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Issue A&A
Volume 424, Number 3, September IV 2004
Page(s) 1101 - 1110
DOI http://dx.doi.org/10.1051/0004-6361:20047137



A&A 424, 1101-1110 (2004)
DOI: 10.1051/0004-6361:20047137

Cluster AgeS Experiment Catalog of variable stars in the globular cluster $\omega$ Centauri

J. Kaluzny1, A. Olech1, I. B. Thompson2, W. Pych1, W. Krzeminski1, 3 and A. Schwarzenberg-Czerny1

1  Nicolaus Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warszawa, Poland
    e-mail: [jka;olech;pych;alex]@camk.edu.pl
2  Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA
    e-mail: ian@ociw.edu
3  Las Campanas Observatory, Casilla 601, La Serena, Chile
    e-mail: wojtek@lco.cl

(Received 26 January 2004 / Accepted 25 May 2004)

Abstract
We present results of a photometric survey for variable stars in the field of the globular cluster $\omega$ Centauri. The observed region was centered roughly on the cluster core and covered 644 arcmin 2. The cluster was monitored on 59 nights in 1999 and 2000. A total of 117 new variables were identified. Among them there are 17 RR Lyr-type stars, 35 SX Phe variables and 26 eclipsing binaries. A comprehensive catalog including all variable stars so far reported from the cluster field is presented. We list basic photometric properties and provide finding charts for a total of 392 objects. For 313 of them new $\it BV$ light curves were obtained. The presented sample includes several interesting variables, such as SX Phe stars with extremely short periods of pulsation and several candidates for pulsating K giants. Optical counterparts to 9 X-ray sources detected by XMM and Chandra telescopes were identified: all of them are likely to be foreground variables not related to the cluster.


Key words: catalogs -- stars: variables: general -- stars: variables: RR Lyr -- stars: variables: Cepheids -- stars: blue stragglers

SIMBAD Objects
Tables at the CDS



© ESO 2004


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