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37 papers · 1 filter
Uncertainties in asteroseismic grid-based estimates of stellar ages. SCEPtER: Stellar CharactEristics Pisa Estimation gRid
G. Valle, M. Dell'Omodarme, P. G. Prada Moroni +1
We study the impact on stellar age determination by means of grid-based techniques adopting asteroseismic constraints of the uncertainty in the radiative opacity, in the initial he…
The temperature distribution of horizontal branch stars: methods and first results
E. P. Lagioia, E. Dalessandro, F. R. Ferraro +4
As part of a large project aimed at characterizing the ultraviolet (UV) properties of globular clusters, we present here a theoretical and observational analysis aimed at setting t…
On the distance of the globular cluster M4 (NGC 6121) using RR Lyrae stars: I. optical and near-infrared Period-Luminosity and Period-Wesenheit relations
V. F. Braga, M. Dall'Ora, G. Bono +16
We present new distance determinations to the nearby globular M4 (NGC~6121) based on accurate optical and Near Infrared (NIR) mean magnitudes for fundamental (FU) and first overton…
A new study of the Ne(p,)Na reaction deep underground: Feasibility, setup, and first observation of the 186 keV resonance
F. Cavanna, R. Depalo, M. -L. Menzel +28
The Ne(p,)Na reaction takes part in the neon-sodium cycle of hydrogen burning. This cycle is active in asymptotic giant branch stars as well as in novae and contri…
A Forming Wide Polar Ring Galaxy at z~0.05 in the VST Deep Field of the Fornax Cluster
E. Iodice, M. Capaccioli, M. Spavone +5
We present the first deep photometry of a good candidate for a forming polar ring galaxy at redshift z~0.05. This object, named FCSS J033710.0-354727, is a background galaxy in the…
The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. II. The seven stellar populations of NGC7089 (M2)
A. P. Milone, A. F. Marino, G. Piotto +17
We present high-precision multi-band photometry for the globular cluster (GC) M2. We combine the analysis of the photometric data obtained from the Hubble Space Telescope UV Legacy…