Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...452..473d&link_type=abstract
Astronomy and Astrophysics, Volume 452, Issue 2, June III 2006, pp.473-480
Astronomy and Astrophysics
Astrophysics
14
Galaxies: Abundances, Galaxies: Evolution, Ism: Abundances, Ism: Hii Regions
Scientific paper
Aims.To derive O/H, N/O, and S/O abundances of ion{H}{ii} regions located in nine Virgo spiral galaxies, as well as to verify what is the cause of the abundance segregation found. Methods: .We employed photoionization models to reproduce observed emission-line intensities of ion{H}{ii} regions located in the galaxies considered. The abundance gradients obtained were interpreted using a grid of chemical evolution models. Results: .Our models indicate that galaxies near to the core of the Virgo cluster are overabundant in O/H, N/O, and S/O by about 0.25 dex in comparison to the ones at the periphery. With one exception, models with upper stellar mass limit of Mu = 30-40 M&sun; and age of the ionizing star cluster ranging from 1.5 to 2.5 Myr were able to reproduce the observational data. Chemical models indicate the collapse time-scale for inner regions of galaxies near to the Virgo core is larger than the one in galaxies located at the intermediate and peripheral positions in the cluster, what can be due to the dense environment existing in Virgo Cluster core.
Copetti Marcus V. F.
Dors L.. Jr. O.
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