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Astron. Astrophys. 346, 87-90 (1999)

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BD+61o2213: an interesting ellipsoidal or eclipsing variable in the open cluster NGC 7160

Petr Harmanec 1, Hrvoje Boi 2, Philippe Eenens 3 and Jozef iznovský 4

1 Astronomical Institute, Academy of Sciences of the Czech Republic, CZ-251 65 Ondejov, Bohemia, Czech Republic (hec@sunstel.asu.cas.cz)
2 Hvar Observatory, Faculty of Geodesy, Zagreb University, Ka ieva 26, HR-10000 Zagreb, Croatia (hbozic@geodet.geof.hr)
3 Departamento de Astronomia, Universidad de Guanajuato, Apartado 144, 36000 Guanajuato, GTO, Mexico (eenens@carina.astro.ugto.mx)
4 Astronomical Institute, Slovak Academy of Sciences, SK-059 60 Tatranská Lomnica, Slovakia (ziga@auriga.ta3.sk)

Received 10 February 1999 / Accepted 26 February 1999

Abstract

Light variability of BD+61o2213 , first suspected more than 20 years ago, is confirmed on the basis of observations from three observatories. The light of BD+61o2213 apparently varies with a period of 1[FORMULA]2028251 and a double-wave light curve. Five available radial velocities of the star also define a large-amplitude curve with the same period. The star is, therefore, a binary as suspected earlier. We conclude, however, that it is more probably an ellipsoidal variable than an eclipsing binary. Its further spectral and photometric monitoring is desirable, especially since an accurate detemination of its physical elements could also improve the knowledge of the distance of the NGC 7160 cluster.

Key words: stars: binaries: close – stars: binaries: eclipsing – stars: binaries: spectroscopic – stars: individual: BD+61O 2213 – Galaxy: open clusters and associations: individual: NGC 7160

Send offprint requests to: P. Harmanec

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© European Southern Observatory (ESO) 1999

Online publication: May 6, 1999
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