Release 11.12 ("Hergest Ridge")


Gclusters :: Bibliographic item "gc405"

Article ID: gc405
AuthorPiotto, G.; et al.
TitleC-M diagram and luminosity function of the Galactic globular cluster NGC 7099. I - Photographic photometry
JournalAstronomical Journal, vol. 94, p. 360-371, 536
Year of publication1987 (on gclusters from 2013-11-13 11:58:11 )
AbstractNew 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
TagsNGC 7099

This page has been visited 436 times since March, 14 2013

Query processed at 21:14, 20th October


Top of the page

Home | Parameters | Table 1 | Table 2 | Table 3
Search | Feedback | What's new | Links | Blog