Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...212..198j&link_type=abstract
Astrophysical Journal, Part 1, vol. 212, Feb. 15, 1977, p. 198-202.
Astronomy and Astrophysics
Astrophysics
6
Novae, Oao 3, Stellar Spectrophotometry, Ultraviolet Spectra, Astrophysics, Satellite Observation, Stellar Envelopes
Scientific paper
Near-ultraviolet radiation from Nova Cygni 1975 was detected by the Copernicus satellite on five occasions from 1975 September 1 to 1975 September 9. The nova was not seen in the UV after this date. The principal result was the observation of a broad emission feature from the Mg II doublet at 2800 A. The absence of strong UV radiation at shorter wavelengths suggests that these lines are produced by collisional excitation in the outer layers of an expanding shell with electron temperature of approximately 4000 K. The absence of observed emission lines from highly ionized species indicates that the amount of material with log T between 4.4 and 5.7 is less than 0.001 times that which produces the Mg II emission. The continuum flux in the near-UV decreased as the nova evolved, showing that the total luminosity decreased as the nova faded in the visible.
Anderson Rachel
Friedjung Michael
Gallagher Jay S.
Henry Richard C.
Jenkins Edward B.
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