Understanding the Simplest Symbiotic System(s) II. The 1996 Eclipse of RW Hydrae

Details Understanding the Simplest Symbiotic System(s) II. The 1996 Eclipse of RW Hydrae Understanding the Simplest Symbiotic System(s) II. The 1996 Eclipse of RW Hydrae

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6550s&link_type=abstract

HST Proposal ID #6550

Computer Science

Hst Proposal Id #6550 Binaries And Star Fo

Scientific paper

We propose to observe the symbiotic system RW Hya duringeclipse. The observations will be compared to approved cycle 5HST observations at quadrature. The comparison will yield astringent test of our model for S-type symbiotic systems. Theproposed target, RW Hya, is a typical S-type system andcarefully selected for its characteristics: eclipsing, lineprofile variations that repeat with orbital phase, absence ofoutbursts, and UV bright. We postulate three differentemission regions: wind lines from the hot star, nebularemission from the wind of the red giant facing the hot star,and most interesting, features emerging from the wind-windinteraction zone. We predict a different eclipse behavior foreach of these regions. The GHRS observations are focused onweak low density intercombination lines that are suspected tobe formed in a shock zone between the two stars and on broadline wings and P Cygni features emergent from the stellar windof the hot object. These features are too weak to beaccessible by IUE. If our model is confirmed qualitatively bythe proposed test we will apply in a later HST cycle to covera full orbit. Doppler tomography of optically thinintercombination lines will allow to map the interaction zonein the binary system. The results will be used for aquantitative comparison with sophisticated hydrodynamiccalculations. Observational constraints are desperately neededto validate our understanding of the hydrodynamics.

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