BVI CCD photometry of the broad main-sequence globular cluster NGC 1851

Details BVI CCD photometry of the broad main-sequence globular cluster NGC 1851 BVI CCD photometry of the broad main-sequence globular cluster NGC 1851

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99..817a&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 99, March 1990, p. 817-837, 1046-1050.

Astronomy and Astrophysics

Astronomy

12

Astronomical Photometry, Charge Coupled Devices, Globular Clusters, Main Sequence Stars, Color-Magnitude Diagram, Giant Stars, Interstellar Extinction, Metallicity, Ubv Spectra

Scientific paper

Three-color CCD C-M diagrams are presented for the globular cluster NGC 1851, showing an extreme breadth of the main-sequence, similar to that of Omega Centauri. It is found that the main-sequence turnoff points are located at V(TO) = 19.44 + or - 0.10, with colors at B-V = 0.54 + or - 0.02, V-I = 0.61 + or - 0.02, and B-I = 1.15 + or - 0.03. The best fit to the VandenBerg and Bell (1985) isochrones is shown to be all C-M diagrams with Y = 0.20, Fe/H abundance ratio = -1.27, and (m-M)v = 15.45. It is concluded that NGC 1851 has a Delta V(TO - HB) = 3.34 + or - 0.10 and an age of 16 + or - 2 Gyr.

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