Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217..781s&link_type=abstract
Astrophysical Journal, Part 1, vol. 217, Nov. 1, 1977, p. 781-787.
Astronomy and Astrophysics
Astrophysics
18
Novae, Radio Emission, Stellar Envelopes, Stellar Models, Distance, Infrared Spectra, Inhomogeneity, Light (Visible Radiation), Radiant Flux Density, Steady Flow, Velocity Measurement
Scientific paper
Thick expanding envelope models are examined to account for the radio-emitting properties of Nova Serpentis 1970 = FH Ser. All models are characterized by four parameters related to the density, inner and outer radii, and expansion velocity. Free-free emission from a fully ionized gas with an inverse-square density law in the shell is assumed. It is concluded that all of the radio data are best represented by a shell that is expanding at a constant rate, with the outward speed proportional to the radial coordinate in the shell ('Hubble flow model'). The radio data do not permit discrimination between spherically symmetric shells and the polar-cap shell discussed by Hutchings (1972). The best-fit model is used to estimate the distance, mass, and kinetic energy of the expanding nova envelope.
Palimaka J. J.
Seaquist Ernest R.
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