Chemical and photometric evolution models for disk, irregular and low mass galaxies

We summarize the updated set of multiphase chemical evolution models performed with 44 theoretical radial mass initial distributions and 10 possible values of efficiencies to form molecular clouds and stars. We present the results about the infall rate histories, the formation of the disk, and the evolution of the radial distributions of diffuse and molecular gas surface density, stellar profile, star formation rate surface density and elemental abundances of C,N, O and Fe, finding that the radial gradients for these elements begin very steeper, and flatten with increasing time or decreasing redshift, although the outer disks always show a certain flattening for all times. With the resulting star formation and enrichment histories, we calculate the spectral energy distributions (SEDs) for each radial region by using the ones for single stellar populations resulting from the evolutive synthesis model {\sc popstar}. With these SEDs we may compute finally the broad band magnitudes and colors radial distributions in the Johnson and in the SLOAN/SDSS systems which are the main result of this work. We present the evolution of these brightness and color profiles with the redshift.Comment: 22 pages, 18 figures, accepted in Advances in Astronom

Stellar populations in the center of barred spiral galaxies

We show observations obtained with the integral field spectrometer OASIS for the central regions of a sample of barred galaxies. The high spatial resolution of the instrument allows to distinguish various structures within these regions as defined by stellar populations of different ages and metallicities. From these data we obtain important clues about the star formation history. But we advise that, in order to obtain adequately the evolutionary sequence, a combination of chemical and synthesis models may be necessary.Comment: 4 pages, 2 figures, submitted to the IAU245 Symposium Formation and Evolution of Galaxy Bulge

Radial gradients of abundances

The final publication is available at link.springer.co

Galactic chemical evolution: Stellar yields and the initial mass function

We present a set of 144 Galactic chemical evolution models applied to a Milky Way analogue, computed using four sets of low+intermediate star nucleosynthetic yields, six massive star yield compilations, and six functional forms for the initial mass function. A comparison is made between a grid of multiphase chemical evolution models computed with these yield combinations and empirical data drawn from the Milky Way's disc, including the solar neighbourhood. By means of a χ2 methodology, applied to the results of these multiphase models, the best combination of stellar yields and initial mass function capable of reproducing these observations is identified

Damped Lyα systems as spiral galaxies

This is an electronic version of an article published in The Astrophysical Journal. Clavel, J. et al. Damped Lyα systems as spiral galaxies. The Astrophysical Journal 487 (1997): 29-3

Evolution of spiral galaxies. VII. Time evolution of the radial distributions of abundances

This is an electronic version of an article published in The Astrophysical Journal. Mollá, M., Ferrini, F. and A.I. Díaz. Evolution of spiral galaxies. VII. Time evolution of the radial distributions of abundances. The Astrophysical Journal 475 (1997): 519-53