| Full text | |
| Author(s): |
Ortolani, S.
;
Bica, E.
;
Barbuy, B.
[3]
;
Zoccali, M.
Total Authors: 4
|
| Document type: | Journal article |
| Source: | Astronomy & Astrophysics; v. 429, n. 2, p. 607-612, 2005. |
| Field of knowledge: | Physical Sciences and Mathematics - Astronomy |
| Abstract | |
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. (AU) | |
| FAPESP's process: | 00/10406-4 - Chemical evolution and stellar populations of the galaxy, magellanic clouds and elliptical galaxies, based on spectroscopy and imaging |
| Grantee: | Beatriz Leonor Silveira Barbuy |
| Support Opportunities: | Research Projects - Thematic Grants |