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Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5360n&link_type=abstract
HST Proposal ID #5360
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Hst Proposal Id #5360 Interstellar Medium Novae
Scientific paper
We propose GHRS observations for studying mass loss of hot components in symbiotic novae and the close environment of the interacting binaries. We have indications that in some symbiotics the hot star loses mass by a fast wind. Mass loss by the cool giant has previously been investigated and is generally accepted. The detection of a second wind would imply that new physical processes need to be included in modelling symbiotic binaries, particularly the hydrodynamic treatment of the collision of two winds, with the related X-ray emission and other high energy phenomena. - It was recently suggested, that the interpretation of symbiotic spectra may be severely distorted by selective absorption by a forest of lines from neutral and lowly ionized atoms in the wind of the cool star. This `iron curtain' is mainly due to transitions from iron peak elements. Only HST has the required dynamic range and spectral resolution needed for a conclusive investigation of the wind and `iron curtain' problem. The present proposal addresses simultaneously three scientific goals: (1) A search for winds and mass losses from hot components in symbiotics stars. (2) Spectroscopic NLTE analyses of the wind features which will provide stellar parameters and wind characteristics of symbiotic novae. (3) An `iron curtain' analysis which allows an unambiguous interpretation of observed line profiles provides information about the physical state of the neutral and lowly ionized environment, in particular basic physical properties of the cool giant's wind.
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