Unusual high-frequency oscillations in the Kepler δ Scuti star KIC 4840675

Balona, L. A. and Breger, M. and Catanzaro, G. and Cunha, M. S. and Handler, G. and Kolaczkowski, Z. and Kurtz, D. W. and Murphy, S. and Niemczura, E. and Paparo, M. and Smalley, B. and Szabo, R. and Uytterhoeven, K. and Christiansen, J. L. and Uddin, K. and Stumpe, M. C. (2012) Unusual high-frequency oscillations in the Kepler δ Scuti star KIC 4840675. Monthly Notices of the Royal Astronomical Society, 424 (2). pp. 1187-1196. ISSN 0035-8711

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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.

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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: 02 May 2022 23:39
Last Modified: 02 May 2022 23:39
Uncontrolled Keywords: Asteroseismology; Binaries: spectroscopic; Stars: individual: KIC4840675; Stars: oscillations; Stars: variables: δ Scuti
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/10.1111/j.1365-2966.2012.21295.x
URI: http://eprints.usq.edu.au/id/eprint/47860

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