6054( 5) - 01/25/96 10:57 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6054 Version: 5 Check-in Date: 25-Jan-1996 10:50:15 1.Proposal Title: FGS Observations of a Halo Population Binary ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Cool Stars GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Wayne Osborn Central Michigan University CoI: Richard Miller Central Michigan University N CoI: John L. Hershey Computer Sciences Corporation Y ------------------------------------------------------------------------------------ 6. Abstract No direct determinations of masses for stars of the halo population currently exist. A number of halo spectroscopic binaries have recently been identified, and the system HD20039 appears to be resolvable with the HST. TRANSfer mode observations with the FGS will be used to obtain separations, position angles and magnitude differences at six orbital phases. When these data are combined with the spectroscopic elements, the orbit can be completely specified and the masses of the components determined. ------------------------------------------------------------------------------------ 6054( 5) - 01/25/96 10:57 - [ 2] Observations Description ------------------------ The target will be observed six times: at the predicted time of velocity maximum and minimum and at an orbital phase 0.1 cycles before and after the extrema times. Each observation will consist of two separate sets of 21 TRANS- mode scans of the target (1260 seconds total observation time). This will ensure an excellent S/N for each set and also, by intercomparing the results from the two sets, allow the uncertainties in the derived parameters for an epoch to be determined. All observations will be at the same location in the ``pickle.'' Each observation will require a single orbit. We have not requested observations of the single star Upgren-69 that is used to calibrate the S- curves upon which the data reduction depend. We assume that this object will continue to be regularly observed by the Astrometry Science Team as part of the Institute's FGS calibration programs. Real Time Justification ----------------------- These are time-critical observations. They are to be carried out at the specified orbital phases +/-0.03 as predicted by the ephemeris. The permitted deviation from optimal phase gives a window for each observation of one week. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: John Hershey*STScI*3700 San Martin Drive*Baltimore, MD 21218 Ship Via: UPS Email: hershey@stsci.edu , ------------------------------------------------------------------------------------ 6054( 5) - 01/25/96 10:57 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD20039 STAR,F3-F9 RA=03H 18M 38.422S +/- 0.1", J2000 V= -5.0 V = 8.89+/-0.02 DEC=+72D 16' 30.55" +/- 0.1" B-V = 0.75+/-0.02 E(B-V) = 0.0 TYPE=F8 Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) J2000 0.046 -0.254 0.025 6054( 5) - 01/25/96 10:57 - [ 4] Visit: 01 Visit Requirements: PERIOD 114.377D AND ZERO-PHASE JD2446664.3 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 HD20039 FGS TRANS 3 F583W SCANS=21,STEP- 1 630S RT ANALYSIS PHASE 0.83 TO 0.89 SEQuence 1-2 SIZE=1.0 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 HD20039 FGS TRANS 3 F583W SCANS=21,STEP- 1 630S RT ANALYSIS SIZE=1.0 ------------------------------------------------------------------------------------------------------------------------------------ 6054( 5) - 01/25/96 10:57 - [ 5] Visit: 02 Visit Requirements: PERIOD 114.377D AND ZERO-PHASE JD2446664.3 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 HD20039 FGS TRANS 3 F583W SCANS=21,STEP- 1 630S PHASE 0.93 TO 0.99 SEQ 1-2 NON-INT SIZE=1.0 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD20039 FGS TRANS 3 F583W SCANS=21,STEP- 1 630S SIZE=1.0 ------------------------------------------------------------------------------------------------------------------------------------ 6054( 5) - 01/25/96 10:57 - [ 6] Visit: 03 Visit Requirements: PERIOD 114.377D AND ZERO-PHASE JD2446664.3 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 HD20039 FGS TRANS 3 F583W SCANS=21 1 630S PHASE 0.03 TO 0.09 SEQ 1-2 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 HD20039 FGS TRANS 3 F583W SCANS=21 1 630S ------------------------------------------------------------------------------------------------------------------------------------ 6054( 5) - 01/25/96 10:57 - [ 7] Visit: 04 Visit Requirements: PERIOD 114.377D AND ZERO-PHASE JD2446664.3 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 HD20039 FGS TRANS 3 F583W SCANS=21,STEP- 1 630S PHASE 0.26 TO 0.32 SEQ 1-2 NON-INT SIZE=1.0 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD20039 FGS TRANS 3 F583W SCANS=21,STEP- 1 630S SIZE=1.0 ------------------------------------------------------------------------------------------------------------------------------------ 6054( 5) - 01/25/96 10:57 - [ 8] Visit: 05 Visit Requirements: PERIOD 114.377D AND ZERO-PHASE JD2446664.3 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 HD20039 FGS TRANS 3 F583W SCANS=21,STEP- 1 630S PHASE 0.36 TO 0.42 SEQ 1-2 NON-INT SIZE=1.0 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD20039 FGS TRANS 3 F583W SCANS=21,STEP- 1 630S SIZE=1.0 ------------------------------------------------------------------------------------------------------------------------------------ 6054( 5) - 01/25/96 10:57 - [ 9] Visit: 06 Visit Requirements: PERIOD 114.377D AND ZERO-PHASE JD2446664.3 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 HD20039 FGS TRANS 3 F583W SCANS=21,STEP- 1 630S PHASE 0.46 TO 0.52 SEQ 1-2 NON-INT SIZE=1.0 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD20039 FGS TRANS 3 F583W SCANS=21,STEP- 1 630S SIZE=1.0 ------------------------------------------------------------------------------------------------------------------------------------ 6054( 5) - 01/25/96 10:57 - [ 10] Summary Form for Proposal 6054 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FGS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes TRANS ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SCANS=21 STEP-SIZE=1.0 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Cool Stars ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PERIOD 114.377D AND ZERO-PHASE JD2446664.3 RT ANALYSIS PHASE 0.83 TO 0.89 SEQuence 1-2 NON-INT RT ANALYSIS PHASE 0.93 TO 0.99 SEQ 1-2 NON-INT PHASE 0.03 TO 0.09 SEQ 1-2 NON-INT PHASE 0.26 TO 0.32 SEQ 1-2 NON-INT PHASE 0.36 TO 0.42 SEQ 1-2 NON-INT PHASE 0.46 TO 0.52 SEQ 1-2 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F583W ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD20039 ------------------------------------------------------------------------------------------------------------------------------------