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61 papers · 2 filters
The elusive old population of the dwarf spheroidal galaxy Leo I
Enrico V. Held, Ivo Saviane, Yazan Momany +1
We report the discovery of a significant old population in the dwarf spheroidal (dSph) galaxy Leo I as a result of a wide-area search with the ESO New Technology Telescope. Studies…
Bipolar jets from the symbiotic star Hen 3-1341 in outburst
Toma Tomov, Ulisse Munari, Paola Marrese
The spectral signature of collimated bipolar jets have been discovered on high resolution spectra of Hen 3-1341 during the 1999 outburst, the first ever recorded for this symbiotic…
The stellar populations of the Fornax dwarf spheroidal galaxy
Ivo Saviane, Enrico V. Held, Gianpaolo Bertelli
(abridged) We present B,V,I CCD photometry of about 40000 stars in four regions of the Fornax dSph. Using the resultant CMDs, many already known age-tracers are investigated, and n…
Clump stars in the Solar Neighbourhood
Leo Girardi
Hipparcos data has allowed the identification of a large number of clump stars in the Solar Neighbourhood. We discuss our present knowledge about their distributions of masses, age…
An evolutionary model for GHz Peaked Spectrum Sources. Predictions for high frequency surveys
G. De Zotti, G. L. Granato, L. Silva +2
We have explored, in the general framework of the ``young source'' scenario, evolutionary models for GHz Peaked Spectrum (GPS) galaxies and quasars which reproduce the observed cou…
Old Open Clusters as Tracers of Galactic Evolution
A. Bragaglia, M. Tosi, G. Marconi +1
Old open clusters are useful tools to study the Galactic disk properties, both present and past. Populous samples with properties determined both accurately and homogenously are ne…