Nature Publishing Group, publisher of Nature, and other science journals and reference works
Nature
my account e-alerts subscribe register
   
Sunday 20 August 2017
Journal Home
Current Issue
AOP
Archive
Download PDF
References
Export citation
Export references
Send to a friend
More articles like this

Letters to Nature
Nature 218, 856 (01 June 1968); doi:10.1038/218856a0

Upper Limit to Radio Emission from Nova Delphini 1967

B. H. ANDREW & C. R. PURTON

Radio and Electrical Engineering Division, National Research Council, Ottawa.

A NOVA (Alcock's Nova) appeared in 1967 in the constellation Delphinus1 and had a maximum brightness of 4.6 magnitudes in mid-September2. An attempt to detect radio emission from the nova at a wavelength of 4.6 cm was made on September 4, 1967, when its visual magnitude was ~ 5.0. The observations were made with the 46 m radio telescope of the Algonquin Radio Observatory, and consisted of 100 scans across the position of the source (1950.0; α = 20h 40m 04s.2, δ = 18° 58′ 51″), resulting in a total integration time on the source of approximately 25 min. The measured flux density was 0.006 ± 0.012 flux units (1 flux unit = 10−26 W m−2 Hz−1), so the upper limit may be taken as 0.02 flux units. The confusion level, less than 0.011 flux units for this measurement (see preceding communication), was not large enough to affect seriously this upper limit.

  1. Mumford, G. S. , Sky and Telescope, 34, 82 (1967).
  2. Sky and Telescope, 34, 300 (1967).



© 1968 Nature Publishing Group
Privacy Policy