Issue |
A&A
Volume 424, Number 3, September IV 2004
|
|
---|---|---|
Page(s) | 1101 - 1110 | |
Section | Catalogs and data | |
DOI | https://doi.org/10.1051/0004-6361:20047137 | |
Published online | 06 September 2004 |
Cluster AgeS Experiment Catalog of variable stars in the globular cluster ω Centauri *,**
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
We present results of a photometric survey for variable
stars in the field of the globular cluster ω Centauri. The
observed region was centered roughly on the cluster core and covered
644 arcmin2. 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 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
© ESO, 2004
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