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A&A Supplement series, Vol 121, March 1997, 451-454

Received April 16; accepted June 11, 1996

VI photometry of the galactic cluster Berkeley 66gif'

M.D. Guarnieritex2html_wrap860, and G. Carrarotex2html_wrap862

Send offprint request: G. Carraro

tex2html_wrap864  Department of Mathematical Physics, Torino University, Torino, Italy
tex2html_wrap866  Torino Astronomical Observatory, Strada Osservatorio 20, I-10025 Pino Torinese, Torino, Italy
tex2html_wrap868  Department of Astronomy, Padova University, vicolo dell'Osservatorio 5, I-35122 Padova, Italy


A colour magnitude diagram (CMD) extending to tex2html_wrap_inline840 mag is given for 444 stars in the region of the galactic cluster Berkeley 66. The V and I photometry of a nearby field is also reported. This object appears very faint, highly contaminated by foreground stars and very reddened. The apparent distance modulus (m-M) and the colour excess tex2html_wrap_inline848 are guessed to be 17.5 and 1.1, respectively, with an uncertainty of at least 30%. Adopting these values the comparison of the CMD with theoretical isochrones from the Padova group provides an age around 1.0 Gyr.

keywords: open clusters: Berkeley 66 -- HR diagram

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