Abstract
We review recent results on the oxygen and nitrogen
chemical abundances in extremely compact, low-mass
starburst galaxies at redshifts between 0.1-0.3
recently named to as "Green Pea" galaxies. These
galaxies are genuine metal-poor galaxies ($\sim$ one
fifth solar) with N/O ratios unusually high for
galaxies of the same metallicity. In combination with
their known general properties, i.e., size, stellar
mass and star-formation rate, these findings suggest
that these objects could be experiencing a short and
extreme phase in their evolution. The possible action
of both recent and massive inflow of gas, as well as
stellar feedback mechanisms are discussed here as main
drivers of the starburst activity and their oxygen and
nitrogen abundances.
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