Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002rmxac..12..201l&link_type=abstract
Ionized Gaseous Nebulae, a Conference to Celebrate the 60th Birthdays of Silvia Torres-Peimbert and Manuel Peimbert, Mexico City
Astronomy and Astrophysics
Astronomy
1
Galaxies: Abundances, Galaxies: Irregular, Galaxies: Starburst, H Ii Regions
Scientific paper
In an effort to understand the evolution of N, O, and He abundances in gas-rich dwarf galaxies, we investigate the dispersion and mixing of supernova ejecta in relation to H II region evolution and develop a numerical model of chemical evolution based on a double-bursting mode of star formation (with an interval of the order of 3×10^7 years between bursts of a pair) which has been designed to account for the existence of significant scatter in the N/O-O/H relation. The dependence of the abundances on gas fraction is explored on the basis of this and similar models, in combination with various hypotheses concerning inflow and selective and non-selective outflow. The gas fractions are uncertain within wide limits for blue compact galaxies, but more well defined for some dwarf irregulars. Selective winds do not give a good fit to N/O, while closed models and models with non-selective winds with or without inflow are all found to be viable.
Larsen Thommy I.
Pagel Bernard E. J.
Sommer-Larsen Jesper
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