Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....76..226w&link_type=abstract
Astronomy and Astrophysics, vol. 76, no. 2, July 1979, p. 226-229.
Astronomy and Astrophysics
Astronomy
2
Energy Distribution, Infrared Astronomy, Novae, Stellar Radiation, Astronomical Models, Bremsstrahlung, Energy Spectra, Light Curve, Optical Thickness, Radiative Transfer, Stellar Evolution
Scientific paper
Infrared observations of the early stage Nova Cygni 1975 are presented. The results show that at the longer wavelengths the maximum is reached considerably later than in the visual. A model for the continuum radiation is proposed that explains the complete radiative evolution of this nova in terms of thermal bremsstrahlung. The change of the optical thickness in a plasma shell and the wavelength dependence of the optical thickness under expansion gives good agreement with the observed times of maximum brightness. The time of onset of radiative energy loss from the nova is determined to be 29.9 August 1975, at which time the nova must have been at maximum in the Lyman limit at 912 A. This time does not have to coincide with the time at which the nova shell is generated. The development of the emission system in H-beta is expected to precede that of H-alpha.
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