Spectrophotometric and neutral hydrogen observations of Michigan 160

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Abstract
Spectrophotometry, deep optical imagery and neutral hydrogen observations of the emission-line galaxy Michigan 160 are presented. It is identified as a young, gas-rich system dominated by four massive H II regions. The galaxy has a disturbed optical structure suggestive of recent interaction, and it is probable that its neutral gas content (which exceeds 50 per cent of its total mass) is truly primordial. The metallicities and neutral gas fractions for Michigan 160 and a sample of similar emission-line and late-type galaxies are adequately explained by a chemical evolution model in which (i) the heavy element yield is constant (p=0.004) and (ii) the enrichment process is modified by inflow.

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