Heavy-element abundances in a sample of low-metallicity blue compact galaxies

Details Heavy-element abundances in a sample of low-metallicity blue compact galaxies Heavy-element abundances in a sample of low-metallicity blue compact galaxies

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ysc..conf...63s&link_type=abstract

12th Young Scientists' Conference on Astronomy and Space Physics, held in Kyiv, Ukraine, April 19-23, 2005, Eds.: Simon, A.; Gol

Physics

Space Physics

Scientific paper

In this work we present high-quality spectroscopic observations of 26 supergigant HII regions in 22 low-metallicity blue compact galaxies with oxygen abundances with oxygen 12+logo/H between 7.2 and 8.4 (). The data was used to determine abundances for the elements N, O, Ne, S, Ar, and Fe. Some aspects of their origin have been discussed and constrain current nucleosynthesis stellar models. The main result of the present study is that the -elements-to-oxygen abundance ratios Ne/O, Si/O, S/O and Ar/O show no dependence on oxygen abundance. This result is to be expected from stellar nucleosynthesis theory as oxygen and all -elements are produced by the same massive stars ( ). The dispersion of the N/O ratio is found to be remarkably small. This can only be understood if primary N is produced in massive stars, not in intermediate mass ( ). The small dispersion in the heavy elements abundance ratios suggest that there is not a large IMF variations between BCGs with different metallicities.

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