Abstract
ABSTRACT This object was discovered ~ 15 days before maximum light and was observed photometrically over a period of five weeks. A spectrum obtained near maximum shows that this supernova was a relatively distant Type-Ib event. Like other Type-Ib supernovae, 1984I was characterized by a red (B - V) color and low absolute magnitude at maximum. Comparison with preoutburst photographs shows that this supernova was located in an interarm region, approximately 1 kpc from the nearest bright H II region. It is important to be able to distinguish supernovae of this type from Ia events, considering the interest in using the latter objects as cosmological standard candles.
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