UV observations of three classical novae during early stages of decline

Astronomy and Astrophysics – Astronomy

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Novae, Stellar Spectra, Ultraviolet Astronomy, Abundance, Iue, Line Spectra

Scientific paper

UV spectra of the recent classical novae N Sgr 1982, N Ser 1983, and N Mus 1983 obtained with the IUE during the period October, 1982-March, 1983, corresponding to their early-decline, transitional, and nebular phases, respectively, are presented and analyzed. N Sgr 1982 is found to be a typical fast classical nova, and N Ser 1983 is characterized as a very fast nova having an asymmetric optically thin 10,000-km/sec wind with a large temperature gradient. It is proposed that a double-peak Mg II (280 nm) feature and high-ionization (C IV, N IV, Si IV) features formed in spatially separated parts of the wind. N Mus 1983 is classified as moderately fast by its spectral features but as slow photometrically; very strong N lines and moderately strong O and C lines indicate the importance of the CNO process in the thermonuclear runaway.

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