6486( 22) - 04/17/97 15:32 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6486 Version: 22 Check-in Date: 17-Apr-1997 14:34:10 1.Proposal Title: Orbits of Pre-Main Sequence Binaries ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle COOL STARS GO 6 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: MICHAL SIMON State University of New York, Stony Brook CoI: Sherie Holfeltz Space Telescope Science Institute N CoI: Laurence Taff Johns Hopkins University N ------------------------------------------------------------------------------------ 6. Abstract Our goal is to measure the masses of low mass pre-main sequence stars dynamically. This is important because there are still no low mass young stars with reliably known masses. We have begun this program by using the FGS to map the orbits of close separation young star binaries in Taurus. In order to measure the orbits of the systems with the smallest separations, and hence those uniquely observable by the HST and having the shortest periods, we propose to continue the observations in Taurus and also to extend the program to 3 systems in Ophiuchus. ------------------------------------------------------------------------------------ 6486( 22) - 04/17/97 15:32 - [ 2] Observations Description ------------------------ This program requires the FGS operating in Transfer Function Mode. We will use the PUPIL filter to take advantage of the red spectra of the stars and the S20 response of the FGS photomultipliers, and the 2/3 aperture stop to achieve the best signal-to-noise ratio. Since the binaries are expected to have orbital periods of a few years, we request two FGS observations per year, at the greatest interval set by guide star availability (see next section). We calculate the exposure time to reach adequate S/N for a V=17 mag secondary and need an FGS scan length of 1.5'' per axis to be certain to include the entire system. To satisfy these constraints we require 10 Transfer Function mode scans at 180 seconds/scan. Thus each observation will require an exposure of 1800 sec. Previous experience with the Taurus objects indicates that each observation can be fitted into one orbit conveniently. Real Time Justification ----------------------- Our targets are associated with the Taurus and Ophiuchus dark clouds. Guide star availability could therefore be a problem. Careful analysis of the sources in Taurus by Denise Taylor has already identified suitable times for their observation. We will work with her to identify similar windows of observability for the three new sources in Ophiuchus. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: *Dr. Michal Simon*Astronomy Program, ESS Dept.*SUNY*Stony Brook, NY 11794- 2100 Ship Via: UPS (2-day) Email: ------------------------------------------------------------------------------------ 6486( 22) - 04/17/97 15:32 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 DF-TAU STAR, T Tauri Star RA=04H 27M 2.80S +/- 0.1S, J2000 V = 12.6+/-1.0 DEC=25D 42' 23.1"+/- 1.0", PLATE B-V = 0.9+/-0.2 -ID=000L Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1983.0 0.0 -0.010 0.0 2 ZZ-TAU STAR, T Tauri Star RA=4H 30M 51.39S +/- 0.1S, J2000 V = 14.5+/-1.0 DEC=24D 42' 22.5" +/- 1.0", B-V = 1.5+/-0.2 PLATE-ID=000L Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1983.0 0.0007 -0.014 0.0 3 HV-TAU STAR, T Tauri Star RA= 4H 38M 35.27S +/- 0.1S, DEC= J2000 V = 14.5+/-1.0 26D 10' 38.9" +/-1.0", PLATE- ID=000L Comments: B-V=1.7 +/- 0.2 Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1983.0 0.0004 -0.031 0.0 4 ELIAS-12 STAR, T Tauri Star RA=4H 33M 6.62S +/- 0.1S, DEC= J2000 V = 12.1+/-1.0 24D 9' 55.2" +/- 1.0", PLATE- B-V = 1.3 ID=000L Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1983.0 0.0 0.0 0.0 5 V853-OPH STAR, T Tauri Star RA=16H 28M 45.29S +/-0.1S, DEC=- J2000 V = 14.2+/-0.5 24D 28' 18.4" +/-1.0", PLATE- B-V = 1.1 ID=02J6 Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1986.038 0.0 0.0 0.0 6 ROX-42B STAR, T Tauri Star RA=16H 31M 15.0S +/-0.1S, DEC=- J2000 V = 15.0+/-0.5 24D 32' 42.1" +/-1.0", PLATE- ID=02J6 7 S1 STAR, T Tauri Star RA=16H 26M 34.177S +/-0.2S, DEC= 2000 V = 17+/-0.5 -24D 23' 27.0" +/-4.0" B-V = 3+/-1 Comments: TARGET IS IN DARK CLOUD REGION SO GUIDE STAR AVAILABILITY MAY BE A PROBLEM TARGET IS VERY RED, V=17, R=14, I=11 TARGET IS ONLY OBJECT VISIBLE ON DIGITIZED SKY SURVEY WITHIN 2' RADIUS 6486( 22) - 04/17/97 15:32 - [ 4] Visit: 01 Visit Requirements: BETWEEN 1-OCT-1997 AND 30-NOV-1997 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 DF-TAU FGS TRANS PRIME PUPIL STEP-SIZE=0.3,SCANS=14 1 2100 S ------------------------------------------------------------------------------------------------------------------------------------ 6486( 22) - 04/17/97 15:32 - [ 5] Visit: 02 Visit Requirements: BETWEEN 1-JAN-1997 AND 30-MAR-1997 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 DF-TAU FGS TRANS PRIME PUPIL STEP-SIZE=0.3,SCANS=14 1 2100 S ------------------------------------------------------------------------------------------------------------------------------------ 6486( 22) - 04/17/97 15:32 - [ 6] Visit: 03 Visit Requirements: BETWEEN 15-DEC-1996 AND 15-JAN-1997 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 ZZ-TAU FGS TRANS PRIME PUPIL STEP-SIZE=0.3,SCANS=14 1 2100 S ------------------------------------------------------------------------------------------------------------------------------------ 6486( 22) - 04/17/97 15:32 - [ 7] Visit: 04 Visit Requirements: BETWEEN 1-SEP-1997 AND 30-SEP-1997 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 ZZ-TAU FGS TRANS PRIME PUPIL STEP-SIZE=0.3,SCANS=14 1 2100 S ------------------------------------------------------------------------------------------------------------------------------------ 6486( 22) - 04/17/97 15:32 - [ 8] Visit: 05 Visit Requirements: BEFORE 15-SEP-1996 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 HV-TAU FGS TRANS PRIME PUPIL STEP-SIZE=0.3,SCANS=14 1 2100 S ------------------------------------------------------------------------------------------------------------------------------------ 6486( 22) - 04/17/97 15:32 - [ 9] Visit: 06 Visit Requirements: AFTER 15-OCT-1996 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 HV-TAU FGS TRANS PRIME PUPIL STEP-SIZE=0.3,SCANS=14 1 2100 S ------------------------------------------------------------------------------------------------------------------------------------ 6486( 22) - 04/17/97 15:32 - [ 10] Visit: 07 Visit Requirements: BETWEEN 24-JUL-1997 AND 7-AUG-1997 ORIENT 218D TO 258D 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 ELIAS-12 FGS TRANS PRIME PUPIL STEP-SIZE=0.3,SCANS=14 1 2100 S ------------------------------------------------------------------------------------------------------------------------------------ 6486( 22) - 04/17/97 15:32 - [ 11] Visit: 08 Visit Requirements: BETWEEN 15-NOV-1997 AND 29-NOV-1997 ORIENT 218D TO 258D 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 ELIAS-12 FGS TRANS PRIME PUPIL STEP-SIZE=0.3,SCANS=14 1 2100 S ------------------------------------------------------------------------------------------------------------------------------------ 6486( 22) - 04/17/97 15:32 - [ 12] Visit: 09 Visit Requirements: On Hold Comments: Additional Comments: SEPARATE VISITS 9 AND 10 BY LONGEST TIME INTERVAL POSSIBLE Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 V853-OPH FGS TRANS PRIME PUPIL STEP-SIZE=0.3,SCANS=14 1 2100 S ------------------------------------------------------------------------------------------------------------------------------------ 6486( 22) - 04/17/97 15:32 - [ 13] Visit: 10 Visit Requirements: AFTER 09 BY 160D TO 210D On Hold Comments: Additional Comments: SEPARATE VISITS 9 AND 10 BY LONGEST TIME INTERVAL POSSIBLE Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 V853-OPH FGS TRANS PRIME PUPIL STEP-SIZE=0.3,SCANS=14 1 2100 S ------------------------------------------------------------------------------------------------------------------------------------ 6486( 22) - 04/17/97 15:32 - [ 14] Visit: 11 Visit Requirements: On Hold Comments: Additional Comments: SEPARATE VISITS 11 AND 12 BY LONGEST TIME INTERVAL POSSIBLE. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ROX-42B FGS TRANS PRIME PUPIL STEP-SIZE=0.3,SCANS=14, 1 2100 S ACQ-DIST=2.5 ------------------------------------------------------------------------------------------------------------------------------------ 6486( 22) - 04/17/97 15:32 - [ 15] Visit: 12 Visit Requirements: AFTER 11 BY 125D TO 150D On Hold Comments: Additional Comments: SEPARATE VISITS 11 AND 12 BY LONGEST TIME INTERVAL POSSIBLE. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ROX-42B FGS TRANS PRIME PUPIL STEP-SIZE=0.3,SCANS=14, 1 2100 S ACQ-DIST=2.5 ------------------------------------------------------------------------------------------------------------------------------------ 6486( 22) - 04/17/97 15:32 - [ 16] Visit: 13 Visit Requirements: On Hold Comments: Additional Comments: SEPARATE VISITS 13 AND 14 BY LONGEST TIME INTERVAL POSSIBLE. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 S1 FGS TRANS PRIME PUPIL STEP-SIZE=0.3,SCANS=14 1 2100 S ------------------------------------------------------------------------------------------------------------------------------------ 6486( 22) - 04/17/97 15:32 - [ 17] Visit: 14 Visit Requirements: AFTER 13 BY 100D TO 120D On Hold Comments: Additional Comments: SEPARATE VISITS 13 AND 14 BY LONGEST TIME INTERVAL POSSIBLE. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 S1 FGS TRANS PRIME PUPIL STEP-SIZE=0.3,SCANS=14 1 2100 S ------------------------------------------------------------------------------------------------------------------------------------ 6486( 22) - 04/17/97 15:32 - [ 18] Summary Form for Proposal 6486 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FGS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes TRANS ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters STEP-SIZE=0.3 SCANS=14 ACQ-DIST=2.5 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category COOL STARS ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 1-OCT-1997 AND 30-NOV-1997 BETWEEN 1-JAN-1997 AND 30-MAR-1997 BETWEEN 15-DEC-1996 AND 15-JAN-1997 BETWEEN 1-SEP-1997 AND 30-SEP-1997 BEFORE 15-SEP-1996 AFTER 15-OCT-1996 BETWEEN 24-JUL-1997 AND 7-AUG-1997 ORIENT 218D TO 258D BETWEEN 15-NOV-1997 AND 29-NOV-1997 ORIENT 218D TO 258D AFTER 09 BY 160D TO 210D AFTER 11 BY 125D TO 150D AFTER 13 BY 100D TO 120D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements PUPIL ------------------------------------------------------------------------------------------------------------------------------------ Target Names DF-TAU ZZ-TAU HV-TAU ELIAS-12 V853-OPH ROX-42B S1 ------------------------------------------------------------------------------------------------------------------------------------