5809(  0) - 07/18/95 18:03  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      5809
                                                       Version: **********
                                                       Check-in Date: **********

1.Proposal Title:
An HST Library of High Quality UV Spectra of Massive Stars
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2. Scientific Category   3. Proposal For  4. Cycle
Stellar Populations         AR               5
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5. Investigators
                                                                                     Contact?
    PI: Carmelle Robert                   Space Telescope Science Institute
   CoI: Claus Leitherer                   Space Telescope Science Institute             N
   CoI: Timothy M. Heckman                John Hopkins University                       N

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6. Abstract

We propose to build a high quality UV stellar library of hot, massive stars using
FOS and  GHRS spectra from the  HST archives. The high signal-to-noise ratio and
high spectral resolution achievable with the  FOS and  GHRS is a major factor in the
uniqueness of the library. Spectra of hot, massive stars observed in different
chemical environments also exist in the  HST archives which will allow the creation
of an extremely versatile library.  UV spectral libraries of hot stars represent a
fundamental tool for the study of the stellar population of star-forming regions.
Hot, massive stars, which are difficult to identify directly in the optical -IR part
of a composite spectrum, display on the other hand key signatures in the UV region.
For example, O and Wolf-Rayet stars have broad, metallicity dependent spectral
features of SiIV, CIV, and HeII due to their stellar winds. The study of stellar
populations based on UV spectral synthesis requires therefore a high quality
spectral library (S/N \buildrel > / ~ 30, resolution ~eq 200-300 km s^-1) of objects
covering a broad range of stellar properties. A spectral library of high quality
also represents a unique source of data for stellar atmosphere analysis.
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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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                                                5809(  0) - 07/18/95 18:03  - [  2]

  Data Distribution

  Media:           8MM
  Blocking Factor: 10
  Ship To:         PI_Address
  Ship Via:        UPS
  Email:                                                              ,
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                                                5809(  0) - 07/18/95 18:03  - [  3]

            Summary Form for Proposal  5809

  Item                         Used in this proposal
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  Proposal Category            AR
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  Scientific Category          Stellar Populations
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