The old open clusters Berkeley 36, Berkeley 73 and Biurakan 13 (Berkeley 34)

Astronomy and Astrophysics – Astrophysics

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Galaxy: Open Clusters And Associations: Individual: Berkeley 36, Berkeley 73, Biurakan 13, Stars: Hertzsprung-Russell (Hr) And C-M

Scientific paper

BV photometry of the faint open clusters Berkeley 36, Berkeley 73 and Biurakan 13 are studied. For these clusters no colour-magnitude analyses were previously available. The colour-magnitude Diagrams indicate that they are all old open clusters. The derived ages are ˜4 Gyr for Berkeley 36, and ˜2.3 Gyr for both Berkeley 73 and Biurakan 13. The clusters are not very reddened, with E(B-V) = 0.25, 0.10 and 0.30 respectively for Berkeley 36, Berkeley 73 and Biurakan 13. Berkeley 36 and Berkeley 73 are located at a distance from the Galactic center of ˜10 kpc, while Biurakan 13 is much farther, at 15 kpc. A peak in the age distribution appears at 5 Gyr suggesting a distinct star forming event in the disk.
Observations collected at the Galileo National Telescope, La Palma, Spain.
Table 2 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/429/607

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