterhoeven, K. (Author), Szabo, R. (Author), Thygesen, A. O. (Author), Elkin, V. (Author), Breger, M. (Author), Grigahcene, A. (Author), Guzik, J. A. (Author), Nemec, J. M. (Author) and Southworth, J. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 432 (3), pp. 2284-2297 |
Number of Pages | 14 |
Year | 2013 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stt587 |
Web Address (URL) | https://academic.oup.com/mnras/article/432/3/2284/1748282 |
Abstract | The candidate SX Phe star KIC 11754974 shows a remarkably high number of combination frequencies in the Fourier amplitude spectrum: 123 of the 166 frequencies in our multifrequency fit are linear combinations of independent modes. Predictable patterns in frequency spacings are seen in the Fourier transform of the light curve. We present an analysis of 180 d of short-cadence Kepler photometry and of new spectroscopic data for this evolved, late A-type star. We infer from the 1150-d, long-cadence light curve, and in two different ways, that our target is the primary of a 343-d, non-eclipsing binary system. According to both methods, the mass function is similar, f (M) = 0.0207 ± 0.0003M⊙. The observed pulsations are modelled extensively, using separate, state-of-the-art, time-dependent convection (TDC) and rotating models. The models match the observed temperature and low metallicity, finding a mass of 1.50-1.56M⊙. The models suggest that the whole star is metal poor, and that the low metallicity is not just a surface abundance peculiarity. This is the best frequency analysis of an SX Phe star, and the only Kepler δ Sct star to be modelled with both TDC and rotating models. |
Keywords | Asteroseismology; Stars: individual: KIC 11754974; Stars: oscillations; Stars: population II; Stars: variables: δ scuti; Astrophysics - Solar and Stellar Astrophysics |
Related Output | |
Is obsoleted by | Erratum: Asteroseismology of KIC 11754974: a high-amplitude SX Phe pulsator in a 343-d binary system |
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 ©: 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | University of Central Lancashire, United Kingdom |
Wroclaw University, Poland | |
Institute of Astrophysics of Andalusia, Spain | |
Nicolaus Copernicus Astronomical Center, Poland | |
South African Astronomical Observatory, South Africa | |
Keele University, United Kingdom | |
Institute of Astrophysics of the Canary Islands, Spain | |
Konkoly Observatory, Hungary | |
Heidelberg University, Germany | |
University of Vienna, Austria | |
Los Alamos National Laboratory, United States | |
Camosun College, Canada | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q73v0/asteroseismology-of-kic-11754974-a-high-amplitude-sx-phe-pulsator-in-a-343-d-binary-system
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