We have obtained [Mg/Fe] for around 77% of the stars of the MILES library of stellar spectra in order to include this important information into simple stellar population (SSP) models. The abundance ratios, which were carefully calibrated to a single uniform scale, were obtained through a compilation from high spectral resolution works plus robust

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This is a pilot study part of a larger program devoted to understand the influence of bars in the evolution of galaxy disks. Some of the goals of this observational program are to compare the stellar metallicity gradients of galaxies with and without bars, the role of bars in the redistribution of mass and angular momentum and to study the

Our new infrared spectra of asteroid 24 Themis indicate water ice is not only present but also widespread on its surface. Our identification of water ice agrees with recent preliminary results, and our spectra also show evidence of organic compounds on this asteroid.

We study the evolution of the red sequence and the blue cloud since z ~ 1 to present in GOODS-S field for MB ≤ -20 and M* ≥ 1010 M&sun; selected galaxies. We segregate the galaxies in early-type galaxies (ET, E/S0/Sa), and late-type galaxies (LT, Sb-Irr) by their position in the concentration-asymmetry plane, while in passive and star-forming by

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