Other
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pasp..101..137p&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 101, Feb. 1989, p. 137-146.
Other
33
Emission Spectra, Infrared Spectra, Line Spectra, Supernova 1987A, H Alpha Line, Light Curve, Spectral Resolution
Scientific paper
Approximately three weeks after the outburst of SN 1987A, satellite emission 'bumps' suddenly appeared in the blue and red wings of H-alpha. Optical and infrared spectroscopic observations are analyzed in an attempt to better understand this event. These data show that comparable structure appeared in the profiles of several emission lines besides H-alpha, ruling out the possibility that the bumps were due to blends with lines of other elements. The velocities of the bumps in the rest frame of the supernova closely followed the velocity of the receding photosphere, which strongly suggests that the bump emission originated just above the photosphere. It seems likely that the appearance of the bumps was the first observable consequence of the arrival at the photosphere of energy associated with the radioactive decay of Ni-56 and Co-56. For this to have occurred less than a month after outburst implies that significant amounts of radioactive material had been mixed outward into the hydrogen envelope.
Heathcote Steve R.
Phillips Marcia
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