Color-magnitude diagrams for three distant globular clusters

Color-Magnitude Diagrams of Merged Globular Clusters: Metallicity Effects

Mergers of globular clusters (GCs) once associated with dwarf spheroidal (dSph) galaxies have recently been suggested as an explanation for the bimodal horizontal branches (HBs) of some Galactic GCs, most notably NGC 1851, NGC 2808, and NGC 6229. Through analysis of the available color-magnitude diagrams for the GCs in the Fornax and Sagittarius dSph satellites of the Milky Way, as well as thei...

Synthetic Color - Magnitude Diagrams for ω Centauri and Other Massive Globular Clusters with Multiple Populations

We have constructed synthetic color-magnitude diagrams (CMDs) for ω Cen and other massive globular clusters with apparently peculiar CMD morphology. Our population models, which adopt the most up-to-date input physics and parameters, show that the observed CMD of ω Cen can be reproduced by adopting (1) multimodal metallicity distribution function as derived from the observed color distribution ...

HST / WFPC 2 Color - magnitude Diagrams for Globular Clusters in M

We report new photometry for 10 globular clusters in M31, observed to a uniform depth of four orbits in F5555W(V) and F814W(I) using WFPC2 on board HST. Additionally we have reanalyzed HST archival data of comparable quality, for 2 more clusters. A special feature of our analysis is the extraordinary care taken to account for the effects of blended stellar images and required subtraction of con...

Astronomy and Astrophysics Deep Vlt Search for Globular Clusters in Ngc 5128: Color-magnitude Diagrams and Globular Cluster Luminosity Function ⋆

At the distance of NGC 5128 (3.6±0.2 Mpc) it is possible to resolve globular clusters with high resolution imaging from the ground, thus allowing the globular cluster candidate selection primarily through their morphological properties. I report the discovery of 71 globular clusters in NGC 5128 on VLT UT1+FORS1 images, including the faintest members (MV ∼ −5) known to date in this galaxy as wel...

Calibration : I . HST Color - Magnitude Diagrams of 8 Globular Clusters in M 31