7525(  1) - 12/14/96 00:26  - [  0]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      7525
                                                       Version: 1
                                                       Check-in Date: 13-Dec-1996
                                                                      18:15:07

1.Proposal Title:
Improved Emission Line Diagnostics of Symbiotic Stars
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2. Scientific Category   3. Proposal For  4. Cycle
BINARY STARS                AR               7
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5. Investigators
                                                                                     Contact?
    PI: Brian Espey                       The Johns Hopkins University
   CoI: Prof. Francis Keenan              Queen's University, Belfast                   N
   CoI: Fiona McKenna                     Queen's University, Belfast                   N

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6. Abstract

Symbiotic stars provide an important laboratory for the study of the structure and
photoionization processes in red giant winds. RR-TEL is one of the brightest and the
best studied of these systems and has provided a testing ground for both ideas of
symbiotics, and also for emission line physics and atomic data. We propose to study
the emission line gas of RR-TEL by using archival spectra taken with the HRS in
conjunction with existing far-UV (FUV) obtained with the Orfeus and Astro-2 space
missions. Our goal is to develop line diagnostics, and to apply them to the study of
RR-TEL. Observation of the UV emission lines at high resolution with the HRS
provides a means to separate out the properties of the nebular gas surrounding the
system, and emission features attributable to the shocked region where the winds
from the hot and cool stars interact. These provide a point of comparison with X-ray
determinations of the shock strength and also with theoretical models. HRS data
taken to date has shown the power of high resolution studies in deciphering the
multiple component nature of the emission line regions. The diagnostics we develop
in this work can also be applied to future STIS observations.
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  Data Distribution

  Media:           ELECTRONIC
  Blocking Factor: 10
  Ship To:         PI_Address
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  Email:                                                              ,
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                                                7525(  1) - 12/14/96 00:26  - [  1]

            Summary Form for Proposal  7525

  Item                         Used in this proposal
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  Proposal Category            AR
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  Scientific Category          BINARY STARS
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