Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89.1166s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 89, Aug. 1984, p. 1166-1179.
Astronomy and Astrophysics
Astronomy
25
Astronomical Photometry, Globular Clusters, Main Sequence Stars, Metallicity, Stellar Evolution, Accuracy, Gravitational Effects, Interstellar Extinction
Scientific paper
Main-sequence photometry is presented for the metal-rich globular cluster NGC 6171, based on five Palomar Hale reflector plates in each of two colors. The photometry extends to V = 21, B = 21.5. The main-sequence termination point has been found at V = 19.35, which is ΔV = 3.60±0.2 mag fainter than the zero-age horizontal branch. The reddening has been determined by analysis of the two-color diagram for field stars and for cluster stars separately with the result that E(B-V) = 0.32. The effect of low surface gravity on the emergent flux and hence on the colors of horizontal-branch stars is seen in the two-color diagram. The size of the effect relative to main-sequence stars is in agreement with theory. The age determined by three methods is 17×109yr, with an error of at least 20%.
Roques P.
Sandage Alan
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