On the Primordial Helium Abundance and the Δ Y/Δ O Ratio
We present a review on the determination of the primordial helium abundance, Y_p, based on the study of hydrogen and helium recombination lines in extragalactic...
On the radial distribution of white dwarfs in the Galactic globular cluster omega Cen
We present deep and accurate photometry (F435W, F625W, F658N) of the Galactic Globular Cluster omega Cen collected with the Advanced Camera for Surveys (ACS) on...
On the Radial Velocity Distribution of the Carina dSph galaxy
We present the radial velocity (RV) distribution of Carina dSph, obtained using low-, medium- and high-resolution spectroscopic data collected with FORS2 and...
On the Relation between Radio and Non-Radio Elliptical Galaxies
Empirical evidence suggests that elliptical galaxies hosting a radio source may not be different from normal non-radio ellipticals. To test this possibility, we...
On the relation of the Duvall phase function to the upper layers on the convection zone
A method to obtain the Duvall phase function from the structure of a stellar model is presented. This can be a good tool for understanding the dependence of p...
On the relationship between dynamical masses from spectral features in emission and other mass estimators for a sample of local star-forming galaxies
We have obtained both virial and dynamical masses of a sample oflocal star forming galaxies from the UCM survey. The rotational curvesmeasured using the...