A CCD BVRI color-magnitude study of the globular cluster NGC 5286.

Details A CCD BVRI color-magnitude study of the globular cluster NGC 5286. A CCD BVRI color-magnitude study of the globular cluster NGC 5286.

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26as..112..439s&link_type=abstract

Astronomy and Astrophysics Supplement, v.112, p.439

Astronomy and Astrophysics

Astrophysics

25

Globular Clusters: Individual: Ngc 5286, Hr Diagram

Scientific paper

We present results of photoelectrically calibrated CCD BVRI photometry of 1391 stars in the globular cluster NGC 5286. The resulting color-magnitude diagrams are the first CCD CMDs ever presented for this cluster, as well as the first CMDs for this cluster reaching beyond the main sequence turn-off. The subgiant, horizontal branch, and upper main sequence parts of the color-magnitude diagram are well represented. The level of the horizontal branch (near the RR Lyrae gap) is V=16.65mag , the main sequence turn-off is observed at V=20.05mag , (B-V)=0.73mag , (V-R)=0.38mag , (V-I)=0.88mag . The 3.4Vmag difference between the turn-off and the horizontal branch is typical of many globular clusters. Comparison with isochrones evidences for moderately high values of metallicity and age of the cluster, in qualitative agreement with the age interpretation of the "second parameter".

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