EDP Sciences
Free access
Volume 434, Number 3, May II 2005
Page(s) 1063 - 1068
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20034559

A&A 434, 1063-1068 (2005)
DOI: 10.1051/0004-6361:20034559

Detection of a classical $\delta$ Scuti star in the new eclipsing binary system HIP 7666

E. Escolà-Sirisi1, J. Juan-Samsó1, J. Vidal-Sáinz1, P. Lampens2, E. García-Melendo3, J. M. Gómez-Forrellad1, 3 and P. Wils4

1  Grup d'Estudis Astronòmics, Apdo. 9481, 08080 Barcelona, Spain
    e-mail: duranobs@astrogea.org
2  Koninklijke Sterrenwacht van België, Ringlaan 3, 1180 Brussel, Belgium
    e-mail: patricia.lampens@oma.be
3  Esteve Duran Observatory Foundation, Montseny 46 - Urb. El Montanya, 08553 Seva, Spain
    e-mail: duranobs@astrogea.org
4  Vereniging Voor Sterrenkunde, Belgium
    e-mail: patrick.wils@cronos.be

(Received 22 October 2003 / Accepted 15 December 2004 )

HIP 7666 is a variable star newly discovered during the Hipparcos mission and classified as of unknown type (ESA 1997, The Hipparcos and Tycho Catalogues, ESA SP-1200). During 23 nights between July 2000 and November 2000, over 2300 CCD observations in the V band were obtained. These data show that the new variable is a detached eclipsing binary system with an orbital period of 2.37229 days. In addition, one of the components undergoes very short-period oscillations with a main pulsation frequency of 24.46 or 25.47 c/d. HIP 7666 is therefore a new member of the rare group of detached eclipsing binary systems with a $\delta$ Scuti type component.

Key words: stars: binaries: eclipsing -- stars: oscillations -- stars: variables: $\delta$ Sct -- stars: individual: HIP 7666

SIMBAD Objects

© ESO 2005