Illuminating a red supergiant wind around SN 1987A

Details Illuminating a red supergiant wind around SN 1987A Illuminating a red supergiant wind around SN 1987A

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342l..75c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 342, July 15, 1989, p. L75-L78.

Astronomy and Astrophysics

Astrophysics

38

Red Giant Stars, Stellar Winds, Supergiant Stars, Supernova 1987A, Brightness Distribution, Interstellar Matter, Light Scattering, Linear Polarization, Stellar Envelopes, Stellar Evolution

Scientific paper

A recently discovered light echo at a radius of about 9 arcsec from SN 1987A is interpreted as the result of a circumstellar shell at a radius of 4.5 pc from the SN. The shell may have its origin in the deceleration of the pre-SN red supergiant wind by the pressure of the surrounding medium. The required pressure is p/k = about 1000 per cu cm K. The echo is predicted to expand and contract over the next 30 yr with a declining surface brightness and a broadening of its width. Colors of the echo compared to those of the larger echoes may show differences in the wavelength dependence of scattering of the circumstellar grains compared to interstellar grains.

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