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!  | PED OUTPUT PRODUCT |
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!
!  /spectre/data1/aroman/proposals/6492.prop
!  Generated by PREPROCESSOR, version 6.3g
!  Date: Mon Jul 29 14:19:53 EDT 1996

Proposal_Information
              Title: High Resolution Imaging of the Massive Overcontact Binary RY Scuti
  Proposal_Category: GO
Scientific_Category: BINARIES AND STAR FORMATION
              Cycle: 6


Investigators

            PI_Name: Robert Gehrz
     PI_Institution: University of Minnesota


           CoI_Name: Terry Jones
    CoI_Institution: University of Minnesota
            Contact: Y

           CoI_Name: Roberta Humphreys
    CoI_Institution: University of Minnesota
            Contact: 

           CoI_Name: Kris Davidson
    CoI_Institution: University of Minnesota
            Contact: 

           CoI_Name: Joachim Krautter
    CoI_Institution: University of Heidelberg
            Contact: 


Abstract:
RY Scuti is a post-main sequence, eclipsing, 'overcontact'
binary. The two components are very massive, 49 and 39 M_\odot
, with a combined luminosity in excess of 3* 10^6L_\odot .
Ground based observations have established that this star is
surrounded with a very unusual nebula about 1 arcsecond in
extent containing both ionized gas and thermally emitting
dust. The Ne abundance in the nebula is well above solar
composition, indicating the system is at a critical phase of
its evolution. We propose to image the nebulosity around RY
Scuti to investigate its morphology and the mass loss process
in the system. We will use these images to distinguish between
hypothesized mass loss scenarios and to study the interface
between the plasma and dust regions of the nebula.


Questions


    Observing_Description:
RY Scuti is a relatively bright object (V = 9.1, B = 10.1)
surrounded by faint nebulosity. We have planned a series of
exposures in V (F547M), B (F467M) and HAlpha  (F656N) with
the shortest chosen to avoid bleeding from the central star
and the longest to image the fainter outer parts of the
nebula. The exposure times are: 0.5s, 3s, 20s, 60s in V; 10s,
50s, 250s in B; 15s, 75s, 400s in HAlpha . With standard
allowances for acquisition and overhead time this fills one
orbit. begintabularlll Cycle 6  & Primary Orbits:1  &
Exposures:10, endtabular

  Real_Time_Justification:
None.
R. D. Gehrz and J. Krautter will be obtaining supporting
ground-based near-IR imaging observations using IRAC-2 on the
2.3-m telescope and mid-IR imaging observations using the
TIMMI camera on the 3.6-m telescope at ESO.

Calibration_Justification:


      Additional_Comments:



Fixed_Targets

  Target_Number: 100
    Target_Name: HD169515
Alternate_Names: RYScuti
    Description: STAR,SUPERGIANT O,INTERACTING BINARY
       Position: RA=18H 22M 42.706S +/- 0.0011S,DEC=-12D 43' 9.24" +/- 0.005"
        Equinox: 1950
        RV_or_Z: 
          RA_PM: 
         Dec_PM: 
          Epoch: 
Annual_Parallax: 
           Flux: 
                V = 9.1+/-0.1
                B-V = 1.06+/-0.05
                E(B-V) = 1.37+/-0.1
       Comments: 


Solar_System_Targets


Generic_Targets


Scan_Data


Visits

      Visit_Number: 01
Visit_Requirements: 
  On_Hold_Comments: 
    Visit_Comments: 

     Exposure_Number: 101
         Target_Name: HD169515
              Config: WFPC2
              Opmode: IMAGE
            Aperture: PC1
          Sp_Element: F467M
          Wavelength: 
 Optional_Parameters: ATD-GAIN=15
Number_of_Iterations: 1
   Time_Per_Exposure: 2 S
Special_Requirements: 
                SEQ 101-303 NON-INT
            Comments: 

     Exposure_Number: 102
         Target_Name: HD169515
              Config: WFPC2
              Opmode: IMAGE
            Aperture: PC1
          Sp_Element: F467M
          Wavelength: 
 Optional_Parameters: DITHER-TYPE=LINE,DITHER-LINE-SPACING=0.161
Number_of_Iterations: 2
   Time_Per_Exposure: 100 S
Special_Requirements: 
            Comments: 

     Exposure_Number: 301
         Target_Name: HD169515
              Config: WFPC2
              Opmode: IMAGE
            Aperture: PC1
          Sp_Element: F656N
          Wavelength: 
 Optional_Parameters: ATD-GAIN=15
Number_of_Iterations: 1
   Time_Per_Exposure: 5 S
Special_Requirements: 
            Comments: 

     Exposure_Number: 302
         Target_Name: HD169515
              Config: WFPC2
              Opmode: IMAGE
            Aperture: PC1
          Sp_Element: F656N
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 2
   Time_Per_Exposure: 20 S
Special_Requirements: 
            Comments: 

     Exposure_Number: 303
         Target_Name: HD169515
              Config: WFPC2
              Opmode: IMAGE
            Aperture: PC1
          Sp_Element: F656N
          Wavelength: 
 Optional_Parameters: DITHER-TYPE=LINE,DITHER-LINE-SPACING=0.161
Number_of_Iterations: 1
   Time_Per_Exposure: 120 S
Special_Requirements: 
            Comments: 

Data_Distribution         ! Defaults indicated; change if desired

         Medium: 8MM
Blocking_Factor: 10
        Ship_To: PI_Address
       Ship_Via: UPS
Recipient_Email: 

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