Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-11-30
Mon.Not.Roy.Astron.Soc.366:1493-1502,2006
Astronomy and Astrophysics
Astrophysics
Accepted for publication on MNRAS; fig. 3, 4, 5, 6 at degraded resolution
Scientific paper
10.1111/j.1365-2966.2005.09929.x
We present CCD UBVI photometry and high-resolution spectroscopy of the intermediate age open cluster NGC 3960. The colour - magnitude diagrams (CMDs) derived from the photometric data and interpreted with the synthetic CMD method allow us to estimate the cluster parameters. We derive: age = 0.9 or 0.6 Gyr (depending on whether or not overshooting from convective regions is included in the adopted stellar models), distance (m-M)0 = 11.6 +/- 0.1, reddening E(B-V) = 0.29 +/- 0.02, differential reddening Delta E(B-V) = 0.05 and approximate metallicity between solar and half of solar. We obtained high resolution spectra of three clump stars, and derived an average [Fe/H] = -0.12 (rms 0.04 dex), in very good agreement with the photometric determination. We also obtained abundances of alpha-elements, Fe-peak elements, and of Ba. The reddenings toward individual stars derived from the spectroscopic temperatures and the Alonso et al. calibrations give further support to the existence of significative variations across the cluster.
Bragaglia Angela
Carretta Eugenio
Gratton Raffaele G.
Marconi Gianni
Pompei Emanuela
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