Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979azh....56..699b&link_type=abstract
Astronomicheskii Zhurnal, vol. 56, July-Aug. 1979, p. 699-705. In Russian.
Astronomy and Astrophysics
Astronomy
11
Astronomical Spectroscopy, Crab Nebula, Decametric Waves, Lunar Occultation, Brightness
Scientific paper
Results are presented for observations of a lunar occultation of the Crab Nebula at frequencies of 16.7, 20, and 25 MHz. The brightness distributions at these frequencies are obtained, and the coordinates of an observed bright feature with an angular diameter of less than 15 arcsec are shown to coincide with the position of the Crab pulsar (NP 0532) to within 0.17 + or - 0.25 sec in right ascension and -4 + or - 15 sec in declination. The contribution of the compact source to the total flux of the Crab Nebula is estimated to be approximately 48% at 16.7 MHz, 41% at 20 MHz, and 33% at 25 MHz. A spectrum of the bright feature in the range from 16.7 to 122 MHz is plotted, and a spectral index of 2.07 + or - 0.04 is determined. It is found that the spectrum in the decametric range is flatter for the nebula without the small-angular-diameter source.
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