Computer Science
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988s%26t....75..134s&link_type=abstract
Sky and Telescope (ISSN 0037-6604), vol. 75, Feb. 1988, p. 134-137.
Computer Science
Hertzsprung-Russell Diagram, Magellanic Clouds, Red Giant Stars, Stellar Spectra, Stellar Winds, Supernova 1987A, Absorption Spectra, Blue Stars, Line Spectra, Shock Waves
Scientific paper
The advances in understanding that have been made concerning SN 1987A in the year since it appeared are reviewed. The rapidity of the initial rise in brightness and the relatively faint absolute magnitude during the first few weeks have been found to be due to the progenitor star's being a blue giant, relatively small compared to a red giant. The nitrogen lines in the spectrum are evidence that the star was once a red giant whose stellar wind was so strong that the resulting loss of material converted the star into a blue giant. The variations in the light curve of the supernova are explained in terms of the radioactive decay of Ni-56 and Co-56 and the interaction of the resulting gamma rays with the debris cloud. Some of the remaining unanswered questions are summarized.
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