An Observational Limit on Circumstellar H-Alpha from Supernova 1994D

/ Authors

R. Cumming, P. Lundqvist, L. Smith, M. Pettini, D. King

/ Abstract

. We searched for narrow H(cid:11) in a high-resolution spectrum of SN 1994D taken 10 days before maximum, and found none. We estimate the limit this places on the progenitor mass loss, and (cid:12)nd that it is competitive with recent radio limits, and excludes the highest-mass-loss-rate symbiotic systems as possible progenitors of the normal Type Ia SN 1994D.