CCD search for faint variables in the field of an Omega Centauri low-luminosity X-ray source, and in 47 Tucanae

Journal Article · Sun May 01 04:00:00 EDT 1988 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/166317· OSTI ID:7024032

Shara, M M; Kaluzny, J; Potter, M; Moffat, A F.J.

The results of a CCD search for faint and/or small amplitude variables in the field of a low luminosity X-ray source in Omega Cen, and in a rich field in 47 Tuc is reported. None of the about 3750 stars identified by DAOPHOT in the two frames varied by as much as sigma = 0.03-0.08 mag during 3-4 hr of frequently repeated imaging. If the Omega Cen X-ray source is variable, it was fainter than about + 7.5 during the observations. Contact binaries (W UMa stars) are at least as rare in the outskirts of these globulars as they are in the solar vicinity. 17 references.

• Research Organization: Space Telescope Science Institute, Baltimore, MD (USA); Montreal Univ., Montreal (Canada)
• OSTI ID: 7024032
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 328; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BINARY STARS
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
LUMINOSITY
NEUTRON STARS
OPTICAL PROPERTIES
PHOTOMETRY
PHYSICAL PROPERTIES
STAR CLUSTERS
STAR EVOLUTION
STARS
VARIABLE STARS