Unusual high-frequency oscillations in the Kepler δ Scuti star KIC 4840675
Article
Article Title | Unusual high-frequency oscillations in the Kepler δ Scuti star KIC 4840675 |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Balona, L. A. (Author), Breger, M. (Author), Catanzaro, G. (Author), Cunha, M. S. (Author), Handler, G. (Author), Kolaczkowski, Z. (Author), Kurtz, D. W. (Author), Murphy, S. (Author), Niemczura, E. (Author), Paparo, M. (Author), Smalley, B. (Author), Szabo, R. (Author), Uytterhoeven, K. (Author), Christiansen, J. L. (Author), Uddin, K. (Author) and Stumpe, M. C. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 424 (2), pp. 1187-1196 |
Number of Pages | 10 |
Year | 2012 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1111/j.1365-2966.2012.21295.x |
Web Address (URL) | https://academic.oup.com/mnras/article/424/2/1187/998823 |
Abstract | We show that the star KIC 4840675 observed by Kepler is composed of three stars with a rapidly rotating A-type star and two solar-type fainter companions. The A-type star is a δ Scuti variable with a dominant mode and many other modes of lower amplitude, including several low-frequency variations. The low-frequency variation with highest amplitude can be interpreted as rotational modulation with the light curve changing with time. However, the most interesting aspect of this star is a triplet of independent modes in the range 118–129 d−1 (1.4–1.5 mHz), which is far outside the range of typical δ Scuti frequencies. We discuss the possibility that these modes could be solar-like oscillations, oscillations of the roAp type or due to an unseen pulsating compact companion. |
Keywords | Asteroseismology; Binaries: spectroscopic; Stars: individual: KIC4840675; Stars: oscillations; Stars: variables: δ Scuti |
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 ©: 2012 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | South African Astronomical Observatory, South Africa |
University of Texas, United States | |
National Institute for Astrophysics, Italy | |
University of Porto, Portugal | |
Nicolaus Copernicus Astronomical Center, Poland | |
Wroclaw University, Poland | |
University of Central Lancashire, United Kingdom | |
Konkoly Observatory, Hungary | |
Keele University, United Kingdom | |
Institute of Astrophysics of the Canary Islands, Spain | |
NASA Ames Research Center, United States | |
National Aeronautics and Space Administration (NASA), United States | |
SETI Institute, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q736z/unusual-high-frequency-oscillations-in-the-kepler-scuti-star-kic-4840675
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