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Disentangling multiple stellar populations in globular clusters using the Strömgren system
J. Alonso-García, M. Catelan, P. Amigo +10
An increasing amount of spectroscopic and photometric evidence is showing that the stellar populations of globular clusters are not as simple as they have been considered for many…
Variable stars in the Globular Cluster NGC 2808
Andrea Kunder, Peter B. Stetson, Marcio Catelan +2
The first calibrated broadband BVI time-series photometry is presented for the variable stars in NGC 2808, with observations spanning a range of twenty-eight years. We have also re…
The Horizontal Branch of NGC 1851: Constraints from its RR Lyrae Variables
Andrea Kunder, Maurizio Salaris, Santi Cassisi +5
We use the pulsational properties of the RR Lyrae variables in the globular cluster NGC 1851 to obtain detailed constraints of the various sub-stellar populations present along its…
Double Horizontal Branches in NGC 6440 and NGC 6569 unveiled by the VVV Survey
Francesco Mauro, Christian Moni Bidin, Roger Cohen +5
We report the discovery of a peculiar horizontal branch (HB) in NGC 6440 and NGC 6569, two massive and metal-rich Galactic globular clusters (GGCs) located in the Galactic bulge, w…
Massive open star clusters using the VVV survey II. Discovery of six clusters with Wolf-Rayet stars
A. -N. Chené, J. Borissova, C. Bonatto +20
Context: The ESO Public Survey "VISTA Variables in the Vía Láctea" (VVV) provides deep multi-epoch infrared observations for an unprecedented 562 sq. degrees of the Galactic bulge,…
Variable Stars in Large Magellanic Cloud Globular Clusters II: NGC 1786
Charles A. Kuehn, Horace A. Smith, Marcio Catelan +3
This is the second in a series of papers studying the variable stars in Large Magellanic Cloud globular clusters. The primary goal of this series is to study how RR Lyrae stars in…
Milky Way demographics with the VVV survey. I. The 84-million star colour-magnitude diagram of the Galactic bulge
R. K. Saito, D. Minniti, B. Dias +9
The Milky Way (MW) bulge is a fundamental Galactic component for understanding the formation and evolution of galaxies, in particular our own. The ESO Public Survey VISTA Variables…
Effects of Helium Enrichment in Globular Clusters I.Theoretical Plane with PGPUC stellar evolution code
A. A. R. Valcarce, M. Catelan, A. V. Sweigart
Recently, the study of globular cluster (GC) CMDs has shown that some of them harbor multiple populations with different chemical compositions and/or ages. In the first case, the m…
Massive open star clusters using the VVV survey I. Presentation of the data and description of the approach
A. -N. Chené, J. Borissova, J. R. A. Clarke +15
Context: The ESO Public Survey "VISTA Variables in the Vía Láctea" (VVV) provides deep multi-epoch infrared observations for an unprecedented 562 sq. degrees of the Galactic bulge,…
Stellar Archaeology in the Galactic halo with Ultra-Faint Dwarfs: VII. Hercules
Ilaria Musella, Vincenzo Ripepi, Marcella Marconi +13
We present the first time-series study of the ultra-faint dwarf galaxy Hercules. Using a variety of telescope/instrument facilities we secured about 50 V and 80 B epochs. These dat…
The complex case of V445 Lyr observed with Kepler: Two Blazhko modulations, a non-radial mode, possible triple mode RR Lyrae pulsation, and more
E. Guggenberger, K. Kolenberg, J. M. Nemec +13
Rapid and strong changes in the Blazhko modulation of RR Lyrae stars, as they have recently been detected in high precision satellite data, have become a crucial topic in finding a…
Stellar Archaeology in the Galactic halo with the Ultra-Faint Dwarfs: VI. Ursa Major II
M. Dall'Ora, K. Kinemuchi, V. Ripepi +11
We present a B, V color-magnitude diagram (CMD) of the Milky Way dwarf satellite Ursa Major II (UMa II), spanning the magnitude range from V ~ 15 to V ~ 23.5 mag and extending over…
Detailed abundances in stars belonging to ultra-faint dwarf spheroidal galaxies
P. François, L. Monaco, S. Villanova +7
We report preliminary results concerning the detailed chemical composition of metal poor stars belonging to close ultra-faint dwarf galaxies (hereafter UfDSphs). The abundances hav…