Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7299b&link_type=abstract
HST Proposal ID #7299
Physics
Hst Proposal Id #7299 Interstellar Matter
Scientific paper
We request STIS E140M echelle spectra for four probes of the X-ray bright superbubble N 51 D in the LMC. We further request WFPC2 images of the H Alpha and S II emission in this region to be taken in parallel with the STIS spectra. The combination of absorption and emission information will allow a study of the transition between hot {10^6 K} shocked gas and warm {10^4 K} gas in the interface of a superbubble around an OB association. Such a study can best be done for a superbubble in the LMC because this minimizes the confusion with intervening interstellar absorption. N51D provide a well- defined closed environment with known distance, size, and kinetic energy. The 10 km/s resolution of the spectra will resolve the N V, C IV and Si IV lines, which we will use as a thermometer. Further, by studying lines of different ionization stages we can determine the ionization structure of the shell as well as study the reaction of dust to the harsh conditions inside the shell. Combined with our supporting X- ray, radio and optical data the STIS observations will enable us to determine the density, pressure and ionization of the different gas phases in N51D. The parallel WFPC2 HAlpha and SII images will trace the impact of supernova shocks on the shell.
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