6411( 6) - 09/11/96 14:08 - [ 0] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6411 Version: 6 Check-in Date: 11-Sep-1996 13:32:10 1.Proposal Title: Velocity field and small scale structure in the L1551 IRS5 jet ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle BINARIES AND STAR FOR GO 6 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Dr. Malcolm Fridlund EUROPEAN SPACE AGENCY-ESTEC CoI: Dr. Rene Liseau Stockholm Observatory N CoI: Erik Gullbring Stockholm Observatory N ------------------------------------------------------------------------------------ 6. Abstract This is a continuation proposal from cycle 5. Our aim is to image the optical jet emanating from the young stellar object L1551 IRS5 over a period of three cycles. Using two narrow band filters sensitive to high- and low-excitation shocks respectively, we aim to study the time evolution of small scale structures within this object. Ground based observations have already detected the time scale for evolution of this object. HST is going to provide the level of detail necessary for a direct comparison with (existing) hydrodynamical models. Our data will resolve the smallest features observed (optically) so far in an astrophysical jet, and also detect their time evolution. This proposal received already time in cycle 5 with 4 orbits. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will obtain 2 deep images in each of HAlpha and SII in cycle 6. One orbit will be dedicated to each of the filters. Although relative astrometry of the movements of the knots in the jet is the main purpose of this proposal, the orientation of the HST sould be such that the few reference stars available within the field of view fall onto the wide field part of the camera thus allowing also absolute astrometry. Real Time Justification ----------------------- Ground based spectroscopic observations were carried out at the Nordic Optical telescope, La Palma in mid September 1995. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 6411( 6) - 09/11/96 14:08 - [ 1] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 L1551-IRS5 ISM,HERBIG-HARO RA=4H 28M 40.23S +/- 0.02S, 1950.0 F-LINE(6563)=3.3e-14 OBJECT,BIPOLAR OUTFLOW, DEC=+18D 1' 42.23" +/- 0.7" W-LINE(6563)=7+/-3 JET F-LINE(6716)=1.0e-14 W-LINE(6716)=7+/-3 F-LINE(6731)=1.9e-14 W-LINE(6731)=7+/-3 Comments: Total fluxes for 10 arcsec by 2 arcsec part of jet Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1982.11 0.0 0.0 0.0 6411( 6) - 09/11/96 14:08 - [ 2] Visit: 01 Visit Requirements: PCS MODE Fine ORIENTation 40D TO 90D AFTER 1-OCT-96 On Hold Comments: Additional Comments: The visit should be carried out more than 7 months after the cycle 5 observation, in order to show the proper motions in the jet. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 L1551-IRS5 WFPC2 IMAGE PC1 F673N 1 2600 S ------------------------------------------------------------------------------------------------------------------------------------ 2 L1551-IRS5 WFPC2 IMAGE PC1 F656N 1 2600 S SAME POSition AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 6411( 6) - 09/11/96 14:08 - [ 3] Summary Form for Proposal 6411 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category BINARIES AND STAR FORMATION ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PCS MODE Fine ORIENTation 40D TO 90D AFTER 1-OCT-96 SAME POSition AS 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F673N F656N ------------------------------------------------------------------------------------------------------------------------------------ Target Names L1551-IRS5 ------------------------------------------------------------------------------------------------------------------------------------