We discuss results on the oxygen abundance in a sample of 23 metal-poor (-3.0≤ [Fe/H] ≤ -0.3) unevolved stars and one giant. High resolutionspectroscopy of OH...
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PublicationNew Views on the Early Evolution of Oxygen in the Galaxy
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PublicationNGC 3109: Halo/Disk Structures in Faint Galaxies
We present here preliminary results of our wide-field study of NGC 3109: a low luminosity galaxy in the outskirts of the Local Group. Its edge-on orientation...
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PublicationNGC 3521: Stellar Counter-Rotation Induced by a Bar Component
The spiral galaxy NGC 3521 exhibits apparently normal kinematic properties of gas and stars along its major axis. However, the analysis of the LOSVD reveals...
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PublicationNon-instantaneous gas recycling and chemical evolution in N-body disk galaxies
After briefly recalling basic facts about the metallicity gradients inspiral galaxies, we summarize two recent N-body gas-dynamical modelsthat implement a non...
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PublicationOn the initial cluster mass distribution inferred from synthesis models
In this contribution we examine the problem of inferring ages and initial cluster masses from synthesis models at the limit of low-mass clusters ( M≤ a few ×104...
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PublicationOn the Light-Profiles of Spiral Galaxy Bulges and the Hubble Sequence for Spirals
Recent studies have claimed that the Hubble sequence of late-type spirals, and spirals in general, is scale-free. Within the photometric data used in these...
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PublicationOn the Nature of Damped LYα Systems: Clues from Determinations of Elemental Abundance Ratios
We present a study of the [α/Fe-peak] and [N/α] abundance ratios in Damped Lyα (DLA) systems. By using ratios of undepleted elements ([S/Zn] and [N/S]) or when...
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PublicationOn the Origin of S0 Stellar Populations
We investigate a one-zone chemo-photometric evolutionary model of truncated spiral galaxies with and without starbursts in order to explore the origin of the...
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PublicationOn the origin of the compact H ii regions around massive stellar clusters
The existence of compact H ii regions around massive stellar clusters with ages exceeding several Myr challenges our understanding of the physical processes...