! Proposal 5885, submission 2
! PI: Alain Lecavelier Des Etangs
! Received Wed Mar 15 11:21:38 EST 1995
! From: lecaveli@iap.fr
! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template
! $Id: 5885,v 4.1 1995/09/22 15:28:55 pepsa Exp $
! 7 phase2p@stsci.edu  Fri Mar 17 02:01  739/26368 Proposal 5891, submission
   
!   Refer to the HST Phase II Proposal Instructions to fill this out
!
!   Anything after a "!" is ignored, and may be deleted
!
!   All keywords with multiple entries are comma delimited except the
!   Visit_Requirements and Special_Requirements keywords which can be
!   delimited with carriage returns or semi-colons, but not commas
!
! For help call your Program Coordinator: Alice Berman
!             Phone: 410 338-4462    , E-mail: aberman@stsci.edu
!
! This partially completed template was generated from a Phase I proposal.
!

Proposal_Information                           ! Section 4
              Title:  GHRS-Observations of candidate Beta
                      Pictoris-like circumstellar gaseous disk
  Proposal_Category:  GO
Scientific_Category:  Interstellar Medium
             Cycle:    5

Investigators
     PI_name:         Alain Lecavelier Des Etangs
     PI_Institution:  Institut d'Astrophysique de Paris

          CoI_Name:   A. Vidal-Madjar
   CoI_Institution:   Institut d'Astrophysique de Paris
           Contact:             ! Y or N (designate at most one contact)

          CoI_Name:   R. Ferlet
   CoI_Institution:   Institut d'Astrophysique de Paris
           Contact:             ! Y or N (designate at most one contact)

          CoI_Name:   A. Lagrange-Henri
   CoI_Institution:   Observatoire de Grenoble
           Contact:             ! Y or N (designate at most one contact)

          CoI_Name:   H. Beust
   CoI_Institution:   Observatoire de Grenoble
           Contact:             ! Y or N (designate at most one contact)

          CoI_Name:   D. Mouillet
   CoI_Institution:   Observatoire de Grenoble
           Contact:             ! Y or N (designate at most one contact)

          CoI_Name:   M. Deleuil
   CoI_Institution:   Laboratoire d'Astrophysique de Marseille
           Contact:             ! Y or N (designate at most one contact)

          CoI_Name:   J Lissauer
   CoI_Institution:   State University of New-York
           Contact:             ! Y or N (designate at most one contact)

          CoI_Name:   D Backman
   CoI_Institution:   NASA Ames Research Center
           Contact:             ! Y or N (designate at most one contact)


Abstract:                                ! Free format text (please update)
    The gaseous parts of dust disks surrounding main sequence
    stars have been the subject of intense investigations since
    1985. The spectral signatures of Beta Pictoris led to the
    explanation that the gas content whose origin was a puzzle in
    such an evolved disk is produced by the evaporation of many
    small bodies.         
    A way to progress in that field is to
    search for gas signatures in the environment of other stars
    presenting known IR excesses or shell characteristics. This
    study was started from the ground and should be continued now
    in the UV where stronger lines are available. From ground-
    based observations, we have shown that four stars present weak
    circumstellar gas signatures (Lagrange-Henri et al 1990). More
    recently, two additionnal candidates were discovered in an
    optical survey of the local interstellar medium. But from the
    ground, it is clear that having access to essentially only the
    CaII lines is a strong limitation. The UV observation of these
    lines of sight will give us a detailed view of the
    circumstellar material. The inconsistent conclusions about
    possible gas absorption towards Alpha PsA with IUE and GHRS
    show the limitation of IUE Studies. Here we propose GHRS
    observations of four of these stars in order to confirm the
    existence of the circumstellar gas, to improve our knowledge
    of such gaseous disk, and to understand the origin of this gas
    at somewhat later stages of the stellar evolution.

Questions                       ! Free format text (please update)

     Observing_Description:
         To detect the gaseous atmosphere of the disk and to have a
         view of the physical state of the circumstellar material
         around the selected stars, we propose to look at
         the following very strong UV lines with LSA and ECH-B:
         Fe II fine structure (385 cm-1) 2598.4A. and (667 cm-1) 
         2607A., in the same domain the Mn II multiplet at 2600A. 
         The Mg II doublet 2802.7A and 2795.5A.
         The presence of gas absorption from Fe II excited
         levels is a strong signature of the circumstellar origin
         while absorptions from excited fine-structure levels require
         densities incompatible with those find in the interstellar
         medium., The following table presents the flux 
         (10E-11erg.s-1.cm-2A.-1), the exposure time (t_e) and S/N 
         at the bottom of the lines.
         
         star (HR)		10   	2174	6519	8675,   
         ------------------------------------------------------
         Flux at 2600A. 	0.10	0.24	1.1	1.8
         Flux at 2800A.		0.09	0.20	0.7	1.5                         
         S/N     		20  	30	40	50 
         t_e (s) at 2600A.      326.4	326.4	108.8	108.8
         t_e (s) at 2800A.	389	391	202	108.8

         In addition and for only the two best candidates (HR 8675 and 
         HR 6519: 51 Oph), we propose to observe with G160M the 1550A. 
         region to search for CO, C I and C IV signatures.

         star		    Lambda		S/N	t_e  
         ---------------------------------------------------
         HR 6519	GM160	1550 A		40 	108.8
         HR 8675	GM160	1550 A		50	407

         These observations will
         allow to compare the velocity field of different species.
         Indeed, these stars have already shown redshift variable
         absorption features (Lagrange-Henri et al. 1990b and Grady et
         al. 1993), and from our Beta Pic analysis, we have shown that
         there are strong differences between the ionised species like
         C IV or Al III which show very large redshift and are
         probably associated with comets-size bodies (Beust et al
         1991, Beust and Tagger 1993), and the other species like C I
         which are mainly at rest.

   Real_Time_Justification:
         None

         None.

Calibration_Justification:   

      Additional_Comments:

! Hipparcos coordinates added 4/12/95 - AFB

Fixed_Targets
  Target_Number:1
    Target_Name:HD256
Alternate_Names:HR10,GSC05838-01289
    Description:STAR, DISK
       Position:RA=00H 07M 18.27S +/- 0.01S,
                DEC=-17D 23' 13.1" +/- 0.1"
        Equinox:J2000
        RV_or_Z:V=0
!          RA_PM:-0.0008      
!         Dec_PM:0.017        
!          Epoch:J2000
           Flux:V=6.2,
		TYPE=A6V,
		B-V=0.14,
		F-CONT(2600)=0.42E-11,
		F-CONT(2800)=0.53E-11
       Comments:Coordinates from Hipparcos INCA 4/12/95

  Target_Number:2
    Target_Name:HD42111
Alternate_Names:HR2174,GSC00135-01616
    Description:STAR, DISK
       Position:RA=06H 08M 57.88S +/- 0.01S,
                DEC=02D 29' 58.9" +/- 0.1"
        Equinox:J2000
        RV_or_Z:V=+34
!          RA_PM:0.000
!         Dec_PM:-0.0122
!          Epoch:J2000
           Flux:V=5.7,
		TYPE=A3V,
		B-V=0.07,
		F-CONT(2600)=0.95E-11,
		F-CONT(2800)=1.2E-11
       Comments:Coordinates from Hipparcos INCA 4/12/95

  Target_Number:3
    Target_Name:HD158643
Alternate_Names:HR6519,GSC06826-00368
    Description:STAR, DISK
       Position:RA=17H 31M 24.96S +/- 0.01S,
                DEC=-23D 57' 45.7" +/- 0.1"
        Equinox:J2000
        RV_or_Z:V=-12
!          RA_PM:0.0003
!         Dec_PM:-0.026
!          Epoch:J2000
Annual_Parallax:0.04
           Flux:V=4.8,
		TYPE=B9.5V,
		B-V=0.00,
		F-CONT(2600)=4.3E-11,
		F-CONT(2800)=4.3E-11
       Comments:Coordinates from Hipparcos INCA 4/12/95

  Target_Number:4
    Target_Name:HD215789
Alternate_Names:HR8675,GSC08453-01499
    Description:STAR, DISK
       Position:RA=22H 48M 33.30S +/- 0.01S,
                DEC=-51D 19' 0.6" +/- 0.1"
        Equinox:J2000
        RV_or_Z:V=-3
!          RA_PM:0.011
!         Dec_PM:-0.071
!          Epoch:J2000
Annual_Parallax:0.044
           Flux:V=3.49,
		TYPE=A3V,
		B-V=0.08,
		F-CONT(2600)=7.1E-11,
		F-CONT(2800)=9.0E-11
       Comments:Coordinates from Hipparcos INCA 4/12/95

!======================================================================
!======================================================================

Visits                                
      Visit_Number:1
Visit_Requirements:                   
    Visit_Comments:

     Exposure_Number:10               
         Target_Name:HD256
              Config:HRS
              Opmode:ACQ
            Aperture:2.0
          Sp_Element:MIRROR-N2
          Wavelength:
 Optional_Parameters:BRIGHT=RETURN
                     LOCATE=DEF
		     SEARCH-SIZE=3
Number_of_Iterations:1
   Time_Per_Exposure:1.8S
Special_Requirements:ONBOARD ACQ FOR 20
            Comments:STEP-TIME=0.2 => Count=1.8e5


     Exposure_Number:20  
         Target_Name:HD256
              Config:HRS
              Opmode:ACQ/PEAKUP
            Aperture:0.25
          Sp_Element:MIRROR-N2
          Wavelength:
 Optional_Parameters:
Number_of_Iterations:1
   Time_Per_Exposure:5S
Special_Requirements:ONBOARD ACQ FOR 32-42
            Comments:STEP-TIME=0.2 => Count=1.2e5

!     Exposure_Number:31  
!         Target_Name:WAVE
!              Config:HRS
!              Opmode:ACCUM
!            Aperture:SC2
!          Sp_Element:ECH-B
!          Wavelength:2603.5
! Optional_Parameters:
!Number_of_Iterations:1
!   Time_Per_Exposure:DEF
!Special_Requirements:SEQ 31-32 NON-INT

     Exposure_Number:32               
         Target_Name:HD256
              Config:HRS
              Opmode:ACCUM
            Aperture:0.25
          Sp_Element:ECH-B
          Wavelength:2603.5
 Optional_Parameters:FP-SPLIT=STD
		     STEP-PATT=DEF
Number_of_Iterations:1
   Time_Per_Exposure:326.4S
Special_Requirements:
            Comments:

     Exposure_Number:42            
         Target_Name:HD256
              Config:HRS
              Opmode:ACCUM
            Aperture:0.25
          Sp_Element:ECH-B
          Wavelength:2800.5
 Optional_Parameters:FP-SPLIT=STD
		     STEP-PATT=DEF
Number_of_Iterations:1
   Time_Per_Exposure:389S
Special_Requirements:
            Comments:

!========================================================
      Visit_Number:2
Visit_Requirements:                   
    Visit_Comments:

     Exposure_Number:10               
         Target_Name:HD42111
              Config:HRS
              Opmode:ACQ
            Aperture:2.0
          Sp_Element:MIRROR-N2
          Wavelength:
 Optional_Parameters:BRIGHT=RETURN
                     LOCATE=DEF
		     SEARCH-SIZE=3
Number_of_Iterations:1
   Time_Per_Exposure:1.8S
Special_Requirements:ONBOARD ACQ FOR 20
            Comments:STEP-TIME=0.2 => Count=3.4e5


     Exposure_Number:20  
         Target_Name:HD42111
              Config:HRS
              Opmode:ACQ/PEAKUP
            Aperture:0.25
          Sp_Element:MIRROR-N2
          Wavelength:
 Optional_Parameters:
Number_of_Iterations:1
   Time_Per_Exposure:5S
Special_Requirements:ONBOARD ACQ FOR 32-42
            Comments:STEP-TIME=0.2 => Count=2.2e5

     Exposure_Number:32               
         Target_Name:HD42111
              Config:HRS
              Opmode:ACCUM
            Aperture:0.25
          Sp_Element:ECH-B
          Wavelength:2603.5
 Optional_Parameters:FP-SPLIT=STD
		     STEP-PATT=DEF
Number_of_Iterations:1
   Time_Per_Exposure:326.4S
Special_Requirements:
            Comments: 

     Exposure_Number:42            
         Target_Name:HD42111
              Config:HRS
              Opmode:ACCUM
            Aperture:0.25
          Sp_Element:ECH-B
          Wavelength:2800.5
 Optional_Parameters:FP-SPLIT=STD
		     STEP-PATT=DEF
Number_of_Iterations:1
   Time_Per_Exposure:391S
Special_Requirements:
            Comments: 

!========================================================
      Visit_Number:3
Visit_Requirements:                   
    Visit_Comments:

     Exposure_Number:10               
         Target_Name:HD158643
              Config:HRS
              Opmode:ACQ
            Aperture:2.0
          Sp_Element:MIRROR-N2
          Wavelength:
 Optional_Parameters:BRIGHT=RETURN
                     LOCATE=DEF
		     SEARCH-SIZE=3
Number_of_Iterations:1
   Time_Per_Exposure:1.8S
Special_Requirements:ONBOARD ACQ FOR 20
            Comments:STEP-TIME=0.2 => Count=1.2e6


     Exposure_Number:20  
         Target_Name:HD158643
              Config:HRS
              Opmode:ACQ/PEAKUP
            Aperture:0.25
          Sp_Element:MIRROR-N2
          Wavelength:
 Optional_Parameters:
Number_of_Iterations:1
   Time_Per_Exposure:5S
Special_Requirements:ONBOARD ACQ FOR 32-52
            Comments:STEP-TIME=0.2 => Count=8.0e5

     Exposure_Number:32               
         Target_Name:HD158643
              Config:HRS
              Opmode:ACCUM
            Aperture:0.25
          Sp_Element:ECH-B
          Wavelength:2603.5
 Optional_Parameters:FP-SPLIT=STD
		     STEP-PATT=DEF
Number_of_Iterations:1
   Time_Per_Exposure:108.8S
Special_Requirements:
            Comments: 

     Exposure_Number:42            
         Target_Name:HD158643
              Config:HRS
              Opmode:ACCUM
            Aperture:0.25
          Sp_Element:ECH-B
          Wavelength:2800.5
 Optional_Parameters:FP-SPLIT=TWO
		     STEP-PATT=DEF
Number_of_Iterations:1
   Time_Per_Exposure:252S
Special_Requirements:
            Comments:The time is computed in order to use 
       the target visibility as much as possible and must be expanded 
       to 5x54.4s= 272s if possible.

     Exposure_Number:52            
         Target_Name:HD158643
              Config:HRS
              Opmode:ACCUM
            Aperture:0.25
          Sp_Element:G160M
          Wavelength:1550
 Optional_Parameters:FP-SPLIT=STD
		     STEP-PATT=DEF
Number_of_Iterations:1
   Time_Per_Exposure:108.8S
Special_Requirements:
            Comments: 

!========================================================
      Visit_Number:4
Visit_Requirements:                   
    Visit_Comments:

     Exposure_Number:10               
         Target_Name:HD215789
              Config:HRS
              Opmode:ACQ
            Aperture:2.0
          Sp_Element:MIRROR-N2
          Wavelength:
 Optional_Parameters:BRIGHT=RETURN
                     LOCATE=DEF
		     SEARCH-SIZE=3
Number_of_Iterations:1
   Time_Per_Exposure:1.8S
Special_Requirements:ONBOARD ACQ FOR 20
            Comments:STEP-TIME=0.2 => Count=2.5e6


     Exposure_Number:20  
         Target_Name:HD215789
              Config:HRS
              Opmode:ACQ/PEAKUP
            Aperture:0.25
          Sp_Element:MIRROR-N2
          Wavelength:
 Optional_Parameters:
Number_of_Iterations:1
   Time_Per_Exposure:5S
Special_Requirements:ONBOARD ACQ FOR 32-52
            Comments:STEP-TIME=0.2 => Count=1.6e6

     Exposure_Number:32               
         Target_Name:HD215789
              Config:HRS
              Opmode:ACCUM
            Aperture:0.25
          Sp_Element:ECH-B
          Wavelength:2603.5
 Optional_Parameters:FP-SPLIT=STD
		     STEP-PATT=DEF
Number_of_Iterations:1
   Time_Per_Exposure:108.8S
Special_Requirements:
            Comments:

     Exposure_Number:42            
         Target_Name:HD215789
              Config:HRS
              Opmode:ACCUM
            Aperture:0.25
          Sp_Element:ECH-B
          Wavelength:2800.5
 Optional_Parameters:FP-SPLIT=STD
		     STEP-PATT=DEF
Number_of_Iterations:1
   Time_Per_Exposure:108.8S
Special_Requirements:
            Comments:

     Exposure_Number:52            
         Target_Name:HD215789
              Config:HRS
              Opmode:ACCUM
            Aperture:0.25
          Sp_Element:G160M
          Wavelength:1550
 Optional_Parameters:FP-SPLIT=STD
		     STEP-PATT=DEF
Number_of_Iterations:1
   Time_Per_Exposure:407S
Special_Requirements:
            Comments:The time is computed in order to use 
       the target visibility as much as possible and must be expanded 
       to 4x108.8s= 435.2s if possible. 

      Visit_Number:5
Visit_Requirements:                   
    Visit_Comments:

     Exposure_Number:10               
         Target_Name:HD158643
              Config:HRS
              Opmode:ACQ
            Aperture:2.0
          Sp_Element:MIRROR-N2
          Wavelength:
 Optional_Parameters:BRIGHT=RETURN
                     LOCATE=DEF
		     SEARCH-SIZE=3
Number_of_Iterations:1
   Time_Per_Exposure:1.8S
Special_Requirements:ONBOARD ACQ FOR 20
            Comments:STEP-TIME=0.2 => Count=1.2e6


     Exposure_Number:20  
         Target_Name:HD158643
              Config:HRS
              Opmode:ACQ/PEAKUP
            Aperture:0.25
          Sp_Element:MIRROR-N2
          Wavelength:
 Optional_Parameters:
Number_of_Iterations:1
   Time_Per_Exposure:5S
Special_Requirements:ONBOARD ACQ FOR 32-52
            Comments:STEP-TIME=0.2 => Count=8.0e5

     Exposure_Number:32               
         Target_Name:HD158643
              Config:HRS
              Opmode:ACCUM
            Aperture:0.25
          Sp_Element:ECH-B
          Wavelength:2603.5
 Optional_Parameters:FP-SPLIT=STD
		     STEP-PATT=DEF
Number_of_Iterations:1
   Time_Per_Exposure:108.8S
Special_Requirements:
            Comments: 

     Exposure_Number:42            
         Target_Name:HD158643
              Config:HRS
              Opmode:ACCUM
            Aperture:0.25
          Sp_Element:ECH-B
          Wavelength:2800.5
 Optional_Parameters:FP-SPLIT=TWO
		     STEP-PATT=DEF
Number_of_Iterations:1
   Time_Per_Exposure:252S
Special_Requirements:
            Comments:The time is computed in order to use 
       the target visibility as much as possible and must be expanded 
       to 5x54.4s= 272s if possible.

     Exposure_Number:52            
         Target_Name:HD158643
              Config:HRS
              Opmode:ACCUM
            Aperture:0.25
          Sp_Element:G160M
          Wavelength:1550
 Optional_Parameters:FP-SPLIT=STD
		     STEP-PATT=DEF
Number_of_Iterations:1
   Time_Per_Exposure:108.8S
Special_Requirements:
            Comments: 


!========================================================
!
!
!
!
!========================================================

Data_Distribution                       ! Defaults indicated; change if desired

         Medium:        8MM             ! 8MM or 6250BPI or 1600BPI
Blocking_Factor:        10              ! 10 or 1
                                        ! Only astronomers with very old 9-
                                        ! track tape drives should consider
                                        ! a blocking factor of 1

        Ship_To:        PI_Address      ! STSCI or PI_Address or <free-text>
                                        ! PI Address from Phase I is:
                                        !
                                        !  IAP
                                        !  98 Bis Bld Arago
                                        !  F-75014 PARIS FRANCE
                                        !  
                                        !
       Ship_Via:        UPS             ! UPS (2-day) or OVERNIGHT
                                        ! Overnight shipping done at PI expense

Recipient_Email:                        ! Needed if Ship_To: is not PI_Address
                                        ! <free-text>