Other
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.4701p&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #47.01; Bulletin of the American Astronomical Society, Vol. 30, p.1322
Other
1
Scientific paper
We present some recent HST/STIS observations of the Supernova 1987A system. Apart from providing information on the structure of the circumstellar rings and the expanding debris, these data also suggest that the long-awaited collision of the SN debris and the inner circumstellar ring has begun. Two interacting phenomena are observed. The interaction between the exploding debris with the H II region located inside of the inner ring results in the observed spatially extended high velocity (v ~ 15,000 km s(-1) ) radiation in Lyalpha and Hα . On the other hand, the interaction between the supernova debris with an inward protrusion of the inner ring results in the brightening of the ``hot spot,'' a highly localized and lower velocity shock (v la 350 km s(-1) ) which is rapidly increasing in brightness (factor of 2 in ~ 6 months). The SNR 1987A should increase in brightness many fold across the spectrum in the coming years. We also present the first ever NIR imaging of the SN 1987A debris and the circumstellar ring system. HST/NICMOS images in the He I 1.08mu m and and Paalpha are obtained. By comparing the He I 1.08mu m image with the He I lambda 5876 spectral image obtained by STIS, we are able to measure the temperature of the inner circumstellar ring and the ``hot spot.'' Moreover, the Paalpha image reveals the detailed structure of the supernova debris.
Gull Ted R.
Jason Pun Chun Shing
Lundqvist Peter
Maran Stephen P.
McCray Richard
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