Journal
ASTRONOMICAL JOURNAL
Volume 120, Issue 3, Pages 1487-1498Publisher
IOP PUBLISHING LTD
DOI: 10.1086/301518
Keywords
binaries : close; stars : evolution; stars : mass loss; supernovae : general; supernovae : individual (SN 1993J)
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We present 42 low-resolution spectra of supernova (SN) 1993J, our complete collection from the Lick and Keck observatories, from day 3 after explosion to day 2454, as well as one Keek high-dispersion spectrum from day 383. SN 1993J began as an apparent SN II, albeit an unusual one. After a few weeks, a dramatic transition took place, as prominent helium lines emerged in the spectrum. SN 1993J had metamorphosed from a SN II to a SN IIb Nebular spectra of SN 1993J closely resemble those of SNe Ib and Ic, but with a persistent H alpha line. At very late times, the H alpha emission line dominated the spectrum, but with an unusual, boxlike profile. This is interpreted as an indication of circumstellar interaction.
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