Title:
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An observational limit on circumstellar H-alpha from supernova 1994D
(Stockholm Observatory preprint No. 60)

Authors:
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Robert J. Cumming & Peter Lundqvist (Stockholm Observatory),
Linda J. Smith (Univ. College London, U.K.) and
Max Pettini & David L. King (Royal Greewich Observatory, U.K.)

Abstract:
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We searched for narrow H-alpha 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 find 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.

To published in:
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Proceedings of the NATO Advanced Study Institute on Thermonuclear
Supernovae, ed. R. Canal, P. Ruiz-Lapuente, & J. Isern (Dordrecht:Kluwer)