SCIENTIFIC INTEREST

The field of research concerns the study of stellar objecs, with particular attention to the physical conditions of the line forming regions, using the techniques of UV-NIR spectroscopy and photometry.

- Chemical composition of cool stars:
optical and UV spectra of late-type stars have been studied; The physical characteristics and chemical abundances of 26 K giants were determined from high resolution optical spectra. In the ultraviolet spectral range the most important result has been the determination of the "perfect solar analog" coincident with that determinedin the optical range.

-Study of the interaction between the components of close binary systems:
(X-ray binaries and symbiotic stars) with particular attention to mass exchange processes giving origin to high energy phenomena and formation of circumstellar accretion disks.

- Pre-main sequence stars(T Tauri, Herbig Ae/Be):
phenomenological interpretation and modelling of the accretion mass processes from the circumstellar matter. For both classes of objects the physical conditions of the emission line forming regions are determined by the self absorption curve method of analysis of the line fluxes. This method enables informations on level populations, column density and the size of the line emitting regions to be obtained without assuming local thermodynamic equilibrium. Multiwavelength monitoring of particular systems are in progress in order to study both the secular variations and short term variability.

-Structure and evolution of high luminosity stars
(LBV and WR stars) for which the emission line spectra are due to the strong stella wind; study of the mass loss and effects of interaction of the stellar wind with the circumstellar matter; origin of circumstellar nebulae;

 

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ACTIVITY REPORTS ( IN ITALIAN )

    1981-1984     1984-1987     1987-1990     1990-1993     1993-1996     1996-1999     1999-2002     2002-2008

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