8356(  2) - 12/18/98 16:44  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      8356
                                                       Version: 2
                                                       Check-in Date: 18-Dec-1998
                                                                      16:42:48

1.Proposal Title:
Further Insights into Interstellar Dust Grains Using Ultraviolet Polarimetry and
Spectroscopy
------------------------------------------------------------------------------------
2. Proposal For  3. Cycle
AR               8
------------------------------------------------------------------------------------
4. Investigators
                                                                                     Contact?
    PI: Michael J. Wolff                  Space Science Institute
   CoI: Prof. Ulysses J. Sofia            Whitman College                               N
   CoI: Prof. Geoffrey C. Clayton         Louisiana State University                    N

------------------------------------------------------------------------------------
5. Abstract

Understanding interstellar dust and its role in the universe is very important.
Virtually all observations of astrophysical objects and their physical processes are
affected by the presence of dust either within the system being studied or along its
line of sight. We propose a research program that will appreciably enhance our
knowledge of dust properties. The 11 Faint Object Spectrograph datasets identified
in the proposal represent a significant fraction of all available ultraviolet
interstellar polarimetry. These data will be used to probe the connection of the
grain size distribution with sightline environment by employing such powerful
techniques as the maximum entropy method. We also propose an analysis of the Goddard
High Resolution Spectrograph data for HD 147933, one of only two objects with an
observed polarized 0.218 micron\ extinction feature. This aspect of our program will
derive gas phase abundances for several elements in an effort to provide further
insight into the unique nature of this sightline.
------------------------------------------------------------------------------------
  Data Distribution

  Paper Products:  NO
  Media:           ELECTRONIC
  Blocking Factor: 10
  Ship To:         PI_Address
  Ship Via:
  Email:
------------------------------------------------------------------------------------

                                                8356(  2) - 12/18/98 16:44  - [  2]

            Summary Form for Proposal  8356

  Item                         Used in this proposal
------------------------------------------------------------------------------------------------------------------------------------
  Proposal Category            AR
------------------------------------------------------------------------------------------------------------------------------------