UV Imaging of S Andromedae {SN 1885} in M31

Details UV Imaging of S Andromedae {SN 1885} in M31 UV Imaging of S Andromedae {SN 1885} in M31

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6434h&link_type=abstract

HST Proposal ID #6434

Computer Science

Hst Proposal Id #6434 Interstellar Medium

Scientific paper

We propose WFPC2 UV imaging of the remnant of S Andromedae, the 1885 supernova which exploded in the bulge of M31. Optical HST images obtained by us early in Cycle 5 show the remnant as a 0''.6 diameter {= +/- 9,000 : km : s^-1} absorption spot silhouetted against the bulge of M31. Unexpectedly, the absorption appears to be mainly caused by Ca II LambdaLambda3934,3968 {H & K} and not by Fe I 3860 as earlier suspected. We propose WFPC2 F255W imaging to detect the expected 0.5-1 Msun of iron ejecta in the remnant through background light absorption by the Fe II resonance line complexes at 2350 and 2600 Angstrom. A detection in the UV would: {1} confirm the presence of iron in this suspected, albeit peculiar, Type Ia supernova, {2} determine the Fe II expansion velocity, and {3} provide valuable information on the mass of Fe II in this 110 year old remnant.

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