Spectra of high-metallicity [12+log(O/H)>~8.2] HII regions, where oxygen auroral lines are measurable in both the O+ and O++ zones, have been extracted from the Data Release 6 of the Sloan Digital Sky Survey (SDSS). Our final sample consists of 181 SDSS spectra of HII regions in galaxies in the redshift range from ~0.025 to ~0.17. The t2,O-t3,O

Not Available (2 data files).

Using the Coudé Echelle Spectrograph fed by the 1.4 m Coudé Auxiliary Telescope at ESO, La Silla, the authors have obtained a sequence of fourteen high resolution (λ/Δλ = 105) spectra at high signal to noise ratio, of main sequence and near main sequence objects in the wavelength range containing the 6708 Å resonance doublet of lithium. Using

We derive atmospheric parameters and lithium abundances for 671 stars and include our measurements in a literature compilation of 1381 dwarf and subgiant stars. First, a "lithium desert" in the effective temperature (T eff) versus lithium abundance (A Li) plane is observed such that no stars with T eff ~= 6075 K and A Li ~= 1.8 are found. We

We present a new estimate of the lithium abundance in the atmosphere of the brown dwarf LP944-20. Our analysis is based on a self-consistent analysis of low-, intermediate- and high-resolution optical and near-infrared spectra. We obtain logN(Li) = 3.25 +/- 0.25 using fits of our synthetic spectra to the LiI resonance line doublet profiles observed

High-resolution spectra (range 655-675 nm) are presented of the pre-main sequence triple system UX Tau. Favorable seeing conditions allowed detection of the spectra of the faintest component, where detection of the H-alpha and the Li-I 670.7 nm feature are reported. An estimate of effective temperature, luminosity, and mass leads to the conclusion