English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The ACS Survey of Galactic Globular Clusters, an HST Treasury Project, willdeliver high quality, homogeneous photometry of 65 globular clusters. Thispaper introduces a new collection of stellar evolution tracks and isochronessuitable for analyzing the ACS Survey data. Stellar evolution models werecomputed at [Fe/H]= -2.5, -2.0, -1.5, -1.0, -0.5, and 0; [alpha/Fe]= -0.2, 0,0.2, 0.4, 0.6, and 0.8; and three initial He abundances for masses from 0.1 to1.8 Msun and ages from 2 to 15 Gyr. Each isochrone spans a wide range inluminosity from Mv~14 up to the tip of the red giant branch. These arecomplemented by a set of He-burning tracks that extend from the zero agehorizontal branch to the onset of thermal pulsations on the asymptotic giantbranch. In addition, a set of computer programs are provided that make itpossible to interpolate the isochrones in [Fe/H], generate luminosity functionsfrom the isochrones, and create synthetic horizontal branch models. The tracksand isochrones have been converted to the observational plane with twodifferent color-Teff transformations, one synthetic and one semi-empirical, inground-based B, V, and I, and F606W and F814W for both ACS-WFC and WFPC2systems. All models and programs presented in this paper are available fromhttp://stellar.dartmouth.edu/~models/

The ACS Survey of Galactic Globular Clusters. II. Stellar Evolution Tracks, Isochrones, Luminosity Functions, and Synthetic Horizontal-Branch Models