CCD PHOTOMETRY OF THE GLOBULAR-CLUSTER PALOMAR-13

Authors
BORISSOVA J MARKOV H SPASSOVA N
Citation
J. Borissova et al., CCD PHOTOMETRY OF THE GLOBULAR-CLUSTER PALOMAR-13, Astronomy & Astrophysics. Supplement series, 121(3), 1997, pp. 499-505
Citations number
30
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Astronomy & Astrophysics. Supplement series → ACNP
ISSN journal
03650138
Volume
121
Issue
3
Year of publication
1997
Pages
499 - 505
Database
ISI
SICI code
0365-0138(1997)121:3<499:CPOTGP>2.0.ZU;2-W
Abstract
A new CCD photometry of the halo cluster Palomar 13 is used to constru ct a color - magnitude diagram in the Thuan-Gunn and the B, V photomet ric systems(1). The color-magnitude diagram of the cluster shows as al ready noted by Ortolani et al. (1985) an extremely poor red horizontal branch and a very sparsely populated giant branch. Seven BSS candidat es are identified in the field of Palomar 13. The age of the cluster d etermined by fitting with the isochrones of Proffitt & Vanden Berg (19 91) and Bergbusch & Vanden Berg (1992) and by a differential compariso n of the color-magnitude diagram with that of Pal 5 is 12 +/- 2 Gyr.