Open AccessThe intermediate age open cluster NGC 2660 ★
Author(s) -
Sandrelli S.,
Bragaglia A.,
Tosi M.,
Marconi G.
Publication year - 1999
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.1999.02906.x
Subject(s) - physics , distance modulus , open cluster , metallicity , photometry (optics) , astrophysics , stars , population , cluster (spacecraft) , astronomy , medicine , computer science , programming language , environmental health
We present CCD UBVI photometry of the intermediate old open cluster NGC 2660, covering from the red giant region to about seven magnitudes below the main sequence turn‐off. Using the synthetic colour–magnitude diagram method, we estimate in a self‐consistent way values for distance modulus [( m − M ) 0 ≃12.2], reddening [ E ( B − V )≃0.40], metallicity ([Fe/H] about solar) and age ( τ ≲1 Gyr). A 30 per cent population of binary stars turns out to be probably present.