The type Ib supernova 1984L in NGC 991

Details The type Ib supernova 1984L in NGC 991 The type Ib supernova 1984L in NGC 991

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98..577s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 98, Aug. 1989, p. 577-589, 740, 741.

Astronomy and Astrophysics

Astronomy

54

Astronomical Photometry, Astronomical Spectroscopy, Supernovae, Cobalt Isotopes, Light Curve, Luminosity, Nickel Isotopes, Radioactive Decay, Supernova 1987A, Visible Spectrum, White Dwarf Stars

Scientific paper

Photometry from about 380 to about 520 days past maximum and spectroscopy at about 400 days past maximum were obtained for the type Ib SN 1984L. The late-time light curve is characterized by an exponential decline with an e-folding time of about 116 days, and it is dominated by forbidden O-I 6300-6363-A emission. If the observed flux is due to the radioactive decay of Co-56, the results imply an initial Ni-56 mass of about 0.1 solar masses. The required oxygen mass (about 1 solar mass) and the derived ratios of Mg/O and Mg/C suggest that this Ib SN Ib originated in a star of about 20 solar masses. Comparisons are made with the type II SN 1980K and SN 1987A, the type Ib SN 1985F and SN 1987K, and models.

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