2014A&A...563A..59M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST08:19:18

2014A&A...563A..59M - Astronomy and Astrophysics, volume 563A, 59-59 (2014/3-1)

KIC 3858884: a hybrid δ Scuti pulsator in a highly eccentric eclipsing binary.

MACERONI C., LEHMANN H., DA SILVA R., MONTALBAN J., LEE C.-U., AK H., DESHPANDE R., YAKUT K., DEBOSSCHER J., GUO Z., KIM S.-L., LEE J.W. and SOUTHWORTH J.

Abstract (from CDS):

Analysis of eclipsing binaries containing non-radial pulsators allows i) combining two different and independent sources of information on the internal structure and evolutionary status of the components and ii) studying the effects of tidal forces on pulsations. KIC 3858884 is a bright Kepler target whose light curve shows deep eclipses, complex pulsation patterns with pulsation frequencies typical of δ Sct, and a highly eccentric orbit. We present the result of the analysis of Kepler photometry and of high resolution phase-resolved spectroscopy. Spectroscopy yielded both the radial velocity curves and, after spectral disentangling, the primary-component effective temperature and metallicity, and line-of-sight projected rotational velocities. The Kepler light curve was analyzed with an iterative procedure that was devised to disentangle eclipses from pulsations and takes the visibility of the pulsating star into account during eclipses. The search for the best set of binary parameters was performed by combining the synthetic light curve models with a genetic minimization algorithm, which yielded a robust and accurate determination of the system parameters. The binary components have very similar masses (1.88 and 1.86M) and effective temperatures (6800 and 6600K), but different radii (3.45 and 3.05R). The comparison with the theoretical models showed a somewhat different evolutionary status of the components and the need to introduce overshooting in the models. The pulsation analysis indicates the hybrid nature of the pulsating (secondary) component, where the corresponding high order g-modes might be excited by an intrinsic mechanism or by tidal forces.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - binaries: spectroscopic - stars: fundamental parameters - stars: interiors - stars: oscillations - stars: individual: KIC 3858884

VizieR on-line data: <Available at CDS (J/A+A/563/A59): freqs.dat>

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * 21 Cas Al* 00 45 39.0741754240 +74 59 17.056290402   5.717 5.652     A2IV 199 0
2 CoRoT 102918586 EB* 06 48 54.3084 -00 52 22.875   12.74 12.32 12.34   A5IV 21 0
3 TYC 3130-2385-1 Al* 18 48 38.0889273281 +44 29 09.853475372   12.18 11.33     ~ 42 0
4 HD 174884 EB* 18 52 40.3070448846 +04 03 11.737986016   8.14 7.998     B8V 29 0
5 BD+48 2812 Al* 19 00 51.8894456315 +49 05 22.062636104   10.51 10.24     F0 27 0
6 ASAS J190333+3941.0 Al* 19 03 32.7241738858 +39 41 00.368014032   10.95 10.83   10.582 A3V 48 0
7 TYC 3547-2135-1 bL* 19 21 11.6185430446 +47 58 42.954059789   9.79 9.53   9.330 A5IV 43 0
8 BD+38 3661 Al* 19 34 46.9048624526 +38 58 58.050206206   9.72 9.28   8.942 F6II 36 0
9 HD 184884 * 19 36 08.0354991336 +11 09 00.595167819 6.860 6.790 6.710     A3V 18 1
10 BD+18 4914 dS* 22 02 37.6976881770 +18 54 02.636748948   11.16 10.63     F5 19 0
11 V* CK Ind gD* 22 04 38.4299738040 -64 43 42.007848070   7.57 7.32     A9/F0V-IV 78 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-08:19:18

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