Showing 2000Show all
3 papers · 1 filter
astro-ph2000
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…
astro-ph2000
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…
astro-ph2000
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…