5976( 8) - 11/22/95 13:40 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5976 Version: 8 Check-in Date: ********** 1.Proposal Title: Herbig-Haro Objects Near the Orion Nebula ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Interstellar Medium GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: C. Robert O'Dell Space Physics and Astronomy, Rice University CoI: David Axon Space Telescope Science Institute N CoI: Michael G. Burton University of New South Wales N CoI: Patrick M. Hartigan Rice University N CoI: John C. Raymond Center for Astrophysics N ------------------------------------------------------------------------------------ 6. Abstract We propose to make WFPC2 images of both of the centers of known Herbig-Haro objects near the Orion Nebula in the two emission lines most sensitive to delineating their structure. The northern region has multiple Herbig-Haro objects appearing to have a common source, which is located at or near the BN- IRc2 source buried within the Orion Molecular Cloud-1. The southern region is near theta^2 A Ori and seems to lie well in front of the main ionization layer of the nebula. The proposed images should allow us to accurately determine the mechanisms of excitation of these Herbig -Haro objects and their interaction with the ambient nebula and cloud gas. The fact that we have a good basic understanding of the major structure of this region, that there is a concentration of at least 10 Herbig-Haro objects in this area, and there is a good knowledge of the age and distance of the associated stellar cluster makes this the most promising region for the collective study of Herbig-Haro objects. The observations proposed would be in the SII F673N and OI F631N filters and would supplement observations in OIII F502N, HI F656N, and NII F658N already scheduled for the PI's GTO program. ------------------------------------------------------------------------------------ 5976( 8) - 11/22/95 13:40 - [ 2] Observations Description ------------------------ The observations involve pointings at both the north and south Herbig-Haro object complexes. At both pointings one orbit will be spent in imaging in F631N(OI 6300 Angstroms) and a second orbit for F673N(SII 6717+6731 Angstrom). Our previous observations in the north (600s) gave peak counts of 600 in F673N. Our previous observations in the south (600s) gave 700 and 100 peak counts in F673N and F631N respectively. Even considering the probable concentration of the light into sharper images, at least three times the total exposure is needed, especially if we are to reach the fainter features. The observing plan would be to make three exposures per orbit, all in the same filter, which would allow a total exposure time of 1800 s and good cosmic ray subtraction. The peak signal would then be about 2000 counts. If time is not available for both filter settings at each pointing, we would want to image both pointings in the F631N filter. As indicated in the figure in section 10, it is our intent to locate the south pointing so that the PC CCD includes both HH -203 and HH-204 (near PA=315D) and the north pointing so that all of the known Herbig-Haro objects fall within the field (PA=270D). Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 5976( 8) - 11/22/95 13:40 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC1976-SE ISM,HII REGION,HERBIG- RA = 5H 32M 56.550S +/- 0.01S, 1950 SURF-LINE(6563) = 1.1 +/- 0.1 E-10 HARO OBJECT,EMISSION DEC = -05D 27' 29.6" +/- 1" LINE NEBULA Comments: Surface brightness given is for the entire line. 2 NGC1976- ISM,HII REGION,HERBIG- RA = 5H 32M 56.550S, DEC = -05D 1950 SURF-LINE(6563) = 1.1 +/- 0.1 E-10 SEPAR HARO OBJECT,EMISSION 27' 29.6", REGION, R=5' LINE NEBULA Comments: Surface brightness given is for the entire line. 3 NGC1976-NW ISM,HII REGION,HERBIG- RA = 5H 32M 46.292S +/- 0.01S, 1950 SURF-LINE(6563) = 1.1 +/- 0.1 E-10 HARO OBJECT,EMISSION DEC = -05D 23' 40.6" +/- 1" LINE NEBULA Comments: Surface brightness given is for the entire line. 4 NGC1976- ISM,HII REGION,HERBIG- RA = 5H 32M 46.292S, DEC = -05D 1950 SURF-LINE(6563) = 1.1 +/- 0.1 E-10 NWPAR HARO OBJECT,EMISSION 23' 40.6", REGION, R=5' LINE NEBULA Comments: Surface brightness given is for the entire line. 5976( 8) - 11/22/95 13:40 - [ 4] Visit: 01 Visit Requirements: ORIENT 314.0D TO 316.0D 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 NGC1976-SE WFPC2 IMAGE WFALL F631N CLOCKS=YES, CR- 1 700S NO SPLIT; SEQ 1,3,5 NON-INT SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC1976- FOS/RD ACCUM 4.3 G270H 1 400S PAR WITH 1 SEPAR Comments: COORD PARALLEL WITH 1 ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC1976-SE WFPC2 IMAGE WFALL F631N CLOCKS=YES, CR- 1 700S NO SPLIT SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC1976- FOS/RD ACCUM 4.3 G270H 1 340S PAR WITH 3 SEPAR Comments: COORD PARALLEL WITH 3 ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC1976-SE WFPC2 IMAGE WFALL F631N CLOCKS=YES, CR- 1 700S NO SPLIT; END ORBIT SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC1976- FOS/RD ACCUM 4.3 G270H 1 340S PAR WITH 5 SEPAR Comments: COORD PARALLEL WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC1976-SE WFPC2 IMAGE WFALL F673N CLOCKS=YES, CR- 1 700S NO SPLIT SAME POS AS 1 SEQ 7,9,11,13 NON- SPLIT=NO INT ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC1976- FOS/RD ACCUM 4.3 G270H 1 400S PAR WITH 7 SEPAR Comments: COORD PARALLEL WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC1976-SE WFPC2 IMAGE WFALL F673N CLOCKS=YES, CR- 1 700S NO SPLIT SAME POS AS 1 SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC1976- FOS/RD ACCUM 4.3 G270H 1 340S PAR WITH 9 SEPAR Comments: COORD PARALLEL WITH 9 ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC1976-SE WFPC2 IMAGE WFALL F673N CLOCKS=YES, CR- 1 700S NO SPLIT SAME POS AS 1 SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 12 NGC1976- FOS/RD ACCUM 4.3 G270H 1 340S PAR WITH 11 SEPAR Comments: COORD PARALLEL WITH 11 ------------------------------------------------------------------------------------------------------------------------------------ 13 NGC1976-SE WFPC2 IMAGE WFALL F791W CLOCKS=YES, CR- 2 100S NO SPLIT SAME POS AS 1 SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 5976( 8) - 11/22/95 13:40 - [ 5] Visit: 02 Visit Requirements: ORIENT 270.8D TO 272.80D 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 ------------------------------------------------------------------------------------------------------------------------------------ 14 NGC1976-NW WFPC2 IMAGE WFALL F631N CLOCKS=NO, CR- 1 600S NO SPLIT; SEQ 14,16,18 NON-INT SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 15 NGC1976- FOS/RD ACCUM 4.3 G270H 1 400S PAR WITH 14 NWPAR Comments: COORD PARALLEL WITH 14 ------------------------------------------------------------------------------------------------------------------------------------ 16 NGC1976-NW WFPC2 IMAGE WFALL F631N CLOCKS=NO, CR- 1 600S NO SPLIT SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 17 NGC1976- FOS/RD ACCUM 4.3 G270H 1 340S PAR WITH 16 NWPAR Comments: COORD PARALLEL WITH 16 ------------------------------------------------------------------------------------------------------------------------------------ 18 NGC1976-NW WFPC2 IMAGE WFALL F631N CLOCKS=NO, CR- 1 600S NO SPLIT; END ORBIT SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 19 NGC1976- FOS/RD ACCUM 4.3 G270H 1 340S PAR WITH 18 NWPAR Comments: COORD PARALLEL WITH 18 ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC1976-NW WFPC2 IMAGE WFALL F673N CLOCKS=NO, CR- 1 600S NO SPLIT SAME POS AS 14 SEQ 20,22,24,26 NON SPLIT=NO -INT ------------------------------------------------------------------------------------------------------------------------------------ 21 NGC1976- FOS/RD ACCUM 4.3 G270H 1 400S PAR WITH 20 NWPAR Comments: COORD PARALLEL WITH 20 ------------------------------------------------------------------------------------------------------------------------------------ 22 NGC1976-NW WFPC2 IMAGE WFALL F673N CLOCKS=NO, CR- 1 600S NO SPLIT SAME POS AS 14 SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 23 NGC1976- FOS/RD ACCUM 4.3 G270H 1 340S PAR WITH 22 NWPAR Comments: COORD PARALLEL WITH 22 ------------------------------------------------------------------------------------------------------------------------------------ 24 NGC1976-NW WFPC2 IMAGE WFALL F673N CLOCKS=NO, CR- 1 600S NO SPLIT SAME POS AS 14 SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 25 NGC1976- FOS/RD ACCUM 4.3 G270H 1 340S PAR WITH 24 NWPAR Comments: COORD PARALLEL WITH 24 ------------------------------------------------------------------------------------------------------------------------------------ 26 NGC1976-NW WFPC2 IMAGE WFALL F791W CLOCKS=NO, CR- 2 100S NO SPLIT SAME POS AS 14 SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 5976( 8) - 11/22/95 13:40 - [ 6] Summary Form for Proposal 5976 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 FOS/RD ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CLOCKS=YES CR-SPLIT=NO CLOCKS=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Interstellar Medium ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 314.0D TO 316.0D NO SPLIT; SEQ 1,3,5 NON-INT PAR WITH 1 NO SPLIT PAR WITH 3 NO SPLIT; END ORBIT PAR WITH 5 NO SPLIT SAME POS AS 1 SEQ 7,9,11,13 NON-INT PAR WITH 7 NO SPLIT SAME POS AS 1 PAR WITH 9 PAR WITH 11 ORIENT 270.8D TO 272.80D NO SPLIT; SEQ 14,16,18 NON-INT PAR WITH 14 PAR WITH 16 PAR WITH 18 NO SPLIT SAME POS AS 14 SEQ 20,22,24,26 NON-INT PAR WITH 20 NO SPLIT SAME POS AS 14 PAR WITH 22 PAR WITH 24 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F631N G270H F673N F791W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC1976-SE NGC1976-SEPAR NGC1976-NW NGC1976-NWPAR ------------------------------------------------------------------------------------------------------------------------------------