The Globular Cluster NGC 6981: Variable stars population, physical parameters and astrometry

Details The Globular Cluster NGC 6981: Variable stars population, physical parameters and astrometry The Globular Cluster NGC 6981: Variable stars population, physical parameters and astrometry

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011rmxac..40..235f&link_type=abstract

XIII Latin American Regional IAU Meeting (Eds. W. J. Henney & S. Torres-Peimbert) Revista Mexicana de Astronomía y Astrofísica (

Astronomy and Astrophysics

Astronomy

Blue Stragglers, Globular Clusters: Individual (Ngc 6981), Stars: Evolution, Stars: Variables: Rr Lyrae

Scientific paper

We present the results of time-series CCD photometry of the globular cluster NGC 6981 for which no previous CCD photometry exist. Accurate photometry was achieved by the technique of difference image analysis. This allows to correctly classify the known variable stars, corroborate their variability and to discover new variables. In this paper we report 11 new RR Lyrae stars, 3 SX Phe. We show that 20 stars previously classified as variables are in fact non-variable and confirm the variability of 29 stars. News ephemerides are provided for all the variables in the cluster. By using the Fourier decomposition of light curves and semi-empirical calibrations available in the literature for RR Lyrae stars, we determined the physical parameters of these stars and hence the mean metallicity and distance of the cluster as [Fe/H]=-1.48±0.03 in the Zinn & West (1984) scale; and ≈ 16.73±0.36 kpc.

Affiliated with

Also associated with

No associations

Rating

The Globular Cluster NGC 6981: Variable stars population, physical parameters and astrometry does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Globular Cluster NGC 6981: Variable stars population, physical parameters and astrometry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Globular Cluster NGC 6981: Variable stars population, physical parameters and astrometry will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1674325