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Filamentary signs of a second supernova.

Filamentary signs of a second supernova The scattered residue of a supernova explosion provides a rare glimpse of material from the core of a massive star. In the case of the Puppis A supernova remnant, the unusual chemistry and apparent youth of a distinctive pattern of faint filaments near the remnant's center suggest a second supernova may have exploded within the original expanding shell of gas some 3,000 years later. P. Frank Winkler of Middlebury (Vt.) College and his colleagues provide evidence for that possibility in the Jan. 5 NATURE. Photographs taken through special filters at the Cerro Tololo Inter-American Observatory in Chile reveal three overlapping but separates sets of filaments, each with a characteristic chemical composition. One set (upper left) is dominated by nitrogen emissions, the second (upper right) by oxygen emissions and the third (lower left) by sulfur emissions. The fourth photograph (lower right) shows the region's appearance at a wavelength (6,100 angstroms) not dominated by emissions from specific elements.
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Publication:Science News
Date:Jan 7, 1989
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