Journal Article

Unusual high-frequency oscillations in the <i>Kepler</i> δ Scuti star KIC 4840675

L. A. Balona, M. Breger, G. Catanzaro, M. S. Cunha, G. Handler, Z. Kołaczkowski, D. W. Kurtz, S. Murphy, E. Niemczura, M. Paparó, B. Smalley, R. Szabó, K. Uytterhoeven, J. L. Christiansen, K. Uddin and M. C. Stumpe

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 424, issue 2, pages 1187-1196
Published in print August 2012 | ISSN: 0035-8711
Published online August 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.21295.x
Unusual high-frequency oscillations in the Kepler δ Scuti star KIC 4840675

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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: KIC 4840675; stars: oscillations; stars: variables: δ Scuti

Journal Article.  7823 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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