Other
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6420w&link_type=abstract
HST Proposal ID #6420
Other
Hst Proposal Id #6420 Binaries And Star Formation
Scientific paper
The close binary system V Sge is an extremely unusual object. It is thought to be related to cataclysmic variables or low mass X-ray binaries, though it is not clear if the compact accreting star is a white dwarf, neutron star or black hole. The light curve of V Sge shows deep primary and shallow secondary eclipses, while the optical spectra have shown that it is undergoing rapid mass loss in a wind. V Sge may represent a short--lived stage in the evolution of interacting binaries that has otherwise not been observed. It has faded significantly in the last 30 years. Optical spectroscopy and UV studies with IUE have led to contradictory conclusions for the model of the system. This problem is probably due to the low spectral resolution of the time-resolved IUE spectra. We will use the GHRS on HST to obtain high time-resolution, high spectral-resolution UV spectroscopy. With the G160M grating in WSCAN mode we will observe the the CIV 1549Angstrom doublet to investigate the mass loss and the HeII 1641Angstrom line to relate this to the behaviour of the underlying system. We will use the changes in the line profiles throughout the orbit and through the primary and secondary eclipses to determine the origin of the UV light and the structure of the system.
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