Computer Science
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6081s&link_type=abstract
HST Proposal ID #6081
Computer Science
Hst Proposal Id #6081 Hot Stars
Scientific paper
We intend to optain pilot observations of the symbiotic system RW Hya. If the expected features are found we will propose to cover a full orbital cycle of RW Hya. RW Hya is an eclipsing system that is characterized by line profile variations that repeat with orbital phase, in the absence of outbursts, and its brightness in the UV. The GHRS observations of a few selected lines will focus on weak low density intercombination lines that are suspected to be formed in a shock zone between the two stars, on broad line wings, and on P Cygni features thought to be due to a stellar wind from the hot object. These features are too weak to be accessible by IUE. Doppler tomography of the optically thin intercombination lines and eclipse observations of the wind features will allow to locate the formation region in the binary system. The results will be used for a quantitative comparison with sophisticated hydrodynamic calculations. Preliminary results of such calculations suggest that there are 3 emitting regions: the red giant's wind ionized by the hot object, a stellar wind from the hot object, and a wind-wind shock zone located between the stars. Observational constraints are desperately needed to validate our understanding of the hydrodynamics.
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