Other
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84.1619h&link_type=abstract
Astronomical Journal, vol. 84, Oct. 1979, p. 1619-1631.
Other
30
Novae, Radio Emission, Radio Spectra, Stellar Envelopes, Stellar Radiation, Conservation Equations, Density Distribution, Gas Dynamics, Gas Pressure, Momentum Theory, Optical Thickness, Pressure Gradients, Radiant Flux Density, Radio Frequencies, Spherical Shells, Tables (Data)
Scientific paper
This paper presents data from multifrequency radio observations of the novae HR Del 1967 and FH Ser 1970 made from June 1970 to December 1978 and of V1500 Cyg 1975 made from September 1975 to December 1978. The data for FH Ser and V1500 Cyg constitute a complete history of the important phases of their radio 'light' curves, while all but the rising portion of the optically thick phase of an expanding nova shell is present for HR Del. A simple solution of the spherically symmetric equations of mass and momentum conservation for an isothermal gas, for which pressure gradients are effectively decoupled from the dynamics, is shown to fit the radio data for all three novae quite well. The main features of this model are strong density and velocity gradients that lead to long periods when the 'observable' shell evolves from an optically thick 'disk' to a completely optically thin shell.
Hjellming Robert M.
Newell R. T.
Vandenberg Nancy R.
Wade Campbell M.
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