The forbidden O I 6300, 6364 A doublet of SN 1987A

Astronomy and Astrophysics – Astrophysics

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Stellar Evolution, Stellar Spectra, Supernova 1987A, Emission Spectra, Line Spectra, Stellar Envelopes, Stellar Models

Scientific paper

Model calculations are presented to fit the evolution of the intensity and profile of the forbidden O I 6300, 6364 emission doublet observed in the spectrum of SN 1987A. The fact that the doublet ratio R = F(6300)/F(6364) is less than 3 is evidence that these lines are optically thick for t of approximately less than 1 yr after outburst. The oxygen is theorized to be distributed in a clumpy fashion throughout the supernova envelope. The data is fitted with a three-zone model having 1.3 solar mass of oxygen distributed within a freely expanding sphere with a volume fitting factor f of about 0.1. The temperature of the oxygen changed from about 4100 K at day 200 to about 2900 K at day 500.

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