Ultraviolet Spectroscopy of the Black Hole A0620-00

Details Ultraviolet Spectroscopy of the Black Hole A0620-00 Ultraviolet Spectroscopy of the Black Hole A0620-00

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2334m&link_type=abstract

HST Proposal ID #2334

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Hst Proposal Id #2334

Scientific paper

There is compelling dynamical evidence that the X-ray nova A0620-00 contains a black hole. For more than ten years now, the nova has been in hibernation. It's quiescent optical spectrum is composed of two distinct components: a K5V stellar part and an accretion disk component. We propose to observe A0620-00 for a full binary orbit (7.8 hours) with the FOS. Two factors make the proposed UV observations a unique and exciting prospect: 1) the simplicity of the black hole event horizon eliminates the complex disk-star boundary layer in other accreting systems, and 2) the K5V secondary is completely invisible at UV wavelengths. Consequently, the UV spectrum of A0620-00 is expected to be the pure spectrum of an accreting black hole. We also propose to observe Cen X-4 (a quescent X-ray nova that contains a neutron star) in order to compare black-hole accretion and neutron-star accretion. This proposal is part of an 8 year, ongoing study of A0620-00.

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