Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248..465s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Feb. 1, 1991, p. 465-478.
Astronomy and Astrophysics
Astronomy
26
Astronomical Spectroscopy, Faint Objects, Supernova 1987A, Visible Spectrum, Abundance, Line Spectra, Spectrographs, Spectrum Analysis
Scientific paper
Optical spectra of supernova 1987 A, taken during the first 3 yr after the explosion, are presented. The spectra cover the 5500-10200-A spectral range with 20-A spectral resolution. The spectrophotometric accuracy of the data is approximately 10 percent. Identifications are proposed for most of the prominent features in the spectra, and their evolution is discussed. Transitions of H I, He I, C I, O I, Na I, Ca II, and the iron group elements are found. Some identifications are proposed here for the first time. Of particular interest is the absence of the fluoresced 8446-A line of neutral oxygen despite the presence at the same time of the 11287-A line in the same fluorescence cascade. It is shown that this can be explained by the large optical depth in the line. The Forbidden C I 9830-A line is found to be unusually narrow, suggesting little mixing of the carbon-rich region of the progenitor.
Cannon Russell D.
Couch Warrick J.
Dopita Mike A.
Spyromilio Jason
Stathakis Raylee A.
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