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37 papers · 2 filters
Dynamical age differences among coeval star clusters as revealed by blue stragglers
F. R. Ferraro, B. Lanzoni, E. Dalessandro +11
Globular star clusters that formed at the same cosmic time may have evolved rather differently from a dynamical point of view (because that evolution depends on the internal enviro…
The Infrared Telescope Facility (IRTF) spectral library: spectral diagnostics for cool stars
Mary Cesetti, A. Pizzella, V. D. Ivanov +3
The near-infrared (NIR) wavelength range offers some unique spectral features, and it is less prone to the extinction than the optical one. Recently, the first flux calibrated NIR…
The Na-O anticorrelation in horizontal branch stars. III. 47 Tuc and M 5
R. G. Gratton, S. Lucatello, A. Sollima +7
To check the impact of the multiple population scenario for globular clusters on their HB, we present an analysis of the composition of 110 red HB (RHB) stars in 47 Tucanae and of…
Spectroscopy of horizontal branch stars in Omega Centauri
C. Moni Bidin, S. Villanova, G. Piotto +3
We analyze the reddening, surface helium abundance and mass of 115 horizontal branch (HB) and blue hook (BH) stars in OmegaCentauri, spanning the HB from the blue edge of the insta…
Interacting Supernovae and Supernova Impostors. SN 2009ip, is this the end?
A. Pastorello, E. Cappellaro, C. Inserra +41
We report the results of a 3 year-long dedicated monitoring campaign of a restless Luminous Blue Variable (LBV) in NGC 7259. The object, named SN 2009ip, was observed photometrical…
BVRI lightcurves of supernovae SN 2011fe in M101, SN 2012aw in M95, and SN 2012cg in NGC 4424
U. Munari, A. Henden, R. Belligoli +4
Accurate and densely populated BVRcIc lightcurves of supernovae SN 2011fe in M101, SN 2012aw in M95 and SN 2012cg in NGC 4424 are presented and discussed. The SN 2011fe lightcurve…