J/A+A/563/A59 KIC 3858884: list of pulsation frequencies (Maceroni+, 2014)
KIC 3858884: a hybrid delta 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.,
Southworth J.
<Astron. Astrophys. 563, A59 (2014)>
=2014A&A...563A..59M 2014A&A...563A..59M
ADC_Keywords: Binaries, eclipsing ; Binaries, spectroscopic ; Stars, variable
Keywords: binaries: eclipsing - binaries: spectroscopic -
stars: fundamental parameters - stars: interiors -
stars: oscillations - stars: individual: KIC 3858884
Abstract:
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 delta 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.
Description:
The file contains the frequencies detected by SigSpec (Reegen,
2007A&A...467.1353R 2007A&A...467.1353R) in the amplitude spectrum of KIC 3858884, after
subtraction from the binned normalized light curve of the contribution
of the eclipsing binary (eclipses and proximity effects). The eclipse
sections were, anyway, excluded from the analysis.
Objects:
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RA (2000) DE Designation(s)
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19 34 46.90 +38 58 58.0 KIC 3858884 = HIP 96299
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
freqs.dat 71 400 Frequencies detected in the amplitude spectrum of
KIC 3858884 (from the residuals without eclipses)
(full table2)
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/A+A/556/A52 : gamma Dor stars sample for asteroseismology (Tkachenko+, 2013)
J/A+A/556/A56 : KIC 11285625: list of detected frequencies (Debosscher+, 2013)
Byte-by-byte Description of file: freqs.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- N [1/400] Frequency sequential number
9- 15 F7.4 d-1 Freq [0.0099/29.429] Frequency value
20- 25 F6.4 d-1 e_Freq Frequency uncertainty (1)
30- 34 F5.2 mmag Amp [0.02/10.15] Amplitude
39- 42 F4.2 mmag e_Amp Amplitude uncertainty (1)
47- 51 F5.3 --- Phase Phase in eclipsing orbit
56- 60 F5.3 --- e_Phase Phase uncertainty (1)
65- 71 F7.2 --- Signi Spectral significance
(Reegen 2007A&A...467.1353R 2007A&A...467.1353R)
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Note (1): uncertainties are derived according to (Kallinger et al.,
2008A&A...481..571K 2008A&A...481..571K).
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Acknowledgements:
Carla Maceroni, maceroni(at)oa-roma.inaf.it
(End) Carla Maceroni [INAF-OAR, Italy], Patricia Vannier [CDS] 31-Jan-2014