Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...132....1f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 132, no. 1, March 1984, p. 1-10.
Astronomy and Astrophysics
Astronomy
36
Emission Spectra, Interstellar Extinction, Stellar Envelopes, Stellar Spectra, Supernovae, Ultraviolet Astronomy, Abundance, Photoionization, Radial Velocity, Red Giant Stars, Supergiant Stars, Ultraviolet Spectra
Scientific paper
Ultraviolet observations of SN 1979c are used to derive the physical conditions in the line-forming regions. The emission lines have asymmetric profiles and large expansion velocities and are therefore formed in a narrow shell close to the photosphere having a constant velocity. The most likely mechanism for the excitation of these lines is photoionization of the gas by energetic radiation from the supernova shock wave. Abundance ratios of N/C = 8 and O/C less than 4 are derived from the intensities of the UV lines. It is concluded that the presupernova star was a supergiant which had undergone a long period of mass loss, thereby revealing CNO-processed material. Finally, evidence is found for a narrow, transient feature in the semiforbidden N III 1750 line, which is likely to arise in the circumstellar gas around the supernova.
Benvenuti Piero
Fransson Claes
Gordon Christopher
Hempe K.
Palumbo Giorgio G. C.
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