Observations of the type II supernova 1986I in M99

Details Observations of the type II supernova 1986I in M99 Observations of the type II supernova 1986I in M99

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..186p&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 97, Jan. 1989, p. 186-193. Research supported by NSF and Research Corp.

Astronomy and Astrophysics

Astronomy

14

Astronomical Spectroscopy, Spiral Galaxies, Supernovae, Astronomical Photometry, Balmer Series, Continuous Spectra, H Alpha Line

Scientific paper

Spectra for the first seven weeks and photometry for the first seven months of supernova SN 1986 in M99 are reported. This object was below the detection threshold of about 16.6 mag on May 8 (UT), and was first detected in an image obtained on May 17 (UT). From its first spectrum (taken on May 20 UT), SN 1986I exhibited strong H-alpha 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, reemerging about 1.5 mag dimmer than predicted by linear extrapolation of the light curves of the first three months. The wavelengths and velocities of the stronger emission and absorption features, with standard identifications have been measured.

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