! Recived Fri, 10 Feb 95 09:52:25 +0100 !To: phase2prop@stsci.edu !Subject: phase2 submission !__Proposal-Section__ !6130 ! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template ! $Id: 6130,v 5.1 1995/05/04 16:05:21 pepsa Exp $ ! ! 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: Christian Ready ! Phone: 410 338-4546 , E-mail: ready@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. ! Date generated: Mon Dec 19 08:34:01 EST 1994 ! Proposal_Information ! Section 4 Title: FOC Objective Prism Observations of SN 1987A Proposal_Category: GO Scientific_Category: Interstellar Medium Cycle: 5 Investigators PI_name: Peter Jakobsen PI_Institution: Astrophysics Division, ESA/ESTEC CoI_Name: P. Greenfield CoI_Institution: Space Telescope Science Institute Contact: N CoI_Name: R. Jedrzejewski CoI_Institution: Space Telescope Science Institute Contact: N CoI_Name: A. Picard CoI_Institution: Astrophysics Division, ESA/ESTEC Contact: N Abstract: We intend to observe SN 1987A and its surroundings with the FOC using the near-UV objective prism. The main purpose of the observations is to carry out a more detailed study of the wavelength dependence of the apparent angular size and shape of the resolved supernova envelope, and thereby gain further information on the emission and absorption processes at work in the ejecta. The data will also be useful for determining the emission processes responsible for the UV flux recently detected from the SN 1987A circumstellar ring. Questions Observing_Description: Our considerable experience with FOC prism observations has shown that the particle and sky background experienced by the FOC varies somewhat with HST orbital position and orientation. Rather than attempt to introduce complex and overly restrictive constraints on the scheduling system, we have instead developed a simple, but effective, observing strategy that involves limiting individual FOC prism exposures of faint targets roughly ~20 minute duration and co -adding the individually reduced exposures in an optimal manner. This technique also has the important benefit of allowing the individual sub-spectra to be shifted slightly on the FOC detector through offset pointing (by a few tenths of an arcsecond) in order to reduce reseau mark and residual flat-field effects in the resulting combined spectrum. Assuming a visibility of 59 minutes for SN 1987A, it follows that two such ~25 minute sub-exposures are achievable per orbit and that a total of ~6 orbits are required to reach the desired total exposure time of ~5 hours. All exposures are blind ``point and shoot'' (Mode III) and no special calibration exposures are required beyond routine Cycle 5 calibrations. Real_Time_Justification: The observations should be scheduled avoiding certain values of the HST Roll angle so as to avoid overlap of the dispersed images of SN 1987A, the two companion stars 2 and 3, and the fainter star superimposed on the ring. This is accomplished for roll angles equivalent to ORIENTATION=30 +\- 15 degrees (or 180 degrees from this roll). We also note that since the images of the two bright companion stars posed no risk to the FOC in terms of excessive countrate during the F275W exposures of Jakobsen et al. (1994), this will also be the case for the observations proposed here, since there is less projected flux per pixel in the near-UV prism than in the F275W filter. (The same does not, however, hold for the visible part of the far-UV prism (PRISM1) -- which is not used in this program) Calibration_Justification: Fixed_Targets Target_Number: 1 Target_Name: SN1987A Alternate_Names: Description: EXT-MEDIUM,SNR Position: RA = 05H 35M 28.1S +/- 0.1S, DEC = -69D 16' 13.0" +/- 1" !Note: these coordinates have successfully been used during Cycle 4 Equinox: 2000 Flux: F(2750)=8 +/- 4 E-17 Comments: Extrapolated Day 3000 Flux Visits Visit_Number: 1 Visit_Requirements: ORIENT 195D TO 225D On_Hold_Comments: Visit_Comments: ORIENT 15D TO 45D also OK Exposure_Number: 1 Target_Name: SN1987A Config: FOC/96 Opmode: IMAGE Aperture: 512x1024 Sp_Element: PRISM2 Wavelength: 2800 Optional_Parameters: PIXEL=25x25 Number_of_Iterations: 1 Time_Per_Exposure: 1100S Special_Requirements: POS TARG 0, -1.4 Exposure_Number: 2 Target_Name: SN1987A Config: FOC/96 Opmode: IMAGE Aperture: 512x1024 Sp_Element: PRISM2 Wavelength: 2800 Optional_Parameters: PIXEL=25x25 Number_of_Iterations: 1 Time_Per_Exposure: 1100S Special_Requirements: POS TARG 0, -1.6 Exposure_Number: 3 Target_Name: SN1987A Config: FOC/96 Opmode: IMAGE Aperture: 512x1024 Sp_Element: PRISM2 Wavelength: 2800 Optional_Parameters: PIXEL=25x25 Number_of_Iterations: 1 Time_Per_Exposure: 1400S Special_Requirements: POS TARG 0, -1.8 Exposure_Number: 4 Target_Name: SN1987A Config: FOC/96 Opmode: IMAGE Aperture: 512x1024 Sp_Element: PRISM2 Wavelength: 2800 Optional_Parameters: PIXEL=25x25 Number_of_Iterations: 1 Time_Per_Exposure: 1400S Special_Requirements: POS TARG 0.2, -1.4 Exposure_Number: 5 Target_Name: SN1987A Config: FOC/96 Opmode: IMAGE Aperture: 512x1024 Sp_Element: PRISM2 Wavelength: 2800 Optional_Parameters: PIXEL=25x25 Number_of_Iterations: 1 Time_Per_Exposure: 1400S Special_Requirements: POS TARG 0.2, -1.6 Exposure_Number: 6 Target_Name: SN1987A Config: FOC/96 Opmode: IMAGE Aperture: 512x1024 Sp_Element: PRISM2 Wavelength: 2800 Optional_Parameters: PIXEL=25x25 Number_of_Iterations: 1 Time_Per_Exposure: 1400S Special_Requirements: POS TARG 0.2, -1.8 Exposure_Number: 7 Target_Name: SN1987A Config: FOC/96 Opmode: IMAGE Aperture: 512x1024 Sp_Element: PRISM2 Wavelength: 2800 Optional_Parameters: PIXEL=25x25 Number_of_Iterations: 1 Time_Per_Exposure: 1400S Special_Requirements: POS TARG 0.4, -1.4 Exposure_Number: 8 Target_Name: SN1987A Config: FOC/96 Opmode: IMAGE Aperture: 512x1024 Sp_Element: PRISM2 Wavelength: 2800 Optional_Parameters: PIXEL=25x25 Number_of_Iterations: 1 Time_Per_Exposure: 1400S Special_Requirements: POS TARG 0.4, -1.6 Exposure_Number: 9 Target_Name: SN1987A Config: FOC/96 Opmode: IMAGE Aperture: 512x1024 Sp_Element: PRISM2 Wavelength: 2800 Optional_Parameters: PIXEL=25x25 Number_of_Iterations: 1 Time_Per_Exposure: 1400S Special_Requirements: POS TARG 0.4, -1.8 Exposure_Number: 10 Target_Name: SN1987A Config: FOC/96 Opmode: IMAGE Aperture: 512x1024 Sp_Element: PRISM2 Wavelength: 2800 Optional_Parameters: PIXEL=25x25 Number_of_Iterations: 1 Time_Per_Exposure: 1400S Special_Requirements: POS TARG -0.2, -1.4 Exposure_Number: 11 Target_Name: SN1987A Config: FOC/96 Opmode: IMAGE Aperture: 512x1024 Sp_Element: PRISM2 Wavelength: 2800 Optional_Parameters: PIXEL=25x25 Number_of_Iterations: 1 Time_Per_Exposure: 1400S Special_Requirements: POS TARG -0.2, -1.6 Exposure_Number: 12 Target_Name: SN1987A Config: FOC/96 Opmode: IMAGE Aperture: 512x1024 Sp_Element: PRISM2 Wavelength: 2800 Optional_Parameters: PIXEL=25x25 Number_of_Iterations: 1 Time_Per_Exposure: 1400S Special_Requirements: POS TARG -0.2, -1.8 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 ! PI Address from Phase I is: ! ! 2200 AG Noordwijk ! ! Ship_Via: UPS ! UPS (2-day) or OVERNIGHT ! Overnight shipping done at PI expense Recipient_Email: ! Needed if Ship_To: is not PI_Address ! ! Let us know what you think of this template and software! ! Please send a list of your likes and dislikes to your Program Coordinator !__Diagnostic-Sum-Section__ !Software-Version (Controller= 1.0) !Preprocessor (Errors= 0 Fatal-Errors= 0 ) !Validation (Errors= 0 Fatal-Errors= 0 ) !Transformation (Errors= 1 Fatal-Errors= 0 ) !CASM (Errors= 0 Fatal-Errors= 0 ) !__User-Comments__