Astron. Astrophys. Suppl. Ser.
Volume 133, Number 1, November II 1998
|Page(s)||25 - 28|
|Published online||15 November 1998|
CCD photometry of distant open clusters*,**
IV. Trumpler 5
Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland
Send offprint request to: J. Kaluzny
Accepted: 13 May 1998
We present BVI photometry for Trumpler 5, a rich open cluster located in the Galactic anticenter. The cluster age is slightly lower than the age of M 67. Its distance modulus and reddening are estimated at 12.4 and 0.58, respectively. These values were obtained for the assumed solar metallicity of the cluster. Our data indicate that Tr 5 is one of the richest objects among the sample of known old open clusters. The total mass included only in upper-main sequence stars exceeds 3000 . The angular diameter of the cluster is estimated at 11.6 arcmin, which corresponds to a linear size of about 20 pc for an estimated distance kpc.
Key words: open clusters and associations: individual: Trumpler 5 / HR diagram
Visiting Astronomer, Kitt Peak National Observatory. KPNO is operated by AURA, Inc., under contract with the National Science Foundation.
© European Southern Observatory (ESO), 1998