EDP Sciences
Free access
Volume 503, Number 2, August IV 2009
Page(s) 651 - 662
Section Catalogs and data
DOI http://dx.doi.org/10.1051/0004-6361/200912142
Published online 02 July 2009
A&A 503, 651-662 (2009)
DOI: 10.1051/0004-6361/200912142

Deep census of variable stars in a VLT/VIMOS field in Carina

P. Pietrukowicz1, 2, D. Minniti1, 3, J. M. Fernández1, 4, G. Pietrzyński5, 6, M. T. Ruíz7, W. Gieren5, R. F. Díaz8, M. Zoccali1, and M. Hempel1

1  Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña MacKenna 4860, Casilla 306, Santiago 22, Chile
    e-mail: pietruk@astro.puc.cl
2  Nicolaus Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warszawa, Poland
3  Vatican Observatory, Vatican City State 00120, Italy
4  Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
5  Departamento de Astronomía, Universidad de Concepción, Casilla 160 C, Concepción, Chile
6  Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
7  Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
8  Instituto de Astronomía y Física del Espacio (CONICET-UBA), Buenos Aires, Argentina

Received 24 March 2009 / Accepted 26 May 2009

Aims. We searched for variable stars in deep V-band images of a field towards the Galactic plane in Carina.
Methods. The images were taken with the VIMOS instrument at ESO VLT during 4 contiguous nights in April 2005. We detected 348 variables among 50 897 stars in the magnitude range between V = 15.4 and V = 24.5 mag. After detection, we classified the variables by a direct eye inspection of their light curves.
Results. All variable objects besides 9 OGLE transits in the field are new discoveries. We provide a complete catalog of all variables, which includes eclipsing/ellipsoidal binaries, miscellaneous pulsators (mostly $\delta$ Scuti-type variables), stars with flares, and other (irregular and likely long-period) variables. Only two of the stars in our sample are known to host planets.
Conclusions. Our result has implications for future large variability surveys.

Key words: stars: variables: general -- stars: variables: delta Sct -- binaries: eclipsing -- stars: flare -- planetary systems -- stars: statistics

© ESO 2009