8359(  2) - 12/18/98 16:46  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      8359
                                                       Version: 2
                                                       Check-in Date: 18-Dec-1998
                                                                      16:44:28

1.Proposal Title:
The Spatial Location of the Flaring Regions on AB Doradus
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2. Proposal For  3. Cycle
AR               8
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4. Investigators
                                                                                     Contact?
    PI: Frederick Walter                  State University of New York
   CoI: Mr. William Sherry                State University of New York                  N
   CoI: Prof. Andrew Collier-Cameron      University of St. Andrews                     N

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5. Abstract

We request support to analyze 5 hours of GHRS spectra (600 individual spectra) of
the C IV lines of the active K dwarf AB Doradus. These data (program 5310) were
obtained immediately prior to our 14 hour GTO campaign (program 5181) on this star
on 14 November 1994. AB Dor is the prototypical young, active star. Its atmosphere
shows indications of domination by a large-scale global magnetic field. We propose
to analyze this data set in conjunction with our GTO data and simultaneous
photospheric doppler imaging, using tomographic techniques to identify the locations
of the flaring regions, and to correlate them with the dark regions identified from
optical spectroscopy and photometry. These data bear on the question of whether the
large dark regions in active stars are solar- like magnetically-dominated spots, or
are regions more like solar polar coronal holes. This investigation may lead to a
better understanding of the nature of the stellar magnetic activity in the most
active stars.
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  Data Distribution

  Paper Products:  NO
  Media:           ELECTRONIC
  Blocking Factor: 10
  Ship To:         PI_Address
  Ship Via:
  Email:
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                                                8359(  2) - 12/18/98 16:46  - [  2]

            Summary Form for Proposal  8359

  Item                         Used in this proposal
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  Proposal Category            AR
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