AAS Meeting #193 - Austin, Texas, January 1999
Session 47. Supernovae
Display, Thursday, January 7, 1999, 9:20am-6:30pm, Exhibit Hall 1

## [47.01] Some Recent HST Observations of SN~1987A and SNR~1987A

C.S.J. Pun (NASA/GSFC), S. Poirier (U. Toronto), G. Sonneborn, S.P. Maran, T. R. Gull (NASA/GSFC), R. McCray, E. Michael (U. Colorado), P. Lundqvist (Stockholm Obs.)

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 Ly\alpha and H\alpha. 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 1.08\mum and and Pa\alpha are obtained. By comparing the He~I 1.08\mum image with the He~I \lambda5876 spectral image obtained by STIS, we are able to measure the temperature of the inner circumstellar ring and the hot spot.'' Moreover, the Pa\alpha image reveals the detailed structure of the supernova debris.