Release 11.12 ("Hergest Ridge")
Article ID: gc405 | |
Author | Piotto, G.; et al. |
Title | C-M diagram and luminosity function of the Galactic globular cluster NGC 7099. I - Photographic photometry |
Journal | Astronomical Journal, vol. 94, p. 360-371, 536 |
Year of publication | 1987 (on gclusters from 2013-11-13 11:58:11 ) |
Abstract | New photographic photometry of about 4400 stars in the field of the Galactic globular cluster NGC 7099 = M30 is presented. A C-M diagram and a luminosity function are obtained from this photometry. The distance modulus is estimated at 14.5 + or - 0.5 assuming V(HB) = 15.11 + or - 0.10 and E(B-V) = 0.03 + or - 0.03. The metallicity is (Fe/H) = 1.9 + or - 0.3 based on the dereddened color index (B-V)0,g = 0.71 + or - 0.03. The theoretical isochrones of VandenBerg and Bell (1985) give a better fit to the observations assuming (Fe/H) = -1.8, (m-M)V = 14.6, and E(B-V) = 0.02. A fair fit is also obtained using isochrones of low iron content with an oxygen enhancement of 0.7. From the fit, an age of 17 + or - 4 Gyr is deduced. |
CM diagram | |
Tags | NGC 7099 |
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