Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5873v&link_type=abstract
HST Proposal ID #5873
Physics
Hst Proposal Id #5873 Hot Stars
Scientific paper
We propose to observe simultaneously the UV and X-ray spectral variabilites of Cyg X-2 with HST and ASCA. Previous simultaneous UV/X-ray observations using GINGA and IUE showed a unique relationship between the X-ray spectral states and the UV flux. IUE, however, is not able to measure the short timescales and kinematic velocities of interest in this system. We will use the GHRS G160M with time resolution of 0.5s in the vicinity of the NV and HeII lines. From delays between X-ray and UV line variations, we can analyze the radial structure of velocity in the disk. This will provide an unprecedented probe into the structure and dynamics of the accretion flow, enable us to test models of the UV emission, and constrain properties of the secondary star. We will also use the G140L with a time resolution of 50ms to search for the quasi-periodic oscillations so far seen only in the X-rays. Finding QPOs in the UV would be very important; since the X- ray flux can be easily modulated by geometric effects and emission in the visible can be confused with that of the non- collapsed secondary, the UV observations are most likely to yield direct evidence of the phenomenon related to the accretion disk.
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