Unusual high-frequency oscillations in the KeplerScuti star KIC4840675

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, M. C. Stumpe

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We show that the star KIC4840675 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 δScuti 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 118-129d -1 (1.4-1.5mHz), which is far outside the range of typical δScuti 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.

Original languageEnglish
Pages (from-to)1187-1196
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume424
Issue number2
DOIs
Publication statusPublished - Aug 1 2012

Keywords

  • Asteroseismology
  • Binaries: spectroscopic
  • Stars: individual: KIC4840675
  • Stars: oscillations
  • Stars: variables: δScuti

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Balona, L. A., Breger, M., Catanzaro, G., Cunha, M. S., Handler, G., Kołaczkowski, Z., Kurtz, D. W., Murphy, S., Niemczura, E., Paparó, M., Smalley, B., Szabó, R., Uytterhoeven, K., Christiansen, J. L., Uddin, K., & Stumpe, M. C. (2012). Unusual high-frequency oscillations in the KeplerScuti star KIC4840675. Monthly Notices of the Royal Astronomical Society, 424(2), 1187-1196. https://doi.org/10.1111/j.1365-2966.2012.21295.x