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The Age of the Old Metal-Poor Globular Cluster NGC6397 Using WFC3/IR Photometry
Matteo Correnti, Mario Gennaro, Jason S. Kalirai +2
Globular Clusters (GCs) in the Milky Way represent the ideal laboratory to establish the age of the oldest stellar populations and to measure the color-magnitude relation of stars.…
Orbital and atmospheric characterization of the planet within the gap of the PDS 70 transition disk
A. Müller, M. Keppler, Th. Henning +43
Aims: We aim to characterize the orbital and atmospheric properties of PDS 70 b, which was first identified on May 2015 in the course of the SHINE survey with SPHERE, the extreme a…
The WFC3 Galactic Bulge Treasury Program: Relative Ages of Bulge Stars of High and Low Metallicity
Alvio Renzini, Mario Gennaro, Manuela Zoccali +6
The HST/WFC3 multiband photometry spanning from the UV to the near-IR of four fields in the Galactic bulge, together with that for six template globular and open clusters, are used…
The initial mass function in the Coma Berenices dwarf galaxy from deep near-infrared HST observations
Mario Gennaro, Marla Geha, Kirill Tchernyshyov +6
We use deep WFC3/IR imaging to study the Initial Mass Function (IMF) of the ultra faint dwarf galaxy Coma Berenices (Com Ber). Our observations reach the lowest stellar mass…
Chemically-dissected rotation curves of the Galactic Bulge from Main Sequence proper motions
William I. Clarkson, Annalisa Calamida, Kailash C. Sahu +9
We report results from an exploratory study implementing a new probe of Galactic evolution using archival Hubble Space Telescope imaging observations. Precise proper motions are co…
Evidence of a non universal stellar Initial Mass Function. Insights from HST optical imaging of 6 Ultra Faint Dwarf Milky Way Satellites
Mario Gennaro, Kirill Tchernyshyov, Thomas M. Brown +9
Using deep HST/ACS observations, we demonstrate that the sub-solar stellar initial mass function (IMF) of 6 ultra-faint dwarf Milky Way Satellites (UFDs) is more bottom light than…