Optical Spectroscopy of Supernova 1993J During Its First 2500 Days
Abstract
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 Keck 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 Hα line. At very late times, the Hα emission line dominated the spectrum, but with an unusual, boxlike profile. This is interpreted as an indication of circumstellar interaction.
- Publication:
-
The Astronomical Journal
- Pub Date:
- September 2000
- DOI:
- 10.1086/301518
- arXiv:
- arXiv:astro-ph/0006263
- Bibcode:
- 2000AJ....120.1487M
- Keywords:
-
- Stars: Binaries: Close;
- Stars: Evolution;
- Stars: Mass Loss;
- Stars: Supernovae: General;
- supernovae: individual (SN 1993J);
- Astrophysics
- E-Print:
- 19 pages plus 13 figures, AASTeX V5.0. One external table in AASTeX V4.0, in landscape format. Accepted for publication in AJ