J/A+A/553/A127 Frequency tables of KIC4931738 and KIC6352430 (Papics+, 2013)
Two new SB2 binaries with main sequence B-type pulsators in the Kepler field.
Papics P.I., Tkachenko A., Aerts C., Briquet M., Marcos-Arenal P.,
Beck P.G., Uytterhoeven K., Trivino Hage A., Southworth J., Clubb K.I.,
Bloemen S., Degroote P., Jackiewicz J., McKeever J., Van Winckel H.,
Niemczura E., Gameiro J.F., Debosscher J.
<Astron. Astrophys. 553, A127 (2013)>
=2013A&A...553A.127P 2013A&A...553A.127P
ADC_Keywords: Stars, variable ; Stars, B-type
Keywords: asteroseismology - stars: fundamental parameters - stars: abundances -
stars: oscillations - stars: early-type - binaries: general
Abstract:
OB stars are important in the chemistry and evolution of the Universe,
but the sample of targets that is well understood from an
asteroseismological point of view is still too limited to provide
feedback on the current evolutionary models.
We extend this sample with two spectroscopic binary systems. Our goal
is to provide orbital solutions, fundamental parameters, and
abundances from disentangled high-resolution high signal-to-noise
spectra, as well as to analyse and interpret the variations in the
Kepler light curve of these carefully selected targets. This way we
continue our efforts to map the instability strips of beta Cep and
slowly pulsating B stars using the combination of high-resolution
ground-based spectroscopy and uninterrupted space-based photometry.
We fit Keplerian orbits to radial velocities measured from selected
absorption lines of high-resolution spectroscopy using synthetic
composite spectra to obtain orbital solutions. We used revised masks
to obtain optimal light curves from the original pixel-data from the
Kepler satellite, which provided better long-term stability compared
to the pipeline-processed light curves. We used various time-series
analysis tools to explore and describe the nature of variations
present in the light curve.
We find two eccentric double-lined spectroscopic binary systems
containing a total of three main sequence B-type stars (and one F-type
component), of which at least one in each system exhibits light
variations. The light curve analysis (combined with spectroscopy) of
the system of two B stars points towards the presence of tidally
excited g modes in the primary component. We interpret the variations
seen in the second system as classical g mode pulsations driven by the
kappa mechanism in the B type primary, and explain the unexpected
power in the p mode region as the result of nonlinear resonant mode
excitation.
Description:
Fourier parameters (frequencies (fj), amplitudes (Aj), and phases
(thetaj)) of the selected peaks having a signal-to-noise ratio (S/N)
above 4 for KIC 4931738 and KIC 6352430 when computed in a 1d-1
window after prewhitening. The displayed S/N values are calculated in
a window of 1d-1 or 3d-1 centred on the given frequency, or from
the full periodogram (from 0d-1 to 24.47d-1). A complete list of
all significant frequencies is available upon request.
Objects:
--------------------------------------------------------------
RA (2000) DE Designation(s)
--------------------------------------------------------------
19 36 00.89 +40 05 55.2 KIC 4931738 = TYC 3139-291-1
19 10 57.76 +41 46 33.4 KIC 6352430 = HD 179506
--------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 89 262 Fourier parameters for KIC 4931738
tablea2.dat 89 555 Fourier parameters for KIC 6352430
--------------------------------------------------------------------------------
See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/A+A/393/965 : Slowly pulsating B stars intrinsic frequencies (de Cat+, 2003)
J/A+A/506/111 : Frequency analysis of HD 180642 (V1449 Aql) (Degroote+, 2009)
J/A+A/506/471 : Frequency analysis of CoRoT B stars (Degroote+, 2009)
J/A+A/525/A23 : Frequency analysis of HD 49434 (Mathias+, 2011)
J/A+A/544/A106 : p-mode frequencies of the solar twin 18 Sco (Bazot+, 2012)
J/A+A/549/A104 : The Kepler delta Scuti star KIC 5988140 (Lampens+, 2013)
Byte-by-byte Description of file: tablea1.dat tablea2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.6 d-1 f [0.004/22] Frequency
14- 23 F10.6 d-1 e_f Frequency error
27- 33 F7.1 ppm A Amplitude (in 10-6)
37- 43 F7.1 ppm e_A Amplitude error
48- 54 F7.4 --- theta [-0.5/0.5] Phase θ=φ(rad)/π
59- 65 F7.4 --- e_theta Phase error
69- 73 F5.1 --- S/N1 Signal-to-noise in a 1d-1 wide window around f
77- 81 F5.1 --- S/N3 Signal-to-noise in a 3d-1 wide window around f
85- 89 F5.1 --- S/Nf Signal-to-noise computed over full periodogram
--------------------------------------------------------------------------------
Acknowledgements:
Peter I. Papics, Instituut voor Sterrenkunde, Peter.Papics(at)ster.kuleuven.be
(End) P. Papics [Inst. Sterrenkunde, KU Leuven], P. Vannier [CDS] 10-Apr-2013