2012MNRAS.424.1187B

Query : 2012MNRAS.424.1187B

2012MNRAS.424.1187B - Mon. Not. R. Astron. Soc., 424, 1187-1196 (2012/August-1)

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

BALONA L.A., BREGER M., CATANZARO G., CUNHA M.S., HANDLER G., KOLACZKOWSKI Z., KURTZ D.W., MURPHY S., NIEMCZURA E., PAPARO M., SMALLEY B., SZABO R., UYTTERHOEVEN K., CHRISTIANSEN J.L., UDDIN K. and STUMPE M.C.

Abstract (from CDS):

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.

Based on observations made with the Nordic Optical Telescope, operated jointly by Denmark, Finland, Iceland, Norway and Sweden, on the island of La Palma at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofìsica de Canarias (IAC).


Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): asteroseismology - binaries: spectroscopic - stars: individual: KIC 4840675 - stars: oscillations - stars: variables: δ Scuti

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* ZZ Cet WD* 01 36 13.6153974672 -11 20 32.632874601   14.328 14.16 14.4   DA4.0 307 0
2 V* CP Oct dS* 03 09 53.7500021592 -83 31 53.581689012   8.01 7.61     F2/3Ib/II 66 0
3 GD 358 WD* 16 47 18.3925183824 +32 28 32.862804384 12.511 13.530 13.653 13.752 13.852 DB2 364 0
4 BD+39 3810 dS* 19 32 57.9302113296 +39 58 45.250280976   10.04 9.66     A5Vnn 19 0
5 HD 187547 dS* 19 48 36.5086728312 +43 06 32.248807704   8.66 8.40     A4Vm 39 0

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