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Oxford University Press, Monthly Notices of the Royal Astronomical Society, 3(299), p. 834-844, 1998

DOI: 10.1046/j.1365-8711.1998.01812.x

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Old open clusters: the interesting case of Berkeley 21

Journal article published in 1998 by M. Tosi, L. Pulone ORCID, G. Marconi, A. Bragaglia
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We present CCD BVI photometry of the old open cluster Berkeley 21, one of the most distant clusters in the Galactic anticentre direction, and possibly the lowest metallicity object in the open clusters sample. Its position and metal abundance make it very important for the study of the Galactic disc. Using the synthetic Colour - Magnitude Diagram method, we estimate values for distance modulus (m-M)0=13.4-13.6, reddening E(B-V)=0.74-0.78 (with possible differential absorption), and age=2.2-2.5 Gyr. Comment: 13 pages, latex, uses mn.sty, 7 encapsulated figures, to be published in MNRAS, text and figures also available at http://www.bo.astro.it/bap/BAPhome.html or via anonymous ftp at ftp://boas3.bo.astro.it/bap/files (bap98-10-textfig.ps)