Observations of the type II supernova 1986I in M99
Article 1989 en
Authors
CP
C. Pennypacker
MB
M. S. Burns
FC
Frank S. Crawford
Abstract
1 min read
We report spectra for the first seven weeks and photometry for the first seven months of supernova SN 1986I in M99. This object was below our detection threshold of about 16.6 mag on 8 May (UT), and was first detected in an image obtained on 17 May (UT). From its first spectrum (taken on 20 May UT), SN 1986I exhibited strong Hα emission. During the first three months after detection, the light curves in V, R, and I dropped slowly (+0.01 mag/day or less), indicating a Type II plateau supernova. The SN then disappeared behind the Sun for 75 days, re-emerging about 1.5 mag dimmer than predicted by linear extrapolation of the light curves of the first three months. We have measured the wavelengths and velocities of the stronger emission and absorption features, with standard identifications.
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