SIMBAD references

1997A&AS..122..471K - Astron. Astrophys., Suppl. Ser., 122, 471-481 (1997/May-1)

The optical gravitational lensing experiment. Variable stars in globular clusters. II. Fields 5139D-F in ω Centauri.

KALUZNY J., KUBIAK M., SZYMANSKI M., UDALSKI A., KRZEMINSKI W., MATEO M. and STANEK K.

Abstract (from CDS):

Three fields located close to the center of the globular cluster ω Cen were surveyed in a search for variable stars. We present V-band light curves for 32 periodic variables. This sample includes 10 SX Phe stars, 19 eclipsing binaries, and three likely spotted variables (FK Com or RS CVn type stars). Only 5 of these variables were previously known (including two objects reported in Paper I). All SX Phe stars and 8 eclipsing binaries from our sample belong to blue stragglers. Five binaries occupy positions on the upper main-sequence of the cluster and another four are located at the base of the subgiant branch. Of particular interest is detection of a detached binary system with a period P=4.64 day. Further study of this star can provide direct information about properties of turnoff stars in ω Cen. All SX Phe stars and most of eclipsing binaries discovered in our survey are likely cluster members. We present V vs. V-I color-magnitude diagrams for the monitored fields. A populous group of likely hot subdwarfs as well as numerous candidates for blue stragglers can be noted in these diagrams. Our data indicate that ω Cen possesses the largest number of blue stragglers among all galactic globulars.

Abstract Copyright:

Journal keyword(s): globular clusters: individual: ω Cen - star: variables: other - blue stragglers - binaries: eclipsing - HR diagram

VizieR on-line data: <Available at CDS (J/A+AS/122/471): tables 9 to 46>

Nomenclature: OGLEGC NN (Nos 41-70)

Simbad objects: 171

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