Astronomy and Astrophysics – Astronomy
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.220p..27g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 220, May 15, 1986, p. 27P-31P.
Astronomy and Astrophysics
Astronomy
18
Infrared Astronomy, Peculiar Stars, Stellar Spectra, Supernovae, Visible Spectrum, Infrared Absorption, Silicon, Stellar Composition
Scientific paper
A small number of Type I supernovae exhibit well-defined peculiarities. In particular some Type I supernovae do not have the characteristic Si II 6150 Å feature, and some do not have the 1.2 μm absorption. It is noted that all supernovae which lack the infrared absorption also lack the 6150 Å feature. Therefore it is proposed that these supernovae constitute a single sub-class of Type I supernovae and that the absence of Si is responsible for the lack of both the 6150 Å and 1.2 μm absorptions. Si is an excellent candidate as the cause of the infrared absorption because Si I has a dense array of strong lines near 1.2 μm.
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