J/A+A/557/A79 Spectra of KIC10661783 (Lehmann+, 2013)
Physical properties of the eclipsing delta Scuti star KIC10661783.
Lehmann H., Southworth J., Tkachenko A., Pavlovski K.
<Astron. Astrophys. 557, A79 (2013)>
=2013A&A...557A..79L 2013A&A...557A..79L
ADC_Keywords: Binaries, eclipsing ; Binaries, spectroscopic ; Spectroscopy
Keywords: asteroseismology - binaries: eclipsing -
stars: variable: delta Scuti - stars: fundamental parameters -
stars: abundances
Abstract:
KIC 10661783 is an eclipsing binary that shows delta Sct-like
oscillations. More than 60 pulsation frequencies have been detected in
its light curve as observed by the Kepler satellite.
We want to determine the fundamental stellar and system parameters of
the eclipsing binary as a precondition for asteroseismic modelling of
the pulsating component and to establish whether the star is a
semi-detached Algol-type system.
We measured the radial velocities of both components from new
high-resolution spectra using TODCOR and compute the orbit using
PHOEBE. We used the KOREL program to decompose the observed spectra
into its components, and analysed the decomposed spectra to determine
the atmospheric parameters. For this, we developed a new computer
program for the normalisation of the KOREL output spectra. Fundamental
stellar parameters are determined by combining the spectroscopic
results with those from the analysis of the Kepler light curve.
We obtain Teff, logg, vsini, and the absolute masses and radii of the
components, together with their flux ratio and separation. Whereas the
secondary star rotates synchronously with the orbital motion, the
primary star rotates subsynchronously by a factor of 0.75. The newly
determined mass ratio of 0.0911 is higher than previously thought and
means a detached configuration is required to fit the light curve.
With its low orbital period and very low mass ratio, the system shows
characteristics of the R CMa-type stars but differs from this group by
being detached. Its current state is assumed to be that of a detached
post-Algol binary system with a pulsating primary component.
Description:
In 2010, we obtained 26 high-resolution spectra of KIC 10661783 in
seven almost consecutive nights using the Coude-echelle spectrograph
at the 2-m telescope of the Thueringer Landessternwarte Tautenburg.
The spectra have a resolving power of 64000 and cover the wavelength
range 470-740nm. The exposure time was 30 min and the spectra have a
signal-to-noise ratio of 90 on average. They were reduced using
standard ESO-MIDAS packages and a routine for the calibration of the
instrumental radial velocity zero-point using O2 telluric lines.
Objects:
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RA (2000) DE Designation(s)
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19 21 11.62 +47 58 43.0 KIC 10661783 = TYC 3547-2135-1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
hjd.dat 42 26 List of individual spectra (470-736nm)
sp/* . 26 Individual spectra as FITS files
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See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/A+A/549/A104 : Spectroscopy of delta Scuti star KIC 5988140 (Lampens+, 2013)
J/A+A/556/A56 : KIC 11285625: list of detected frequencies (Debosscher+, 2013)
Byte-by-byte Description of file: hjd.dat
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Bytes Format Units Label Explanations
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1- 2 I02 --- No [1/26] Spectrum number
4- 13 A10 "Y/M/D" Obs.date Observation date
15- 22 A8 "h:m:s" Obs.time UT time of mean exposure
24- 27 I4 s Texp Exposure time
29- 42 F14.6 --- HJD Heliocentric Julian date
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Acknowledgements:
Holger Lehmann, lehm(at)tls-tautenburg.de
References:
Southworth et al., 2011MNRAS.414.2413S 2011MNRAS.414.2413S, Kepler photometry of KIC 10661783
(End) Holger Lehmann [TLS, Germany], Patricia Vannier [CDS] 13-Aug-2013