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VSX J071108.7+695227: a Newly Discovered Short-period Eclipsing Binary

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Mario Damasso
Astronomical Observatory of the Autonomous Region of the Aosta Valley, fraz. Lignan 39, 11020 Nus (Aosta), Italy; INAF associated
and
Dept. of Physics and Astronomy, University of Padova, vicolo dell’Osservatorio 3, I-35122 Padova, Italy

Davide Cenadelli
Paolo Calcidese

Astronomical Observatory of the Autonomous Region of the Aosta Valley, fraz. Lignan 39, 11020 Nus (Aosta), Italy; INAF associated

Luca Borsato
Dept. of Physics and Astronomy, University of Padova, vicolo dell’Osservatorio 3, I-35122 Padova, Italy; INAF-OAPd associated

Valentina Granata
Dept. of Physics and Astronomy, University of Padova, vicolo dell’Osservatorio 3, I-35122 Padova, Italy

Valerio Nascimbeni
Dept. of Physics and Astronomy, University of Padova, vicolo dell’Osservatorio 3, I-35122 Padova, Italy; INAF-OAPd associated

Received March 28, 2012; revised April 13, 2012; accepted April 16, 2012

Abstract

We report the discovery of an EW variable, VSX J071108.7+695227, with a short orbital period of ~0.238 day. This period is very close to the lower limit of ~0.22 day that has been found for EW systems. Here we present and discuss photometric and spectroscopic data of the variable, collected at the Astronomical Observatory of the Autonomous Region of the Aosta Valley and at the Asiago Astrophysical Observatory. The light curves show some asymmetries and the spectra suggest a dK4 classification for the two components. It could be interesting to carry out further observations of this system at different epochs because such systems frequently show variations in period and in the features of the light curve.

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