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Improved Hubble Space Telescope Proper Motions for Tycho-G and Other Stars in the Remnant of Tycho's Supernova 1572
L. R. Bedin, P. Ruiz-Lapuente, J. I. Gonzalez Hernandez +4
With archival and new Hubble Space Telescope observations we have refined the space-velocity measurements of the stars in the central region of the remnant of Tycho's supernova (SN…
Global and non-global parameters of horizontal branch morphology of globular clusters
A. P. Milone, A. F. Marino, A. Dotter +10
The horizontal branch (HB) morphology of globular clusters (GCs) is mainly determined by metallicity. However, the fact that GCs with almost the same metallicity exhibit different…
The ACS survey of globular clusters. XIII. Photometric calibration in comparison with Stetson standards
Maren Hempel, Ata Sarajedini, Jay Anderson +11
In this study we compare the photometric data of 34 Milky Way globular clusters, observed within the ACS Treasury Program (PI: Ata Sarajedini) with the corresponding ground-based d…
The M4 Core Project with HST --- I. Overview and First-Epoch
L. R. Bedin, J. Anderson, D. C. Heggie +14
We present an overview of the ongoing Hubble Space Telescope large program GO-12911. The program is focused on the core of M4, the nearest Galactic globular cluster, and the observ…
Atmospheric Parameters and Metallicities for 2191 stars in the Globular Cluster M4
Luca Malavolta, Christopher Sneden, Giampaolo Piotto +3
We report new metallicities for stars of Galactic globular cluster M4 using the largest number of stars ever observed at high spectral resolution in any cluster. We analyzed 7250 s…
Helium enhanced stars and multiple populations along the horizontal branch of NGC2808: direct spectroscopic measurements
A. F. Marino, A. P. Milone, N. Przybilla +15
We present an abundance analysis of 96 horizontal branch (HB) stars in NGC2808, a globular cluster exhibiting a complex multiple stellar population pattern. These stars are distrib…