9525(  1) - 12/06/01 12:36  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      9525
                                                       Version: 1
                                                       Check-in Date: 06-Dec-2001
                                                                      11:44:59

1.Proposal Title:
Using the HST Archive to Compile a Comprehensive Inventory of LISM Structure and
Physical Properties
------------------------------------------------------------------------------------
2. Proposal For  3. Cycle
AR               11
------------------------------------------------------------------------------------
4. Investigators
                                                                                     Contact?
    PI: Jeffrey L. Linsky                 JILA, University of Colorado
   CoI: Mr. Seth Redfield                 JILA, University of Colorado                  N
   CoI: Dr. Brian Wood                    JILA, University of Colorado                  N
   CoI: Dr. Meena Sahu                    Goddard Space Flight Center                   N

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

Analysis of high resolution archive spectra for at least 24 lines of sight to stars
located within 100 pc, together with 41 lines of sight previously analyzed, will
allow us to develop a comprehensive model for the local ISM describing the structure
and physical properties of the important warm clouds. As Stage I of this program, we
have already analyzed the STIS E230H and GHRS Echelle-B spectra of the Mg II and Fe
II lines for these 24 lines of sight to determine the kinematics and morphological
structure of these clouds. The requested archive investigation is Stage II of our
program in which we will analyze the interstellar absorption lines of H I, D I, C
II, N I, O I, Mg I, Al II, Si II, and Mn II in high resolution spectra for these
lines of sight to determine the temperature, turbulent velocity, ionization,
chemical abundances, and depletions in these clouds. When available we will include
analyses of FUSE and optical spectra of additional ions for these same lines of
sight. Our objective is to determine the physical properties (and their spatial
variations) of the warm gas in these clouds for comparison with theoretical models
based on the radiation field in the LISM. This comprehensive study of the warm gas
in the LISM will become the guide for understanding physical processes in the ISM
elsewhere in the disk of the Galaxy. This work will be a major part of Seth
Redfield's PhD thesis.
------------------------------------------------------------------------------------
                                                9525(  1) - 12/06/01 12:36  - [  2]

            Summary Form for Proposal  9525

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