7 papers
Sgr dSph: a bridge between Dwarf Galaxies and DLAs?
L. Sbordone, P. Bonifacio, G. Marconi +2
We present abundances for 12 giants in the Sagittarius Dwarf Spheroidal Galaxy (Sgr dSph) obtained from VLT - UVES spectra. Moving on a short period, polar orbit around the Milky W…
Ca II activity and rotation in F-K evolved stars
L. Pasquini, J. R. de Medeiros, L. Girardi
(Abridged) Ca II H and K high resolution observations for 60 evolved stars in the field and in 5 open clusters are presented. From these spectra chromospheric fluxes are derived, a…
First results of UVES at VLT: abundancesin the Sgr dSph
Piercarlo Bonifacio, Vanessa Hill, Paolo Molaro +3
Two giants of the Sagittarius dwarf spheroidal have been observed with the UVES spectrograph on the ESO 8.2m Kueyen telescope, during the commissioning of the instrument. Sgr 139 h…
Evolution of lithium in solar-type stars: clues from intermediate age clusters
S. Randich, L. Pasquini, R. Pallavicini
We present Li abundances for 14 solar-type stars in the intermediate age (~ 2 Gyr) clusters IC 4651 and NGC 3680. The log n(Li) vs. effective temperature distributions are compared…
A Super Lithium Rich giant in the metal-poor open cluster Berkeley 21
V. Hill, L. Pasquini
We present the analysis of FEROS commissioning spectra of 3 giants in the metal poor cluster Be 21. One of the giants has an exceptionally high Li content, comparable to the origin…
GRB 990510: linearly polarized radiation from a fireball
S. Covino, D. Lazzati, G. Ghisellini +12
Models for gamma-ray burst afterglows envisage an hyper-relativistic fireball that is decelerated in the ambient medium around the explosion site. This interaction produces a shock…