Periodic variations of radio emission and the spectral evolution of the supernova remnant Cassiopeia A

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cassiopeia A, Periodic Variations, Radio Emission, Stellar Spectra, Supernova Remnants, Emission Spectra, Radiant Flux Density

Scientific paper

The paper presents the results of absolute measurements of the fluxes and spectra of the supernova remnant Cassiopeia A which were obtained during 1971-1985 using the 'artificial moon' method. An analysis of the limiting accuracy of the absolute measurements is presented. New data are obtained on the decrease in the spectral index and the frequency dependence of the flux drop rate and their variations with time. Questions concerning the evolution of the source's radio emission are addressed.

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