Other
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6889r&link_type=abstract
HST Proposal ID #6889
Other
Hst Proposal Id #6889 Binaries And Star Fo
Scientific paper
A short, exploratory HST observation of the AM~Her binary, QS Tel, in1994 aimed to isolate and quantify the contribution of the accretionregion in the UV band. When proposed, QS~Tel was only known to activelyaccrete at one pole. The subsequent discovery of a two pole accretionmode in our EUV observations and our lack of knowledge of the accretionmode at the time of the HST observation (only securely established viaEUV or X-ray data) severely hampers interpretation of the HST data. Ourprevious work suggests that QS Tel undergoes relatively frequent anddramatic changes of its accretion geometry in comparison to other AM Herstars, offering an excellent opportunity to pin down the causes of suchalterations. Here we primarily seek to obtain coordinated EUV and HSTcoverage of QS Tel to remove the existing ambiguities and preciselyrelate the UV and EUV emission. At the same time we will quantify the EUVand UV spectral properties of a dip, discovered in the EUV band and(apparently) observed once by HST. This dip probably arises fromoccultation of the accretion site by the material flowing onto it.Quasi-simultaneous EUV and UV information will help us to more securelyestablish the absorption mechanism responsible for the dip.
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