6519( 6) - 12/09/96 15:39 - [ 0] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6519 Version: 6 Check-in Date: 09-Dec-1996 15:37:43 1.Proposal Title: Parallel high resolution imaging of diffuse objects in the Magellanic Clouds ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle INTERSTELLAR MEDIUM GO 6 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: JEREMY WALSH SPACE TELESCOPE EUROPEAN COORDINATING FACILITY CoI: Dr. You-Hua Chu University of Illinois N CoI: Dr. Donald Garnett University of Minnesota N CoI: Dr. Mohammad Heydari-Malayeri Institut d'Astrophysique N CoI: Dr. Barry Lasker Space Telescope Science Institute N CoI: Prof. James Lequeux Observatoire de Paris, Meudon N CoI: Prof. John Meaburn University of Manchester N CoI: Dr. George Meylan European Southern Observatory N CoI: Dr. Nicole Meyssonnier Observatoire de Marseille N CoI: Dr. Marc Azzopardi Observatoire de Marseille N ------------------------------------------------------------------------------------ 6. Abstract The Magellanic Clouds, because of their well-determined distance and small extinction, allow an unprecedented opportunity to observe many ISM phenomena occurring in a whole galaxy. The HST resolution (0.1" = 0.025 pc) offers detail hitherto poorly studied in the extragalactic context on the morphology and spatial relationships in various ISM processes associated with the evolution of Population I and Population II systems. This long term (11 cycles) parallel program exploits these opportunities by obtaining WFPC2 images of appropriate targets that are accessible at the same time as primary pointings. The number of priority parallel observations per Cycle is estimated at ~20; and our intent is to accumulate a significant archive of Magellanic Cloud direct images over the life of the program. The parallel targets, to be specified in crafting rules executed as part of the Phase II planning of each HST Cycle, will include (or search for) compact H II regions and young clusters, proto-stellar and maser regions, reflection nebulae, Herbig-Haro objects, stellar ejecta, SNR and wind-driven shells, shells, planetary nebulae and Very Low Excitation nebulae. The observations will be primarily in the Balmer lines and the stronger forbidden lines, with supplemental continuum images. ------------------------------------------------------------------------------------ Observations Description ------------------------ Pure parallel images of a variety of diffuse nebular objects in the Small and Large Magellanic Clouds are to be obtained with WFPC2. The primary pointings of HST in the Magellanic Clouds will provide the basis for this project. For each primary (FOS or FOC) pointing listed in the approved primary target list of a given Cycle, an appropriate annulus around the target is examined (against catalogs and direct images) for the kinds of nebular and stellar targets described in the scientific justification. Beginning in Cycle 5, we have, with STScI help, succesfully translated this strategy into a set of crafting rules for efficiently identifying parallel opportunities that can be attached to the FOS or FOC pointings; and the improved productivity of this program, beginning in Cycle 5, attests to the efficacy of this technique. If an object of interest occurs within the WFPC2 field at an accessible roll angle, emission line images in narrow bands and continuum images in broad band filters will be requested. (The default roll-angle must be used in our object selection but we delimit ranges of roll-angles of particular advantage to our program dependent on the pointing position.) The targets of interest cover a broad range - to ensure a strong probability of obtaining images - from proto- stellar regions, through HII regions, supernova remnants and shells, to evolved objects around high mass stars to planetary nebulae. Depending on the object and the exposure time of the primary pointing, a variety of emission line and or continuum images will be taken. Example objects are given in the Observing Summary. These are not program targets as the target selection is entirely dictated by the primary pointings. The program relies heavily on the primary pointings which clearly will differ from cycle to cycle. However we do not expect our methods or proposed targets to change substantially from year to year. On the basis of planning in previous cycles, there were about 30 hours of FOS and FOC pointings in the Magellanic Clouds, from which we selected the most promising fields (eliminating short primary exposures), giving >=20 hours of parallel imaging. Similar estimates hold for further cycles dependant on the pattern of primary observations. Over the envisaged lifetime of this program, a potentially valuable archive of a few hundred images of Magellanic Cloud nebulae will accrue. In Cycles 2-4 we had many parallel opportunities but only a few observations (Six images in Cycle 2, four in Cycle 3 and two in Cycle 4). However, beginning in Cycle 5, the improvements in scheduling procedures, together with the repaired HST PSF, have already enabled deep images of two fields around SN1987A to be obtained; the data is currently under analysis. We anticipate that a larger number of parallel images of the Magellanic Clouds will result, leading to new scientific results. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: Dr. Donald Garnett*University of Minnesota*Astronomy Department*116 Church St. S.E.*Minneapolis, MN 55455 Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 6519( 6) - 12/09/96 15:39 - [ 1] TARGET LIST c)Generic Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Selection Criteria | Flux data No | Name | Description | | ------------------------------------------------------------------------------------------------------------------------------------ PAR EXT-CLUSTER RA=05H 38M 52.8S,DEC=-69D 6' 43.0",R=5D ------------------------------------------------------------------------------------------------------------------------------------ 6519( 6) - 12/09/96 15:39 - [ 2] Visit: 01 Visit Requirements: PARallel On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PAR WFPC2 IMAGE WFALL F606W 1 20 M ------------------------------------------------------------------------------------------------------------------------------------ 6519( 6) - 12/09/96 15:39 - [ 3] Summary Form for Proposal 6519 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category INTERSTELLAR MEDIUM ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PARallel ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W ------------------------------------------------------------------------------------------------------------------------------------ Target Names PAR ------------------------------------------------------------------------------------------------------------------------------------