Velocity structure of the ring nebula around supernova 1987A

Details Velocity structure of the ring nebula around supernova 1987A Velocity structure of the ring nebula around supernova 1987A

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.350..683c&link_type=abstract

Nature (ISSN 0028-0836), vol. 350, April 25, 1991, p. 683-685. NASA-supported research.

Physics

80

H Alpha Line, Nebulae, Stellar Envelopes, Stellar Winds, Supernova 1987A, Emission Spectra, Iue, Line Spectra, Optical Properties

Scientific paper

A series of high-resolution spectra of the pc-sized nebula around SN1987A are presented. The hollow, 1.7 arcsec-wide nebula has the velocity field of a ring expanding at 10.3 km/s, not that of a limb-brightened spheroid. Fainter nebulosity within 3 arcsec is expanding slightly faster, as indicated by redshifted emission from behind the SN. The geometry of the emission can be used to infer structure, provided that light travel time and recombination delays are accounted for. The analysis sets an upper limit to the velocity of the wind from the progenitor during its red supergiant (RGS) phase, and implies an RSG lifetime of less than 400,000 yr and an interval of about 20,000 yr between the end of the RSG phase and the SN explosion.

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