5789(  0) - 07/18/95 17:59  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      5789
                                                       Version: **********
                                                       Check-in Date: **********

1.Proposal Title:
Archival Investigation of the Circumstellar Material Around SN 1987A
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2. Scientific Category   3. Proposal For  4. Cycle
Interstellar Medium         AR               5
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5. Investigators
                                                                                     Contact?
    PI: Arlin Crotts                      Columbia University
   CoI: Dr. Philip Plait                  University of Virginia                        N

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6. Abstract

We propose to use archived WFPC images of SN 1987A to investigate the structure and
time--dependent evolution of the three rings surrounding the supernova. New software
has recently become available to permit reduction and extensive analysis of the WFPC
images which was extremely difficult or impossible before. We plan to subtract a
Tiny--TIM generated PSF template from the images to remove the deleterious effects
of two nearby bright stars, which should reveal detail of the three rings that was
previously obscured. These new data can then be compared with the archived FOC data
(already reduced and analyzed by Plait as part of the Supernova INtensive Study),
and can also be compared to the post--refurbishment FOC and WFPC2 images, which are
expected to be made public shortly. Except for the few post--refurbishment images,
Plait is already in possession of all the images necessary, so no archive retrieval
is needed.
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  Observations Description
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  Real Time Justification
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  Calibration Justification
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  Additional Comments
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  Data Distribution

  Media:           8MM
  Blocking Factor: 10
  Ship To:         PI_Address
  Ship Via:        UPS
  Email:                                                              ,
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                                                5789(  0) - 07/18/95 17:59  - [  2]

            Summary Form for Proposal  5789

  Item                         Used in this proposal
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  Proposal Category            AR
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  Scientific Category          Interstellar Medium
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