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GeMS MCAO observations of the Galactic globular cluster NGC 2808: the absolute age
Davide Massari, G. Fiorentino, A. McConnachie +7
Globular clusters are the oldest stellar systems in the Milky Way and probe the early epoch of the Galaxy formation. However, the uncertainties on their absolute age are still too…
The Carina Project IX: on Hydrogen and helium burning variables
G. Coppola, M. Marconi, P. B. Stetson +14
We present new multi-band (UBVI) time-series data of helium burning variables in the Carina dwarf spheroidal galaxy. The current sample includes 92 RR Lyrae-six of them are new ide…
Towards Precision Photometry with Extremely Large Telescopes: the Double Subgiant Branch of NGC 1851
P. Turri, A. W. McConnachie, P. B. Stetson +4
The Extremely Large Telescopes currently under construction have a collecting area that is an order of magnitude larger than the present largest optical telescopes. For seeing-limi…
Variable Stars in Local Group Galaxies. I: Tracing the Early Chemical Enrichment and Radial Gradients in the Sculptor dSph with RR Lyrae Stars
C. E. Martínez-Vázquez, M. Monelli, G. Bono +7
We identified and characterized the largest (536) RR Lyrae (RRL) sample in a Milky Way dSph satellite (Sculptor) based on optical photometry data collected over 24 years. The…
The absolute age of the globular cluster M15 using near-infrared adaptive optics images from PISCES/LBT
M. Monelli, V. Testa, G. Bono +26
We present deep near-infrared (NIR) J, Ks photometry of the old, metal-poor Galactic globular cluster M\,15 obtained with images collected with the LUCI1 and PISCES cameras availab…