CCD photometry of distant open clusters. III. Berkeley 18

Details CCD photometry of distant open clusters. III. Berkeley 18 CCD photometry of distant open clusters. III. Berkeley 18

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..121..455k&link_type=abstract

A & A Supplement series, Vol. 121, March 1997, 455-460.

Astronomy and Astrophysics

Astronomy

5

Open Clusters And Associations: Individual: Berkeley 18, Hr Diagram

Scientific paper

We present CCD BVI photometry for Berkeley 18, a rich open cluster located in the Galactic anticenter. The cluster age is similar to, or mariginally lower than age of M 67. Its distance is estimated at 5.8 kpc and the reddening E(B-V) is probably higher than 0.46. Our data indicate that Be 18 is one of the most populous objects in the whole sample of known galactic open clusters. The angular diameter of the cluster is estimated at 26 arcmin, which corresponds to a linear size of about 44 pc. The horizontal branch of Be 18 exhibits a large width in comparison with other old open clusters. Tables 3-5 are available in electronic form at the CDS, via ftp 130.79.128.5.

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