Abstract
HUFFMAN1 has shown that absorption bands in the optical spectra of the supernova in NGC 4496 correlate well with dād bands of Fe3+ in yttrium iron garnet and Fe2+ in terrestrial almandine, Fe2+3 Al3+2Si3O12. I have suggested2 that the 4430 Ć band in supernova spectra is a result of Fe3+ in a silicate matrix, the band being reminiscent of that marking the 6A1(S)ā4A14E(G) transition in octahedral Fe3+ in andradite garnet, Ca2+3Fe3+2Si3O12. It is likely that interstellar garnets are silicate-based, and here I propose approximate formulae for these garnets based on the identification of two interstellar absorption bands, the energies of which can be related to garnet compositions.
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MANNING, P. Compositions of Garnets in Interstellar Dust. Nature 227, 1121ā1123 (1970). https://doi.org/10.1038/2271121a0
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DOI: https://doi.org/10.1038/2271121a0
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