Physics – Optics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...246l..69w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 246, no. 2, June 1991, p. L69-L72.
Physics
Optics
30
Astronomical Spectroscopy, Emission Spectra, Forbidden Transitions, Nebulae, Stellar Envelopes, Supernova Remnants, Supernova 1987A, Cassegrain Optics, Electron Density (Concentration), Electron Energy, Helium, Spectral Line Width, Supernovae
Scientific paper
Results are presented of Cassegrain Echelle Spectrograph observations of the circumstellar emission of SN1987A that were made at the end of August 1990. It is found that the temperature of the nebula was still as high as 20,000 K 1280 days after the supernova explosion. However, the forbidden lines now give electron density that is significantly lower than before. Many new narrow emission lines can now be seen, including various forbidden lines arising from collisionally ionized iron. It is argued that additional energy sources are required to keep the nebula in the observed temperature and ionization stage. One significant contribution of the energy sources might come from shock interactions of the ejecta with the surrounding circumstellar material.
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