Mathematics – Logic
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.354...43p&link_type=abstract
Nature (ISSN 0028-0836), vol. 354, Nov. 7, 1991, p. 43-46.
Mathematics
Logic
31
Astronomical Models, Binary Stars, Nebulae, Stellar Winds, Supernova 1987A, Asymptotic Giant Branch Stars, Companion Stars, Orbital Velocity, Stellar Rotation
Scientific paper
A simple geometrical model for the emission nebula around SN1987A, whose morphology has been likened to Napoleon's hat, is presented. The model consists of a ring and a truncated double cone. When the effects of light travel time are included, the model reproduces the important topological structures of the nebula and makes detailed quantitative predictions for its future appearance. In particular, the hat-shaped northern rim is simply explained as the interaction of the light front with the northern cone. To explain the origin of the double cone, it is argued that the progenitor of SN1987A was in a binary system: its strong wind, colliding with a weaker wind from the companion star, created an asymptotic shock surface that was spread out into the required geometry by the rotation of the binary.
Fabian Andrea C.
Podsiadlowski Ph
Stevens Ian R.
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