Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...291..595a&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 291, April 15, 1985, p. 595-610.
Astronomy and Astrophysics
Astrophysics
72
Astronomical Photometry, Color-Magnitude Diagram, Globular Clusters, Interstellar Extinction, Metallicity, Open Clusters, Stellar Evolution, Video Data
Scientific paper
Video Camera photometry obtained with the Kitt Peak National Observatory 2.1 m telescope has been reduced and analyzed for the old open cluster NGC 6791 and the globular cluster NGC 6535. For the former, the CM diagram near the turnoff bears a striking similarity to that of NGC 188, with the inference that the two are similar in metallicity. A value of 0.20 + or - 0.02 is adopted for the cluster reddening, indicating an age intermediate between NGC 188 and Melotte 66. The apparent modulus of NGC 6791 is 2.2 mag larger than that of NGC 188. For NGC 6535, the CM-diagram morphology indicates a cluster very similar to M13. Based on the relative magnitudes of the horizontal branch and main-sequence turnoffs, the age is found to be about 15-18 billion years. There is no evidence of a significant population of blue stragglers near the core of the cluster.
Anthony-Twarog Barbara J.
Twarog Bruce A.
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