Light curve and spectral evolution of Nova Aquilae 1982

Astronomy and Astrophysics – Astronomy

Scientific paper

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Light Curve, Novae, Stellar Evolution, Stellar Spectra, Emission Spectra, Line Spectra, Photographic Plates, Stellar Magnitude, Temporal Distribution

Scientific paper

Results of optical observations of Nova Aquilae 1982 carried out at Asiago from February to November 1982 are presented. The observations indicate that Nova Aql 1982 is a rather exceptional nova: some of its distinctive properties, such as the large amplitude, the steep decline, the rapid brightness fluctuations, the extremely high degree of excitation, the coomplex structure of the emission lines, and the marginal appearance of coronal lines, are shared by fast novae which are considered anomalous; the most closely comparable star to Nova Aql 1982 is concluded to be V630 Sgr. In an interpretation of the spectra, it was assumed that there were at least two expanding gaseous envelopes around the nova. Under this assumption the strong central cores of the emission bands come from an envelope of relatively high density, possible existing before the outburst, pushed out with a moderate velocity (some hundred km/s) by the nova explosion; whereas the diffuse emissions come from envelopes of low density ejected at very high speed (thousands of km/s) during the outburst.

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