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!  | PED OUTPUT PRODUCT |
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!  /spectre/data1/aroman/proposals/6001.prop
!  Generated by PREPROCESSOR, version 6.0e
!  Date: Sat Dec 30 17:47:41 EST 1995

Proposal_Information
              Title: NGC 5253 STARBURST AS A LABORATORY FOR ENRICHMENT PROCESSES
  Proposal_Category: GO
Scientific_Category: Galaxies & Clusters
              Cycle: 5


Investigators

            PI_Name: Jean-Rene ROY
     PI_Institution: Universite Laval


           CoI_Name: Jeremy WALSH
    CoI_Institution: European Southern Observatory
            Contact: 

           CoI_Name: Michael ROSA
    CoI_Institution: European Southern Observatory
            Contact: 


Abstract:
The nearby starburst in NGC 5253 presents a unique snapshot of
the short stage of element enrichment and an unprecedented
opportunity to study the interaction between evolving massive
stars and the interstellar medium. We propose to observe NGC
5253 with FOS to: (i) determine the carbon abundance near a
region of enhanced nitrogen found from the ground to be
associated with Wolf-Rayet stars, and (ii) to study the
stellar population in the central starburst knots and to model
their age and IMF in order to relate the stellar properties to
the ISM enrichment. HST provides the long wavelength coverage
to allow determination of element abundances, IMF and
starburst age from stellar signatures, together with the high
spatial resolution to measure change over arcsec scales. The
proposed observations should result in a fundamental
understanding of the link between starbursts and enrichment
mechanisms of relatively low metallicity gas.


Questions


    Observing_Description:
It is proposed to observe three of the starburst knots in the
dwarf elliptical blue compact galaxy NGC 5253 with the FOS
and the 0.86'' round aperture; one of these knots is known to
be enhanced in N from ground-based spectroscopy.  The
emission lines of H, C, N and O will be studied for abundance
derivations, and the stellar continuum from 1150 to 8200
Angstrom\\\\ will be measured to assess the stellar population
from O to G stars. Spectra at identical positions in the full
UV range and in the optical to 8200 Angstrom\\\\ are needed. Full
wavelength coverage between 1150 and 8200 Angstrom\\\\ will be
achieved by two grating exposures with the blue tube (G130H
and G190H) and four grating exposures with the amber tube
(G270H, G400H, G570 and G 780H) of each of the three knots.
Accurate positions of the knots will be derived from archive
WFPC images of NGC 5253 to be released in september 1994.
From our ground-based spectroscopic mapping of NGC 5253, we
have been able to measure the V surface brightness of the
stellar continuum in the three knots to be observed, here
named UV1, UV2  and UV3 (corresponding to regions 1, 6 and 2
respectively in Walsh & Roy (1989). The V surface brightness
is 18.4 mag arcsec^-2 for both UV1 and UV3 and 18.8 for UV2. The
extinction for UV1 is A_V = 0.96 mag, and similar for UV2 and UV3.
We aim for a fairly uniform S/N across all the grating
domains, so that we can disentangle the various stellar
contributions. With S/N >= 10 on the continuum, we will get
good line fluxes since the minimum H Beta\\\\ equivalent width
(in UV2) is 36 and the C III 1908 Angstrom\\\\ line has an
equivalent width of ~5.  Section lists the requested exposure
times in seconds for V = 18.5, A_V = 0.9 for each grating for
a mean of 200 counts/diode (S/N ~ 12). For the G130H
spectrum, the exposure time has been estimated for 100 counts
per bin. Since the resolution is higher for this grating, we
can bin by a factor 3, so we reduce the exposure time to 3000
s.  The largest fraction of exposure time is spent on this
wavelength region and is justified by its astrophysical
importance. For the six grating exposures, 3 orbits are
required per starburst knot. We plan to obtain the color of
acquisition stars around NGC 5253 from archive HST frames,
and use acq/binary; we will check the images for extended
sources which would confuse the acq/binary.  The centering
should be ~0.5 arcsec.

  Real_Time_Justification:


Calibration_Justification:


      Additional_Comments:
Should be scheduled in cooperation
wit a related proposal, proposal number 6021 (Kobulnicky and Skillman),
for best efficiency. This file is intended to be merged with 6021 to
achieve a 12-orbit, 2-visit schedule file. Targets list in this file is
same as 6021, for completeness, though not all targets are observed
in this visit.


Fixed_Targets

  Target_Number: 1
    Target_Name: STAR-OFFSET
Alternate_Names: 
    Description: STAR
       Position: RA=13H 39M 51.7925S +/- 0.01S,DEC=-31D 39' 03.244" +/- 0.1"
        Equinox: J2000
        RV_or_Z: 
          RA_PM: 0.0
         Dec_PM: 0.0
          Epoch: 
Annual_Parallax: 0.0
           Flux: 
                V = 14.5+/-0.5
                B-V = 0.5+/-0.5
       Comments: 

  Target_Number: 2
    Target_Name: NGC5253-UV1
Alternate_Names: 
    Description: EXT-MEDIUM, HII REGION
       Position: RA-OFF=4.03S+/- 0.01S,DEC-OFF=35.93"+/- 0.1",FROM 1
        Equinox: J2000
        RV_or_Z: V = +400
          RA_PM: 0.0
         Dec_PM: 0.0
          Epoch: 
Annual_Parallax: 0.0
           Flux: 
                SURF(V) = 18.4+/-0.2
                B-V = 0.0
                A(V) = 0.9
       Comments: Object in the galaxy is a stellar cluster

  Target_Number: 3
    Target_Name: NGC5253-UV2
Alternate_Names: 
    Description: EXT-MEDIUM, HII REGION
       Position: RA-OFF=4.08S+/- 0.01S,DEC-OFF=31.54"+/- 0.1",FROM 1
        Equinox: J2000
        RV_or_Z: V = +400
          RA_PM: 0.0
         Dec_PM: 0.0
          Epoch: 
Annual_Parallax: 0.0
           Flux: 
                SURF(V) = 18.8+/-0.2
                B-V = 0.0
                A(V) = 0.9
       Comments: Object in the galaxy is a stellar cluster

  Target_Number: 4
    Target_Name: NGC5253-UV3
Alternate_Names: 
    Description: EXT-MEDIUM, HII REGION
       Position: RA-OFF=3.63S+/- 0.01S,DEC-OFF=33.70"+/- 0.1",FROM 1
        Equinox: J2000
        RV_or_Z: V = +400
          RA_PM: 0.0
         Dec_PM: 0.0
          Epoch: 
Annual_Parallax: 0.0
           Flux: 
                SURF(V) = 18.4+/-0.2
                B-V = 0.0
                A(V) = 0.9
       Comments: Object in the galaxy is a stellar cluster

  Target_Number: 5
    Target_Name: NGC5253-HII-1
Alternate_Names: 
    Description: EXT-MEDIUM, HII REGION
       Position: RA-OFF=4.061S+/- 0.01S,DEC-OFF=37.31"+/- 0.1",FROM 1
        Equinox: J2000
        RV_or_Z: V = +400
          RA_PM: 0.0
         Dec_PM: 0.0
          Epoch: 
Annual_Parallax: 0.0
           Flux: 
                SURF(V) = 18.4+/-0.2
                B-V = 0.0
                A(V) = 0.9
       Comments: Object in the galaxy is location in an HII region suspected
to be N enriched

  Target_Number: 6
    Target_Name: NGC5253-HII-2
Alternate_Names: 
    Description: EXT-MEDIUM, HII REGION
       Position: RA-OFF=4.007S+/- 0.01S,DEC-OFF=39.13"+/- 0.1",FROM 1
        Equinox: J2000
        RV_or_Z: V = +400
          RA_PM: 0.0
         Dec_PM: 0.0
          Epoch: 
Annual_Parallax: 0.0
           Flux: 
                SURF(V) = 18.4+/-0.2
                B-V = 0.0
                A(V) = 0.9
       Comments: Object in the galaxy is location in an HII region far from
the N enriched location


Solar_System_Targets


Generic_Targets


Scan_Data


Visits

      Visit_Number: 01
Visit_Requirements: 
  On_Hold_Comments: 
    Visit_Comments: To be coordinated with Kobulnicky and Skillman (6021) NGC 5253 observations which comprises an additional visit.

     Exposure_Number: 1
         Target_Name: STAR-OFFSET
              Config: FOS/RD
              Opmode: ACQ/PEAK
            Aperture: 4.3
          Sp_Element: MIRROR
          Wavelength: 
 Optional_Parameters: SEARCH-SIZE-X=1,SEARCH-SIZE-Y=3,SCAN-STEP-Y=1.23
Number_of_Iterations: 1
   Time_Per_Exposure: 1S
Special_Requirements: 
                ONBOARD ACQ FOR 2
            Comments: Pattern A on offset star

     Exposure_Number: 2
         Target_Name: STAR-OFFSET
              Config: FOS/RD
              Opmode: ACQ/PEAK
            Aperture: 1.0
          Sp_Element: MIRROR
          Wavelength: 
 Optional_Parameters: SEARCH-SIZE-X=6,SEARCH-SIZE-Y=2,SCAN-STEP-X=0.61,SCAN-STEP-Y=0.61
Number_of_Iterations: 1
   Time_Per_Exposure: 1S
Special_Requirements: 
                ONBOARD ACQ FOR 3
            Comments: Pattern B1 on offset star

     Exposure_Number: 3
         Target_Name: STAR-OFFSET
              Config: FOS/RD
              Opmode: ACQ/PEAK
            Aperture: 0.3
          Sp_Element: MIRROR
          Wavelength: 
 Optional_Parameters: SEARCH-SIZE-X=5,SEARCH-SIZE-Y=5,SCAN-STEP-X=0.17,SCAN-STEP-Y=0.17
Number_of_Iterations: 1
   Time_Per_Exposure: 1S
Special_Requirements: 
                ONBOARD ACQ FOR 4-34
            Comments: Pattern D1 on offset star to achive 0."1 centering,
errors will then be dominated by errors in offsets

     Exposure_Number: 4
         Target_Name: NGC5253-UV1
              Config: FOS/RD
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G270H
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 1
   Time_Per_Exposure: 99S
Special_Requirements: 
            Comments: 

     Exposure_Number: 5
         Target_Name: NGC5253-UV1
              Config: FOS/RD
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G780H
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 1
   Time_Per_Exposure: 2000S
Special_Requirements: 
            Comments: 

     Exposure_Number: 6
         Target_Name: NGC5253-UV1
              Config: FOS/RD
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G570H
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 1
   Time_Per_Exposure: 185S
Special_Requirements: 
            Comments: 

     Exposure_Number: 7
         Target_Name: NGC5253-UV1
              Config: FOS/RD
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G400H
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 1
   Time_Per_Exposure: 90S
Special_Requirements: 
            Comments: 

     Exposure_Number: 8
         Target_Name: NGC5253-UV1
              Config: FOS/RD
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G190H
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 1
   Time_Per_Exposure: 240S
Special_Requirements: 
            Comments: 

     Exposure_Number: 9
         Target_Name: NGC5253-UV1
              Config: FOS/RD
              Opmode: ACQ
            Aperture: 4.3
          Sp_Element: MIRROR
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 1
   Time_Per_Exposure: 20S
Special_Requirements: 
            Comments: 

     Exposure_Number: 10
         Target_Name: NGC5253-UV2
              Config: FOS/RD
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G190H
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 1
   Time_Per_Exposure: 250S
Special_Requirements: 
            Comments: 

     Exposure_Number: 11
         Target_Name: NGC5253-UV2
              Config: FOS/RD
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G270H
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 1
   Time_Per_Exposure: 90S
Special_Requirements: 
            Comments: 

     Exposure_Number: 12
         Target_Name: NGC5253-UV2
              Config: FOS/RD
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G400H
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 1
   Time_Per_Exposure: 90S
Special_Requirements: 
            Comments: 

     Exposure_Number: 13
         Target_Name: NGC5253-UV2
              Config: FOS/RD
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G570H
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 1
   Time_Per_Exposure: 185S
Special_Requirements: 
            Comments: 

     Exposure_Number: 20
         Target_Name: NGC5253-UV2
              Config: FOS/RD
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G780H
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 1
   Time_Per_Exposure: 1870S
Special_Requirements: 
            Comments: 

     Exposure_Number: 21
         Target_Name: NGC5253-UV3
              Config: FOS/RD
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G780H
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 1
   Time_Per_Exposure: 2390S
Special_Requirements: 
            Comments: 

     Exposure_Number: 22
         Target_Name: NGC5253-UV3
              Config: FOS/RD
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G570H
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 1
   Time_Per_Exposure: 550S
Special_Requirements: 
            Comments: 

     Exposure_Number: 23
         Target_Name: NGC5253-UV3
              Config: FOS/RD
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G400H
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 1
   Time_Per_Exposure: 300S
Special_Requirements: 
            Comments: 

     Exposure_Number: 24
         Target_Name: NGC5253-UV3
              Config: FOS/RD
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G270H
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 1
   Time_Per_Exposure: 200S
Special_Requirements: 
            Comments: 

     Exposure_Number: 25
         Target_Name: NGC5253-UV3
              Config: FOS/RD
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G190H
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 1
   Time_Per_Exposure: 600S
Special_Requirements: 
            Comments: 

     Exposure_Number: 31
         Target_Name: NGC5253-UV3
              Config: FOS/BL
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G130H
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 1
   Time_Per_Exposure: 1380S
Special_Requirements: 
            Comments: 

     Exposure_Number: 32
         Target_Name: NGC5253-UV2
              Config: FOS/BL
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G130H
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 1
   Time_Per_Exposure: 1040S
Special_Requirements: 
            Comments: 

     Exposure_Number: 33
         Target_Name: NGC5253-UV1
              Config: FOS/BL
              Opmode: ACCUM
            Aperture: 1.0
          Sp_Element: G130H
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 1
   Time_Per_Exposure: 1000S
Special_Requirements: 
            Comments: 

     Exposure_Number: 34
         Target_Name: NGC5253-UV1
              Config: FOS/BL
              Opmode: ACQ
            Aperture: 4.3
          Sp_Element: MIRROR
          Wavelength: 
 Optional_Parameters: 
Number_of_Iterations: 1
   Time_Per_Exposure: 20S
Special_Requirements: 
                SAME POS AS 33
            Comments: 

Data_Distribution         ! Defaults indicated; change if desired

         Medium: 8MM
Blocking_Factor: 10
        Ship_To: Departement de physique*Universite Laval*Quebec, Qc G1K 7P4, Canada
       Ship_Via: UPS
Recipient_Email: 

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