CCD photometry in globular clusters. I - NGC 7492

Details CCD photometry in globular clusters. I - NGC 7492 CCD photometry in globular clusters. I - NGC 7492

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26as...67..327b&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 67, no. 2, Jan. 1987, p. 327-340.

Astronomy and Astrophysics

Astrophysics

24

Astronomical Catalogs, Charge Coupled Devices, Globular Clusters, Stellar Evolution, Stellar Spectrophotometry, Hertzsprung-Russell Diagram, Main Sequence Stars, Metallicity, Star Distribution, Ubv Spectra

Scientific paper

CCD photometry in B, V colors of the globular cluster NGC 7492 is presented for complete samples down to the main sequence. The color magnitude diagram (CMD) allows a detailed discussion of the cluster properties. The main conclusions are: (1) CMD metal abundance indicators lead to [Fe/H] = -1.51±0.2. (2) A primordial helium abundance of Y = 0.23±0.07 is derived. (3) Different methods used to determine the age of the cluster converge to a value of 15.6±2.0 Gyr adopting [O/Fe] = 0.0, E(B-V) = 0.01, (m-M)v = 17.15±0.15. (4) The horizontal branch is blue and without any blue tail.

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