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Variable stars in two open clusters within the Kepler 2-Campaign-0 field: M 35 and NGC 2158
D. Nardiello, L. R. Bedin, V. Nascimbeni +15
We present a multi-year survey aimed at collecting (1) high-precision (~5 milli-mag), (2) fast-cadence (~3 min), and (3) relatively long duration (~10 days) multi-band photometric…
Stellar Models of Multiple Populations in Globular Clusters. I. The Main Sequence of NGC 6752
Aaron Dotter, Jason Ferguson, Charlie Conroy +3
We present stellar atmosphere and evolution models of main sequence stars in two stellar populations of the Galactic globular cluster NGC 6752. These populations represent the two…
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. I. Overview of the Project and Detection of Multiple Stellar Populations
G. Piotto, A. P. Milone, L. R. Bedin +23
In this paper we describe a new UV-initiative HST project (GO-13297) that will complement the existing F606W and F814W database of the ACS Globular Cluster (GC) Treasury by imaging…
The Gaia-ESO Survey: the most metal-poor stars in the Galactic bulge
L. Howes, M. Asplund, A. R. Casey +39
We present the first results of the EMBLA survey (Extremely Metal-poor BuLge stars with AAOmega), aimed at finding metal-poor stars in the Milky Way bulge, where the oldest stars s…
The s-Process Enrichment of the Globular Clusters M4 and M22
Luke J. Shingles, Amanda I. Karakas, Raphael Hirschi +4
We investigate the enrichment in elements produced by the slow neutron-capture process (-process) in the globular clusters M4 (NGC 6121) and M22 (NGC 6656). Stars in M4 have hom…
Nucleosynthesis in helium-enriched asymptotic giant branch models: Implications for Heavy Element Enrichment in Omega Centauri
Amanda I. Karakas, Anna F. Marino, David M. Nataf
We investigate the effect of helium enrichment on the evolution and nucleosynthesis of low-mass asymptotic giant branch (AGB) stars of 1.7Msun and 2.36Msun with a metallicity of Z=…