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Date and Time of the Query: 2019-08-25 T11:16:28 PDT
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For refcode 1989A&A...210L...1C:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1989A&A...210L...1C Infrared emission from the sub-arcsecond vicinity of SN 1987 A A.A. Chalabaev, C. Perrier, and J.-M. Mariotti CNRS, Observatoire de Haute Provence, F-04870 St. Michel-l'Observatoire, France Observatoire de Lyon, F-69561 St. Genis-Laval Cedex, France Received July 21, accepted August 29, 1988 Summary, We present the results of speckle-interferometry of SN 1987a in the {lambda}{lambda} 2-5 micron spectral range, carried out in May, June and August 1987 at the 3.6m telescope at ESO. The observations revealed the presence of a faint emission in the vicinity of the SN on June 17-22 in the L' band and on August 5-6 in the K, L' and M bands. An IR light echo from dust clumps appears as the most plausible explanation of the IR speckle sources. According to current models of the progenitor evolution, the dust clumps could be present as the remnants of the "antique" red supergiant wind material. Within this framework, we deduce, from the distance of the mid-June IR speckle sources to the SN, that the red supergiant wind had ceased to blow not later than 4600-5100 yr ago, assuming that the remnant dust flows out at the velocity of 10 km s^-1^. The colour temperature of the speckle emission constraints the luminosity of the radiation flash at shock breakout to have been 7x10^42^ erg s^-1^ < L_b_ < 3x10^43^ erg s^-1^, assuming typical spectral properties of dust. Key words: supernovae and supernova remnants : SN 1987a - infrared radiation - interferometry
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