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

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Balona, LA (Author) Other; Breger, M (Author) Other; Catanzaro, G (Author) Other; Cunha, MS (Author) FCUP; Handler, G (Author) Other; Kolaczkowski, Z (Author) Other; Kurtz, DW (Author) Other; Murphy, S (Author) Other; Niemczura, E (Author) Other; Paparo, M (Author) Other; Smalley, B (Author) Other; Szabo, R (Author) Other; Uytterhoeven, K (Author) Other; Christiansen, JL (Author) Other; Uddin, K (Author) Other; Stumpe, MC (Author) Other

Journal

Title: Monthly Notices of the Royal Astronomical Society

Vol. 424

Pages: 1187-1196

ISSN: 0035-8711

Publisher: Oxford University Press

Indexing

ISI Web of Knowledge - 8 Citations

Scopus - 7 Citations

Other information

Authenticus ID: P-002-7N5

DOI: 10.1111/j.1365-2966.2012.21295.x

Abstract (EN): 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 d 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 118129 d-1 (1.41.5 mHz), which is far outside the range of typical d 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10