Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...430..264l&link_type=abstract
The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 430, no. 1, p. 264-276
Astronomy and Astrophysics
Astrophysics
50
Emission Spectra, Interstellar Matter, Shock Wave Interaction, Shock Waves, Stellar Envelopes, Stellar Luminosity, Stellar Spectra, Supernova 1987A, Brightness, H Alpha Line, H Beta Line
Scientific paper
The envleope of SN 1987A will strike its circumstellar ring in 12 +/- 3 yr after explosion (A.D. 1999+/-3), the exact time depending weakly on the uncertain density of diffuse gas between the supernova and the ring. The impact will drive a radiative shock into the ring with velocity approximatley 200-400 km s-1. The shocked ring will become a bright optical and ultraviolet emsiison-line source. A bright arc will suddenly appear at the near side of the ring and grow into an entire ring about 11 months later. The luminosities of the brightest lines, H-alpha H-alpha, N v lambda lambda 1238, 1242, and O VI lambda lambda 1032, 1038 will rise rapidly to approxminately 1036-1037 ergs s-1 and remain bright for several years after impact. The emission lines from the shocked ring will have FWHM approximatley 300-600 km s-1 and complex profiles that will depend on position and will be sensitive to the details of the density distribution of gas in the ring. Strong EUV radiation from the shock will photoionize the unshocked ring, causing emission of narrow FWHM equivalent to 15 km s-1 H-alpha, H-beta and (O III) lambda lambda 4959, 5007 lines with luminosities approximatley 1035 ergs s-1.The EUV radiation will probably cause the nebulosity beyond the ring to become visable again. The EUV radiation may also illuminate the unshocked outer supernova envelope, causing visible emission of broad FWHM equivalent to 104 km s-1 H-alpha and H-beta lines.
Luo Ding
McCray Richard
Slavin Johnathan
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