Supernova 1987 A - The nebular loops and 'Napoleon's Hat'

Details Supernova 1987 A - The nebular loops and 'Napoleon's Hat' Supernova 1987 A - The nebular loops and 'Napoleon's Hat'

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...262l...9w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 262, no. 1, p. L9-L12.

Astronomy and Astrophysics

Astrophysics

23

Nebulae, Stellar Envelopes, Stellar Structure, Supergiant Stars, Supernova Remnants, Supernova 1987A, Interstellar Matter, Red Giant Stars

Scientific paper

We discuss observations of the circumstellar environment of SN 1987A that were obtained between August 1989 and January 1992 at ESO's New Technology Telescope. We find that the angular dimensions of the two nebular loops (Wampler et al., 1990) have not changed during this period. Therefore these loops are confined to a small region. The expansion velocity of the loops is less than about 40 km/s if the loops expanded with a uniform velocity from a common origin. This structure and velocity is hard to reproduce with existing wind interaction models. Our observations further suggest that the Napoleon's Hat nebula does not originate from the general background LMC dust, but from a bow shock dust whose origins are closely related to the stellar winds from the progenitor star of SN 1987A.

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