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Spectra of binaries classified as lambda Boo stars
R. Faraggiana, M. Gerbaldi, P. Bonifacio +1
High angular resolution observations have shown that some stars classified as lambda Boo are binaries with low values of angular separation and magnitude difference of the componen…
Measurement of stellar age from uranium decay
R. Cayrel, V. Hill, T. Beers +10
The ages of the oldest stars in the Galaxy indicate when star formation began, and provide a minimum age for the Universe. Radioactive dating of meteoritic material and stars relie…
Ionization Properties and Elemental Abundances in Damped Ly alpha Systems
Giovanni Vladilo, Miriam Centurion, Piercarlo Bonifacio +1
We analyze extant data of Al++, Al+ and other low ions with the aim of studying the ionization properties of Damped Ly alpha systems (DLAs) from the analysis of the ratio R(Al++/Al…
A speckle interferometry survey of lambda Bootis stars
E. Marchetti, R. Faraggiana, P. Bonifacio
A search for duplicity of lambda Bootis stars has been made by using the speckle camera installed at the Telescopio Nazionale Galileo. The operation mode and the reduction procedur…
VLT/Uves Observations of the Dla at Z=3.39 towards QSO 0000-2621
P. Molaro, P. Bonifacio, M. Centurion +3
UVES observations at ESO/VLT of the DLA at z=3.39 towards QSO 0000-2621 provided refined abundances for Fe, Si, N, Ni, and new abundances for O, Ar, P, Zn, Cr, H2. These determinat…
Detailed Chemical Analysis of Two Giants in the SGR DSPH
P. Bonifacio, P. Molaro
The 8m class telescopes allow for the first time to study stars of external galaxies with the same resolution and S/N ratio which has been so far used for Galactic stars. It is qui…