Cassiopeia A - an unseen supernova

Details Cassiopeia A - an unseen supernova Cassiopeia A - an unseen supernova

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976s%26t....51..236k&link_type=abstract

Sky and Telescope, vol. 51, Apr. 1976, p. 236-239.

Astronomy and Astrophysics

Astronomy

4

Astronomical Photography, Cassiopeia A, Radio Astronomy, Supernova Remnants, Argon, Color Photography, Hydrogen Clouds, Oxygen, Sulfur, Supernovae

Scientific paper

The article discusses measurements of the proper motions of all the knots and filaments of the supernova remnant observed around the position of the radio source Cassiopeia A. The measurements indicate that the supernova occurred around the year 1667 and that the 'stationary' filaments photographed in red light are actually expanding. Analysis of the spectra of the fast-moving knots photographed in blue-green light shows that argon, oxygen, and sulfur are overabundant relative to hydrogen by a factor of 40, giving observational proof that supernova explosions produce heavy elements. The distribution of oxygen and sulfur in the knots is taken as possible evidence of chemical stratification within the supernova that produced Cassiopeia A.

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