NASA NTRS · 19790025961
Elemental abundances in a type I SNR
Abstract
The solid state spectrometer on the HEAO-2 X-ray observatory observed the X-ray spectrum of Tycho's SNR. The observations show a relative excess of line emission from Si, S, and Ar by or = 6 compared to that expected from a plasma of solar composition in collisional equilibrium and by a factor of or = 3 compared to Cas A. Similar excesses are not found for line emission from Mg and Fe. The data suggest that the SN observed by Tycho in 1572 produced significant amounts of Si group elements but did not eject large amounts of Fe as predicted by some models of Type I SN events.
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Becker, R. H., Holt, S., Smith, B. W., White, N., Boldt, E., Mushotzky, R., Serlemitsos, P.. 1979-09-01. Elemental abundances in a type I SNR. https://ntrs.nasa.gov/citations/19790025961
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