29th General Assembly of the International Astronomical Union
I present the results of a study of the radial variations of the ratio of the two populations of stars in the galactic globu-lar cluster NGC2419 as seen in eight broad-band, HST/WFC3 colors. The populations are identified as a metal-poor first generation (FG) with an age of 12 Gyr and a relatively metal-rich, oxygen and helium-rich, second generation (SG), with an age of 10 Gyr. Synthetic color-magnitude diagrams of NGC2419 are used to determine the fractions of the present-day stellar population that are FG and SG stars. The distance modulus of this cluster and the color excess, E(B-V), are estimated from consistent fits of stellar evolutionary models to eight color-magnitude diagrams. It is shown that the signature of two stellar generations can be clearly seen in the popu-lation ratio profiles. This is the first time Hubble Legacy Archive source catalogs
Astrophysics and Astronomy | Physics
Stephen D. Gillam (2015).
The Spatial Distribution of the Red Giants in the Distant Galactic Globular Cluster Cluster NGC2419. Presented at 29th General Assembly of the International Astronomical Union, Honolulu, Hawaii.