Astron. Astrophys. Suppl. Ser.
Volume 125, Number 2, October II 1997
|Page(s)||343 - 353|
|Published online||15 October 1997|
The optical gravitational lensing experiment. Variable stars in globular clusters*,**
III. RR Lyrae stars and Pop. II Cepheids in ω Centauri
Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland
2 Carnegie Observatories, Las Campanas Observatory, Casilla 601, La Serena, Chile
3 Department of Astronomy, University of Michigan, 821 Dennison Bldg., Ann Arbor, MI 48109-1090, U.S.A.
Send offprint request to: J. Kaluzny
Accepted: 6 January 1997
We present V-band photometry for 141 variable stars from the field of ω Cen. All but one variables are either RR Lyr stars or Pop. II Cepheids. One object is a distant background RR Lyr star from the galactic halo. The presented sample includes 33 newly identified variables, mostly low amplitude RR Lyr stars. We identified also two Pop. II Cepheids with exceptionally low amplitudes of light variations . The presented data may be used to study period changes of ω Cen variables and/or for Fourier decomposition of light curves.
Key words: globular clusters: individual: NGC 5139 / stars: variables: RR Lyr / stars: variables: other
Tables 3-200 are available in electronic form only at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (184.108.40.206) or via http://cdsweb.u-strasbg.fr/Abstract.html
Based on observations collected at the Las Campanas Observatory of the Carnegie Institution of Washington.
© European Southern Observatory (ESO), 1997