Bibcode
Almenara, J. M.; Alonso, R.; Rabus, M.; Lázaro, C.; Arévalo, M. J.; Belmonte, J. A.; Deeg, H. J.; Brown, T. M.; Vázquez-Ramió, H.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 420, Issue 4, pp. 3017-3025.
Advertised on:
3
2012
Citations
9
Refereed citations
9
Description
We present a new eclipsing post-common-envelope binary, identified
inside the Kepler field prior to the launch of the spacecraft.
Multifilter photometry and radial velocity data are analysed with an
eclipsing-binary modelling code to determine the physical parameters of
the binary. Spectra of the system within the primary eclipse and
uneclipsed allow us to identify the spectral characteristics of the
primary and secondary components. The primary component of the binary is
a DA white dwarf, with M≃ 0.61 M&sun;, log g≃ 7.95
and Teff≃ 20 500 K.
The detection of two flares and the emission signatures displayed in the
spectra show that the secondary component of the system is
chromospherically active and is classified as an active M4 main-sequence
star. Its mass, radius and temperature are estimated as M≃ 0.39
M&sun;, R≃ 0.37 R&sun; and
Teff≃ 3200 K. The ephemeris of the system is HJD = 245
3590.436 126(10) + 0.350 468 722(6) ×E.
This binary is a new post-common-envelope binary (PCEB), with physical
parameters within the range found in other systems of this small group
of evolved binaries.
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