Old open clusters: the interesting case of Berkeley 21

Details Old open clusters: the interesting case of Berkeley 21 Old open clusters: the interesting case of Berkeley 21

1998-04-07

arxiv.org/abs/astro-ph/9804071v1

Astronomy and Astrophysics

Astrophysics

13 pages, latex, uses mn.sty, 7 encapsulated figures, to be published in MNRAS, text and figures also available at http://ww

Scientific paper

10.1046/j.1365-8711.1998.01812.x

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.

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