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Cassiopeia A – the Youngest Known Galactic Supernova Remnant

Published online by Cambridge University Press:  07 February 2017

Sidney van den Bergh
Sidney van den Bergh*
Affiliation:
David Dunlap Observatory, University of Toronto, Richmond Hill, Ontario, Canada

Abstract

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Proper motion observations show that the explosion of the Cas A supernova took place in AD 1667 ± 8 (me). Individual moving knots have lifetimes ~ 10 yr. In these fast-moving knots oxygen and argon are overabundant by a factor of at least seventy with respect to hydrogen and nitrogen. Nitrogen is found to be overabundant in quasi-stationary flocculi. This suggests that these flocculi were formed from material that was ejected from the outer layers of the pre-supernova before its explosion in AD 1667.

Type
Session 4
Information
Symposium - International Astronomical Union , Volume 46: The Crab Nebula , 1971 , pp. 263 - 267
Copyright
Copyright © Reidel 1971 

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