Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7393m&link_type=abstract
HST Proposal ID #7393
Computer Science
Hst Proposal Id #7393 Binary Stars
Scientific paper
Six X-ray novae {aka soft X-ray transients} provide the most clear-cut evidence presently available for the existence of black holes. We propose STIS spectral observations of the prototype object A0620-00 in its quiescent state. In Cycle 1, we observed A0620-00 with the FOS blue detector; however, the observations were very seriously compromised by the limited capability of the FOS combined with the unexpected faintess of the source. We now propose to revisit A0620-00 in the post- COSTAR era for two reasons: {1} to obtain a greatly improved UV spectrum using the STIS with its 2-D detectors, and {2} to test the new advection-dominated accretion flow {ADAF} model for accretion onto black holes. The result of fitting the ADAF model to the current broadband spectrum {optical to X- ray} of A0620-00 is important because it can be construed as a ``proof" that the compact object is a true black hole with an event horizon. At present the broadband spectrum of A0620-00 is admirably fitted by the ADAF model. However, the UV portion of the spectrum is very weakly constrained, and we propose to tighten the constraints substantially.
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