The rate of decrease of the flux density of Cassiopeia A at 81.5 MHz

Details The rate of decrease of the flux density of Cassiopeia A at 81.5 MHz The rate of decrease of the flux density of Cassiopeia A at 81.5 MHz

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...255..285h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 255, no. 1-2, p. 285-287.

Astronomy and Astrophysics

Astronomy

15

Cassiopeia A, Flux Density, Stellar Evolution, Supernova Remnants, Errors, Least Squares Method, Radio Astronomy, Space Observations (From Earth)

Scientific paper

We have made a new measurement (epoch 1989.6) of the ratio of the flux density of Cassiopeia A (3C461) to that of Cygnus A (3C405) at 81.5 MHz. Our new value of 1.11 +/- 0.04, when combined with earlier measurements at this frequency, gives an overall rate of decrease of the flux density of Cassiopeia A equal to 0.92 +/- 0.16 percent per year. This is significantly lower than the previous value measured at 81.5 MHz by Scott et al. (1969), but is consistent with values at other frequencies. As a result, we now find no evidence for a dependence of the rate of decrease with frequency.

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