Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...336..429f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 336, Jan. 1, 1989, p. 429-441.
Astronomy and Astrophysics
Astrophysics
193
Emission Spectra, Iue, Line Spectra, Supernova 1987A, Ultraviolet Spectra, Interstellar Gas, Line Shape, Nuclear Fusion, Stellar Envelopes
Scientific paper
Results from UV observations of SN 1987A with the IUE satellite are presented, showing that emission lines of He II, C III, N III, N IV, N V, and O III increase in strength with time after May 24, 1987. It is found that increased emission originated in a photoionized low-density circumstellar gas, lost by the progenitor in its red supergiant phase. A nebular analysis reveals a large nitrogen overabundance, indicating that the gas has undergone substantial CNO processing. This suggests that the progenitor of SN 1987A lost much of its hydrogen envelope before the explosion. The findings are consistent with models in which a red supergiant evolves to the blue supergiant stage before exploding.
Cassatella Angelo
Fransson Claes
Gilmozzi Robert
Kirshner Robert P.
Panagia Nino
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