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The ACS Survey of Galactic Globular Clusters. III. The Double Subgiant Branch of NGC 1851
A. P. Milone, L. R. Bedin, G. Piotto +13
Photometry with HST's ACS reveals that the subgiant branch (SGB) of the globular cluster NGC 1851 splits into two well-defined branches. If the split is due only to an age effect,…
The ACS Survey of Galactic Globular Clusters: M54 and Young Populations in the Sagittarius Dwarf Spheroidal Galaxy
Michael H. Siegel, Aaron Dotter, Steven R. Majewski +11
We present new Hubble Space Telescope photometry of the massive globular cluster M54 (NGC 6715) and the superposed core of the tidally disrupted Sagittarius (Sgr) dSph galaxy as pa…
The ACS Survey of Galactic Globular Clusters. II. Stellar Evolution Tracks, Isochrones, Luminosity Functions, and Synthetic Horizontal-Branch Models
A. Dotter, B. Chaboyer, D. Jevremovic +4
The ACS Survey of Galactic Globular Clusters, an HST Treasury Project, will deliver high quality, homogeneous photometry of 65 globular clusters. This paper introduces a new collec…
Stellar Population Models and Individual Element Abundances I: Sensitivity of Stellar Evolution Models
A. Dotter, B. Chaboyer, J. W. Ferguson +4
Integrated light from distant galaxies is often compared to stellar population models via the equivalent widths of spectral features--spectral indices--whose strengths rely on the…
The White Dwarf Cooling Sequence of NGC6397
Brad M. S. Hansen, Jay Anderson, James Brewer +10
We present the results of a deep Hubble Space Telescope (HST) exposure of the nearby globular cluster NGC6397, focussing attention on the cluster's white dwarf cooling sequence. Th…
The New Standard Stellar Population Models (NSSPM) -- The Prologue
Hyun-chul Lee, Guy Worthey, Scott C. Trager +7
We are developing a brand new stellar population models with flexible chemistry (isochrones plus stellar colors and spectra) in order to set a new standard of completeness and exce…