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Discovery of the remnant of S Andromedae (SN 1885) in M31
Fesen, Robert A.; Hamilton, Andrew J. S.; Saken, Jon M.
AA(Colorado, University, Boulder), AB(Colorado, University, Boulder), AC(Joint Institute for Laboratory Astrophysics, Boulder, CO)
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 341, June 15, 1989, p. L55-L57. (ApJL Homepage)
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NASA/STI Keywords:
Andromeda Galaxy, Galactic Bulge, Supernova Remnants, Absorption Spectra, Charge Coupled Devices, Optical Thickness, Photoionization, Stellar Spectra
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The long sought-after remnant of the celebrated 1885 supernova, commonly known as S Andromedae, which occurred in the nuclear bulge of M31, has been discovered. The detection in Fe I absorption suggests that: (1) the remnant contains appreciable iron-rich ejecta consistent with a type I supernova classification, (2) the ejecta are still mainly cold and freely expanding, (3) S And's Fe I absorption-line profiles must be quite broad, and (4) S And probably occurred on the side of M31's bulge nearer to us. Future absorption-line observations of S And have the potential of becoming among the most informative observations ever taken of a type I supernova.

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