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[3.07] Chemical Properties of Star-Forming Emission Line Galaxies at z=0.1 - 0.5

C. Kobulnicky, D. Zaritsky (UC Santa Cruz)

We measure oxygen and nitrogen abundances for 14 star-forming emission line galaxies (ELGs) at 0.11 -1.4 like local spirals. These chemical properties are inconsistent with unevolved objects undergoing a first burst of star formation. The majority of the ELGs are presently ~4 magnitudes brighter and ~0.5 dex more metal-rich than the bulk of the stars in well-known metal-poor dwarf spheroidals such as NGC~205 and NGC~185, making an evolution between some ELGs and metal-poor dwarf spheroidals improbable. However, the data are consistent with the hypothesis that more luminous and metal-rich spheroidal galaxies like NGC~3605 may become the evolutionary endpoints of some ELGs.

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