8121( 4) - 02/16/99 09:49 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 8121 Version: 4 Check-in Date: 16-Feb-1999 09:48:38 1.Proposal Title: Proper Motions and Variability of HH Objects Near the Orion Nebula ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 8 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: C. O'Dell Rice University CoI: Dr. Michael G. Burton University of New South Wales N CoI: Dr. Patrick M. Hartigan Rice University N CoI: Dr. John C. Raymond Center for Astrophysics N ------------------------------------------------------------------------------------ 5. Abstract The Orion nebula possesses at least three systems of HH objects, each with very different characteristics. No other source shows such a variety of outflow phenomena, and we seek to understand why this is so. An essential parameter in understanding these systems and the individual shocks is their spatial motions. A recent groundbased Fabry-Perot study has provided radial velocities for all of the brightest members, but proper motion information is uncertain and available for only a few. The existence of earlier WFPC2 images presents an opportunity to produce accurate proper motions through repeating those observations in Cycle 8. The proposed observations will clarify how shocks sweep up material in the dense H II and Photodissociation Regions, and pinpoint locations of photometric variability within the shocked cooling zones. The timing for this is optimal since the sample of current proper motions indicates that the 4.7-6.0 year time interval will allow accurate results; the results should be obvious and unambiguous. By rotating the field for one of the pointings we'll be able to obtain the first HST images in O I and S II in one of the richest regions of the nebula. The product of this investigation will be proper motions and temporal variability for all of the HH objects in the region, and an O I and S II survey of an unstudied region. ------------------------------------------------------------------------------------ 8121( 4) - 02/16/99 09:49 - [ 2] Observations Description ------------------------ Our imaging observations will be essentially identical at each of the pointings. The exposure times have been determined by the signals obtained in the first epoch observations, which we are duplicating. For the North and SE fields of view (FOV) one orbit will be used for obtaining pairs of observations in the F502N, F547M, F656N, and F658N filters, while the second and third orbits will be used for multiple F 631N and F673N images, thus allowing adequate cosmic ray subtraction. The greater brightness of the Central FOV will allow covering all filters in two orbits. Dithering of the images will not be done as the small improvements in spatial resolution come at the price of exposure time. The exception to this will be for the SE FOV where we have rotated by 180degrees\ from the original exposure in order to cover a missing gap in the O I and S II mapping of the nebula. In this case we will dither, then drizzle the results. We'll then drizzle the PC original images too, thus allowing the comparison of images which have had the geometric distortions of the camera removed. We have two active groundbased programs that support these observations. In addition to the study of all of these regions in HAlpha, O III, and S II which has already been published (O'Dell et al. 1997, AJ, 114, 2016), we obtained similar observations with the "Rutgers" Fabry-Perot system on the CTIO 1.5-m in the second S II doublet line and H Beta. This body of material will become part of the data base used in the analysis of the new HST observations. An additional set of data is formed by the Keck-I HIRES observations made of the "E-W Jet" region. This region was mapped at multiple slit settings displaced by the seeing size and extending over 50"\ along the area of this feature. We will seek Keck, CTIO, or KPNO time to obtain a similar set of spectra of the northernmost HH objects since such data is an important component in the analysis of the motions. We already have good spectral data on the brightess HH objects obtained with the KPNO Coude Feed system; but, the spatial resolution of these permits analysis of the HH objects as a whole and not in the component parts of the shocks. Co-I Burton is continuing his program of AAT imaging in the infrared emission of H_2, BrGamma, Fe II, and He I in the northern fingers, some of the first epoch observations going back to 1992. Proper motions from 3-12 arcsec/century have been measured for individual HH objects through their Fe II 1.64Mum line and in the trailing wakes emitting in H_2 2.12 Mum. Our team, which includes experienced theoreticians, optical observers (ground and HST), and an IR observer is well composed to address and hopefully solve these problems. We are the core of a team that has developed the subject of the Orion Nebula HH objects (O'Dell et al. 1997a, b; Allen &\ Burton 1993; Tedds, et al. 1998) and are in an excellent position to carry out the data analysis and interpretation in a rapid fashion. Since the three pointings requested address three different sets of HH objects, it has to be allowed that one could carry out only a part of this program with less than the eight orbits requested. The time requested is the minimum necessary to carry out this program as formulated, longer exposures would greatly enhance the program. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 8121( 4) - 02/16/99 09:49 - [ 3] Data Distribution Paper Products: YES Media: ELECTRONIC Blocking Factor: 10 Ship To: PI_Address Ship Via: Email: ------------------------------------------------------------------------------------ 8121( 4) - 02/16/99 09:49 - [ 4] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC1976-NW ISM, HII REGION, HERBIG RA = 5H 35M 13.77S +/- 0.01S, 2000 SURF-LINE(6563)=1.1+/-0.1e-10 -HARO OBJECT, EMISSION DEC = -05D 21' 47.14" +/- 0.1" LINE NEBULA Comments: Surface brightness given is for the entire line. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 2 NGC1976-SE ISM, HII REGION, HERBIG RA=5H 35M 19.39S +/- 0.1S, DEC=- 2000 SURF-LINE(6563)=1.1+/-0.1e-10 -HARO OBJECT, EMISSION 05D 24' 15.0" +/-0.1" LINE NEBULA Comments: Surface brightness given is for the entire line. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 8121( 4) - 02/16/99 09:49 - [ 5] Visit: 01 Visit Priority: 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 ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC1976-NW WFPC2 IMAGE WFALL F656N CR-SPLIT=NO 3 260 S ------------------------------------------------------------------------------------------------------------------------------------ 12 NGC1976-NW WFPC2 IMAGE WFALL F502N CR-SPLIT=NO 3 260 S ------------------------------------------------------------------------------------------------------------------------------------ 13 NGC1976-NW WFPC2 IMAGE WFALL F658N CR-SPLIT=NO 3 500 S ------------------------------------------------------------------------------------------------------------------------------------ 14 NGC1976-NW WFPC2 IMAGE WFALL F547M CR-SPLIT=NO 3 50 S ------------------------------------------------------------------------------------------------------------------------------------ 15 NGC1976-NW WFPC2 IMAGE WFALL F673N CR-SPLIT=NO 3 600 S ------------------------------------------------------------------------------------------------------------------------------------ 16 NGC1976-NW WFPC2 IMAGE WFALL F631N CR-SPLIT=NO 3 660 S ------------------------------------------------------------------------------------------------------------------------------------ 8121( 4) - 02/16/99 09:49 - [ 6] Visit: 02 Visit Priority: Visit Requirements: ORIENT 99D to 101D 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 ------------------------------------------------------------------------------------------------------------------------------------ 21 NGC1976-SE WFPC2 IMAGE WFALL F656N CR-SPLIT=NO 3 260 S ------------------------------------------------------------------------------------------------------------------------------------ 22 NGC1976-SE WFPC2 IMAGE WFALL F502N CR-SPLIT=NO 3 260 S ------------------------------------------------------------------------------------------------------------------------------------ 23 NGC1976-SE WFPC2 IMAGE WFALL F658N CR-SPLIT=NO 3 500 S ------------------------------------------------------------------------------------------------------------------------------------ 24 NGC1976-SE WFPC2 IMAGE WFALL F547M CR-SPLIT=NO 3 50 S ------------------------------------------------------------------------------------------------------------------------------------ 25 NGC1976-SE WFPC2 IMAGE WFALL F673N CR-SPLIT=NO 3 600 S ------------------------------------------------------------------------------------------------------------------------------------ 26 NGC1976-SE WFPC2 IMAGE WFALL F631N CR-SPLIT=NO 3 660 S ------------------------------------------------------------------------------------------------------------------------------------ 8121( 4) - 02/16/99 09:49 - [ 7] Summary Form for Proposal 8121 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFALL ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 270.8D TO 272.80D ORIENT 99D to 101D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F656N F502N F658N F547M F673N F631N ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC1976-NW NGC1976-SE ------------------------------------------------------------------------------------------------------------------------------------