Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...171..205m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 171, no. 1-2, Jan. 1987, p. 205-215.
Astronomy and Astrophysics
Astrophysics
70
Radio Spectra, Spectral Energy Distribution, Stellar Models, Stellar Structure, Supernova Remnants, Astronomical Maps, Binary Stars, Pulsars, Stellar Evolution
Scientific paper
The frequent occurrence of double loops in radio maps of supernova remnants suggests a model in which the shell emission is enhanced in two annular zones. This model also provides an alternative basis for interpretation for the commonly observed morphology in which a remnant is brighter on two opposing sides and weaker on the orthogonal sides. The biannular enhancement could have its origin in a biconical flow from the pre-supernova star, from the supernova itself, or from an associated pulsar or X-ray binary system and is probably formed early in the life of the remnant. It is further argued that, typically, pulsar-driven nebular components are relatively weak and that the presence of a pulsar within most known supernova remnants is not precluded. When account is taken of different viewing angles, different opening angles for the biconical flow, asymmetries in the surrounding interstellar medium and the possible presence of a pulsar-driven component, most observed supernova remnants can be accommodated within the model.
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