8289( 7) - 01/03/00 10:23 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 8289 Version: 7 Check-in Date: 03-Jan-2000 10:22:56 1.Proposal Title: DEVELOPMENT AND EVOLUTION OF YSO OUTFLOWS AND JETS ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 8 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Chris Burrows Space Telescope Science Institute CoI: John Krist Space Telescope Science Institute Y CoI: Jeff Hester Arizona State University N CoI: Karl Stapelfeldt Jet Propulsion Laboratory N CoI: Alan Watson UNAM N ------------------------------------------------------------------------------------ 5. Abstract XZ Tauri, HL Tauri, and HH 30 are three young stars which can be observed simultaneously in a single WFPC2 pointing. Broad-band HST imaging has revealed that the XZ Tauri binary is the source of an elongated bubble of emission nebulosity nearly 5" long. In new images of these objects obtained in March 1998, we discovered that the XZ Tau bubble had expanded significantly and had become markedly limb- brightened since 1995. This behavior suggests that we are witnessing, for the first time, the earliest stages of development of a Herbig-Haro bowshock, perhaps the initial formation of its post-shock cooling zone. We propose to test this hypothesis with emission line imaging and temporal monitoring of the bubble's size and brightness. Simultaneously with the XZ Tau study, we will observe the jets and reflection nebulosities of HH 30 and HL Tauri. Monitoring of HH 30 is particularly important, as our 1998 imaging also revealed that a very large reflected light asymmetry has developed in this prototype young stellar object accretion disk system. ------------------------------------------------------------------------------------ 8289( 7) - 01/03/00 10:23 - [ 2] Observations Description ------------------------ A set of three visits to the XZ Tau - HH 30 region are planned, spaced annually with the same position and orientation as used for the previous observations (XZ Tau and HL Tau on the PC, HH 30 in the corner of WF2, LkHa 358 on WF3). Each visit will be four orbits, each in a different filter, with long (2200s) and short (12-180s) exposures in each filter. The short exposures are used to determine the positions and brightnesses of the stars, which are saturated in the longer exposures. The first orbit consists of F656N exposures for Ha imaging. The second orbit is in F673N ([S II]). The third orbit is in F675W for deep imaging of the XZ Tau bubble, jet proper motion measurements in HH 30, and HH 30 disk and HL Tau nebula variability analysis. The fourth orbit is in F814W which will serve as a continuum measurement. It will allow us to discriminate between emission and reflection nebulousity. The narrowband images will also allow us to view the bubble closer to the star than before, because the nebula- to-star contrast ratio will be much higher. If we assume that all of the emission seen in our previous R-band images is due to Ha, then we would expect 12-20 DN per pixel in F656N. Real Time Justification ----------------------- None Calibration Justification ------------------------- None Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Paper Products: Media: ELECTRONIC Blocking Factor: 10 Ship To: PI_Address Ship Via: Email: ------------------------------------------------------------------------------------ 8289( 7) - 01/03/00 10:23 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 XZ-TAU- STAR, T Tauri Star RA=4H 31M 39.00S +/- 0.1S, J2000 R = 13.0 OFFSET DEC=18D 13' 58.00" +/- 0.1" 8289( 7) - 01/03/00 10:23 - [ 4] Visit: 01 Visit Priority: Visit Requirements: ORIENT 82D TO 84D On Hold Comments: Additional Comments: Please orient as close to 83D as possible Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 XZ-TAU-OFFS WFPC2 IMAGE PC1-FIX F656N CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 1 120 S GS ACQ SCENARIO SINGLE ET Comments: For measuring binary positions and photometry ------------------------------------------------------------------------------------------------------------------------------------ 11 XZ-TAU-OFFS WFPC2 IMAGE PC1-FIX F656N CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=0.5 1 2000 S ET ,CR-TOLERANCE=0.0 Comments: STARS WILL BE SATURATED ------------------------------------------------------------------------------------------------------------------------------------ 12 XZ-TAU-OFFS WFPC2 IMAGE PC1-FIX F673N CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 1 180 S ET Comments: For measuring binary positions and photometry ------------------------------------------------------------------------------------------------------------------------------------ 13 XZ-TAU-OFFS WFPC2 IMAGE PC1-FIX F673N CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=0.5 1 2000 S ET ,CR-TOLERANCE=0.0 Comments: STARS WILL BE SATURATED ------------------------------------------------------------------------------------------------------------------------------------ 14 XZ-TAU-OFFS WFPC2 IMAGE PC1-FIX F675W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 2 6 S ET Comments: For measuring binary positions and photometry ------------------------------------------------------------------------------------------------------------------------------------ 15 XZ-TAU-OFFS WFPC2 IMAGE PC1-FIX F675W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=0.5 1 2000 S ET ,CR-TOLERANCE=0.0 Comments: STARS WILL BE SATURATED ------------------------------------------------------------------------------------------------------------------------------------ 16 XZ-TAU-OFFS WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 2 6 S ET Comments: For measuring binary positions and photometry ------------------------------------------------------------------------------------------------------------------------------------ 17 XZ-TAU-OFFS WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=0.5 1 2000 S ET ,CR-TOLERANCE=0.0 Comments: STARS WILL BE SATURATED ------------------------------------------------------------------------------------------------------------------------------------ 8289( 7) - 01/03/00 10:23 - [ 5] Visit: 02 Visit Priority: Visit Requirements: BEFORE 31-MAR-2000 ORIENT 82D TO 82D On Hold Comments: Additional Comments: ORIENT SPECIFIC TO GET SAME ORIENT AS VISIT 01 AND DATE SET FOR TIMING Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 20 XZ-TAU-OFFS WFPC2 IMAGE PC1-FIX F656N CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 1 120 S GS ACQ SCENARIO SINGLE ET Comments: For measuring binary positions and photometry ------------------------------------------------------------------------------------------------------------------------------------ 21 XZ-TAU-OFFS WFPC2 IMAGE PC1-FIX F656N CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=0.5 1 2000 S ET ,CR-TOLERANCE=0.0 Comments: STARS WILL BE SATURATED ------------------------------------------------------------------------------------------------------------------------------------ 22 XZ-TAU-OFFS WFPC2 IMAGE PC1-FIX F673N CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 1 180 S ET Comments: For measuring binary positions and photometry ------------------------------------------------------------------------------------------------------------------------------------ 23 XZ-TAU-OFFS WFPC2 IMAGE PC1-FIX F673N CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=0.5 1 2000 S ET ,CR-TOLERANCE=0.0 Comments: STARS WILL BE SATURATED ------------------------------------------------------------------------------------------------------------------------------------ 24 XZ-TAU-OFFS WFPC2 IMAGE PC1-FIX F675W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 2 6 S ET Comments: For measuring binary positions and photometry ------------------------------------------------------------------------------------------------------------------------------------ 25 XZ-TAU-OFFS WFPC2 IMAGE PC1-FIX F675W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=0.5 1 2000 S ET ,CR-TOLERANCE=0.0 Comments: STARS WILL BE SATURATED ------------------------------------------------------------------------------------------------------------------------------------ 26 XZ-TAU-OFFS WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 2 6 S ET Comments: For measuring binary positions and photometry ------------------------------------------------------------------------------------------------------------------------------------ 27 XZ-TAU-OFFS WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=0.5 1 2000 S ET ,CR-TOLERANCE=0.0 Comments: STARS WILL BE SATURATED ------------------------------------------------------------------------------------------------------------------------------------ 8289( 7) - 01/03/00 10:23 - [ 6] Summary Form for Proposal 8289 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PC1-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CLOCKS=NO ATD-GAIN=7 CR-SPLIT=NO CR-TOLERANCE=0.0 CR-SPLIT=0.5 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 82D TO 84D GS ACQ SCENARIO SINGLE BEFORE 31-MAR-2000 ORIENT 82D TO 82D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F656N F673N F675W F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names XZ-TAU-OFFSET ------------------------------------------------------------------------------------------------------------------------------------