J/A+A/552/A60 CoRoT 102918586 light curve and spectra (Maceroni+, 2013)
CoRoT 102918586: a gamma Dor pulsator in a short-period eccentric eclipsing
binary.
Maceroni C., Montalban J., Gandolfi D., Pavlovski K., Rainer M.
<Astron. Astrophys. 552, A60 (2013)>
=2013A&A...552A..60M 2013A&A...552A..60M
ADC_Keywords: Binaries, eclipsing ; Binaries, spectroscopic ; Photometry ;
Spectroscopy
Keywords: binaries: eclipsing - binaries: spectroscopic - stars: oscillations -
stars: individual: CoRoT 102918586 - stars: fundamental parameters
Abstract:
Pulsating stars in eclipsing binary systems are powerful tools to test
stellar models. Binarity enables us to constrain the pulsating
component physical parameters and this knowledge drastically improves
the input physics for asteroseismic studies. The study of stellar
oscillations then allows us to improve our understanding of stellar
interiors and stellar evolution. The space mission CoRoT discovered
several promising objects suitable for these studies. They were
photometrically observed with unprecedented accuracy, but needed
spectroscopic follow-up. A promising target was the relatively bright
eclipsing system CoRoT 102918586, which turned out to be a
double-lined spectroscopic binary and also showed clear evidence of
Gamma Dor type pulsations. With the aim of combining the information
from binarity and pulsation and fully exploiting the potential of
CoRoT photometry we obtained phase resolved high-resolution
spectroscopy with the Sandiford spectrograph at the McDonald 2.1m
telescope and the FEROS spectrograph at the ESO 2.2m telescope.
Spectroscopy yielded both the radial velocity curves and, after
spectra disentangling, the component effective temperatures,
metallicity, and line-of-sight projected rotational velocities. The
CoRoT light curve was analyzed with an iterative procedure, devised to
disentangle eclipses from pulsations. The eclipsing binary light curve
analysis, combined with the spectroscopic results, provided an
accurate determination of the system parameters, and the comparison
with evolutionary models provided strict constraints on the system
age. Finally, the residuals obtained after subtraction of the best
fitting eclipsing binary model were analyzed to determine the pulsator
properties. We achieved a complete and consistent description of the
system. The primary star pulsates with typical gamma Dor frequencies
and shows a splitting in period that is consistent with high order
g-mode pulsations in a star of the corresponding physical parameters.
The value of the splitting, in particular, is consistent with
pulsations in l=1 modes.
Description:
The files contain:
- the CoRoT light curve of CoRoT 102918586 pre-whitened with the
pulsation frequencies found in the Fourier spectrum with S/N>4 in
amplitude (Table 6 in the paper). The phases are computed with the
ephemeris TminI(d)=2454139.3798(4)+4.39138(6)E
- The spectra of CoRoT 102918586 obtained with the Sandiford
spectrograph at McDonald Observatory.
- The disentangled FEROS spectra of the two components of the binary.
Objects:
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RA (2000) DE Designation(s)
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06 48 54.29 -00 52 22.8 CoRoT 102918586 = CoRoT 102918586
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
prewhtlc.dat 20 8061 Pre-whitened phased lightcurve
smcdsp01.dat 22 20739 McDonald spectrum at mid-exposure time
HJD=2455173.91505
smcdsp02.dat 22 20476 McDonald spectrum at mid-exposure time
HJD=2455174.92338
smcdsp03.dat 22 20550 McDonald spectrum at mid-exposure time
HJD=2455175.79675
smcdsp04.dat 22 20374 McDonald spectrum at mid-exposure time
HJD=2455176.85916
smcdsp05.dat 22 20585 McDonald spectrum at mid-exposure time
HJD=2455177.99142
smcdsp06.dat 22 20474 McDonald spectrum at mid-exposure time
HJD=2455178.97185
smcdsp07.dat 22 20347 McDonald spectrum at mid-exposure time
HJD=2455179.82043
smcdsp08.dat 22 20434 McDonald spectrum at mid-exposure time
HJD=2455584.90412
smcdsp09.dat 22 20294 McDonald spectrum at mid-exposure time
HJD=2455585.90004
smcdsp10.dat 22 20350 McDonald spectrum at mid-exposure time
HJD=2455588.89373
dissppri.dat 21 6852 Disentangled spectrum of primary component
disspsec.dat 21 6852 Disentangled spectrum of secondary component
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See also:
B/corot : CoRoT observation log Release 12 (CoRoT, 2009-2013)
Byte-by-byte Description of file: prewhtlc.dat
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Bytes Format Units Label Explanations
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1- 8 F8.6 --- Phase [0/1] Orbital phase
13- 20 F8.6 --- NFlux Median normalized flux
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Byte-by-byte Description of file: smcdsp*.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 0.1nm lambda [5040/6100] Wavelength in Angstroms
15- 22 F8.6 --- NFlux Normalized flux (1)
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Note (1): The spectrum contains merged echelle orders. A flux value of unity
is assigned to contaminated pixels (due to an instrumental effect).
The barycentric velocity was subtracted.
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Byte-by-byte Description of file: dissppri.dat disspsec.dat
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Bytes Format Units Label Explanations
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1- 10 F10.5 0.1nm lambda [4834/5481] Wavelength in Angstroms
14- 21 F8.6 --- NFlux Normalized flux
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Acknowledgements:
Carla Maceroni, carla.maceroni(at)oa-roma,inaf.it
(End) Carla Maceroni [OAR-INAF, Italy], Patricia Vannier [CDS] 25-Mar-2013