Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mmsai..52...87p&link_type=abstract
(Consiglio Nazionale delle Ricerche, Meeting, Rome, Italy, May 30, 31, 1980.) Società Astronomica Italiana, Memorie, vol. 52, Ma
Astronomy and Astrophysics
Astronomy
Red Giant Stars, Spiral Galaxies, Stellar Envelopes, Stellar Winds, Supernovae, Ultraviolet Spectra, Absorption Spectra, Abundance, Emission Spectra, H Ii Regions, Line Spectra
Scientific paper
Results are presented for IUE observations, in the spectral region from about 1200 to 3200 A, of the Type II supernova 1979c, which occurred near an H II region in a main arm of the spiral galaxy NGC 4321. It is shown that the bulk of the energy is radiated by the main supernova shell as continuous emission running smoothly from 1600 to 3200 A, corresponding to a color temperature of about 11,000 K. The numerous absorption features superimposed on the continuum are attributed to absorption in the disks and haloes of the Galaxy and NGC 4321. Analysis of the observed UV emission lines indicates that the shell emitting most of the high-excitation UV lines is physically distinct from the supernova photosphere, that the UV shell is likely to consist of preexisting circumstellar material with anomalous abundances that was ejected as a more or less continuous stellar wind by the red supergiant progenitor, and that the wind material was subsequently compressed and accelerated as a result of the supernova explosion, possibly by the radiation pressure of an initial soft X-ray burst.
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