7486( 12) - 12/18/98 15:30 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 7486 Version: 12 Check-in Date: 18-Dec-1998 15:28:18 1.Proposal Title: Fixing the Mass of the Bright Giant HD 173764 ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 7 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Sid Parsons Space Telescope Science Institute CoI: Otto Franz Lowell Observatory N ------------------------------------------------------------------------------------ 5. Abstract TRANS mode interferometry of HD 173764, at an estimated distance of 150 pc, has resolved the component separation of this G4 II + B9 spectroscopic binary system. With its 832 day period, the binary will be observable over a large range of orbital motion during the next year. The FGS measurements, analyzed with respect to the spectroscopic orbit, will yield the system's inclination, distance, luminosities, and sum of the component masses. Concurrent POS mode astrometry will provide the mass ratio. Since G-type bright giants and supergiants are relatively rare, the primary's mass and luminosity are especially important for comparison with theory for rapid post main sequence evolution. ------------------------------------------------------------------------------------ 7486( 12) - 12/18/98 15:30 - [ 2] Observations Description ------------------------ The three visits in Cycle 7 are designed to provide, in combination with the Cycle 6 observations, a well-defined "visual" orbit and reflex motion for accurate mass sum and mass ratio determinations of the binary prime target HD 173764. All observations will be carried out with FGS-3 and filter F5ND for the prime target and filter F583W for the much fainter reference stars, except for reference star 7-REF which will be observed in both filters to calibrate any possible filter-dependent positional offsets. Each of three visits (each lasting one orbit) will begin with a POS mode observation of the prime target followed by one POS mode observation for each of four reference stars. We then observe the binary in TRANS mode making 18 scans of 25 seconds duration each (1.0 arcsec length per FGS axis). We will then reobserve the prime target in POS mode, followed by one POS mode observation of 7-REF in each of the two filters. We will finally reobserve each of the four other reference stars in POS mode. TRANS-mode data will be reduced and analyzed with the use of algorithms and software developed, tested, and extensively applied at Lowell Observatory by Franz and Wasserman under GTO proposals of the Astrometry Science Team. TRANS scan data are analyzed under the assumption that the transfer function (TF) of a resolvable binary is a linear superposition of two single-star functions. If F(X) is the TF of a single star on the FGS X-axis, a double star will then yield a TF of the form D(X) = A*F(X + Z) + B*F(X + Z + S) + C, where A and B are the fractional intensities and S is the effective separation of the binary components along the FGS X-axis. Z and C are a zeropoint offset and a bias, respectively. An equivalent expression exists in Y. We determine the values of these parameters by least-squares solutions. Appropriate single-star transfer functions of high signal-to-noise ratio serve as templates. The resulting S- values in X and Y yield the binary separation and, by transformation from the FGS X-Y frame to equatorial coordinates, the position angle of the pair. The fractional intensities A and B yield directly the magnitude difference between the binary components. Tests on four visual binaries with very accurately known orbits have shown that FGS in TRANS mode yields both astrometric precision and accuracy of 1 mas from one observation. Derived magnitude differences are accurate to a few percent, although they refer to a very broad bandpass and cannot be easily translated to Delta V. Real Time Justification ----------------------- None. Calibration Justification ------------------------- None. Additional Comments ------------------- ------------------------------------------------------------------------------------ 7486( 12) - 12/18/98 15:30 - [ 3] Data Distribution Paper Products: Media: ELECTRONIC Blocking Factor: 10 Ship To: PI_Address Ship Via: Email: ------------------------------------------------------------------------------------ 7486( 12) - 12/18/98 15:30 - [ 4] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD173764 STAR, G III-I, RA=18H 47M 10.40S +/- .1S, DEC=- J2000 V = 4.22+/-0.03 Composite Spectral Type 04D 44' 51.6" +/- 1" B-V = 1.10+/-0.03 E(B-V) = 0.20+/-0.04 Comments: Star 426 on OGF list 2 HD173764-2- CALIBRATION, RA=281.76945D +/- .0002D, DEC=- J2000 V = 13.01+/-0.2 REF ASTROMETRIC 4.72450D +/- .0002D Comments: Star 180 on OGF list 3 HD173764-3- CALIBRATION, RA=281.86546D +/- .0002D, DEC=- J2000 V = 12.22+/-0.2 REF ASTROMETRIC 4.74021D +/- .0002D Comments: Star 222 on OGF list 4 HD173764-4- CALIBRATION, RA=281.81180D +/- .0002D, DEC=- J2000 V = 13.12+/-0.2 REF ASTROMETRIC 4.71856D +/- .0002D Comments: Star 233 on OGF list 5 HD173764-5- CALIBRATION, RA=281.74026D +/- .0002D, DEC=- J2000 V = 12.71+/-0.2 REF ASTROMETRIC 4.73401D +/- .0002D Comments: Star 333 on OGF list 6 HD173764-6- CALIBRATION, RA=281.83711D +/- .0002D, DEC=- J2000 V = 12.48+/-0.2 REF ASTROMETRIC 4.75820D +/- .0002D Comments: Star 348 on OGF list 7 HD173764-7- CALIBRATION, RA=281.75754D +/- .0002D, DEC=- J2000 V = 11.58+/-0.2 REF ASTROMETRIC 4.74200D +/- .0002D Comments: Star 367 on OGF list 7486( 12) - 12/18/98 15:30 - [ 5] Visit: 01 Visit Priority: Visit Requirements: PCS MODE FINE ORIENT 74D TO 74D BETWEEN 22-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 ------------------------------------------------------------------------------------------------------------------------------------ 10 HD173764 FGS POS 3 F5ND 1 5 S POS TARG 0.0, 0.0 MAX DUR 5 S SEQ 10-135 NON-INT Comments: OBSERVATION MAY BE TRUNCATED TO SATISFY MONITORING SPACING REQUIREMENTS ------------------------------------------------------------------------------------------------------------------------------------ 20 HD173764-5- FGS POS 3 F583W 1 15 S MAX DUR 15 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 30 HD173764-2- FGS POS 3 F583W 1 20 S MAX DUR 20 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 40 HD173764-3- FGS POS 3 F583W 1 10 S MAX DUR 10 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 50 HD173764-6- FGS POS 3 F583W 1 15 S MAX DUR 15 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 55 HD173764 FGS POS 3 F5ND 1 5 S MAX DUR 5 S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 60 HD173764 FGS TRANS 3 F5ND SCANS=26,STEP-SIZE=1 1 650 S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 70 HD173764 FGS POS 3 F5ND 1 10 S MAX DUR 10 S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 90 HD173764-7- FGS POS 3 F583W 1 10 S MAX DUR 10 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 100 HD173764-2- FGS POS 3 F583W 1 20 S MAX DUR 20 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 110 HD173764-3- FGS POS 3 F583W 1 10 S MAX DUR 10 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 120 HD173764-6- FGS POS 3 F583W 1 15 S MAX DUR 15 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 130 HD173764-5- FGS POS 3 F583W 1 15 S MAX DUR 15 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 131 HD173764 FGS POS 3 F5ND 1 5 S MAX DUR 5 S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 132 HD173764-7- FGS POS 3 F583W 1 10 S MAX DUR 10 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 7486( 12) - 12/18/98 15:30 - [ 6] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 133 HD173764-3- FGS POS 3 F583W 1 10 S MAX DUR 10 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 134 HD173764-6- FGS POS 3 F583W 1 15 S MAX DUR 15 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 135 HD173764 FGS POS 3 F5ND 1 5 S MAX DUR 5 S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 7486( 12) - 12/18/98 15:30 - [ 7] Visit: 02 Visit Priority: Visit Requirements: PCS MODE FINE ORIENT 242D TO 250D BETWEEN 22-Apr-1998 AND 30-Apr-1998 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 ------------------------------------------------------------------------------------------------------------------------------------ 10 HD173764 FGS POS 3 F5ND 1 10 S POS TARG 0.0, 0.0 MAX DUR 10 S SEQ 10-135 NON-INT Comments: OBSERVATION MAY BE TRUNCATED TO SATISFY MONITORING SPACING REQUIREMENTS ------------------------------------------------------------------------------------------------------------------------------------ 20 HD173764-5- FGS POS 3 F583W 1 15 S MAX DUR 15 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 30 HD173764-2- FGS POS 3 F583W 1 20 S MAX DUR 20 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 40 HD173764-3- FGS POS 3 F583W 1 10 S MAX DUR 10 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 50 HD173764-6- FGS POS 3 F583W 1 15 S MAX DUR 15 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 55 HD173764 FGS POS 3 F5ND 1 5 S MAX DUR 5 S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 60 HD173764 FGS TRANS 3 F5ND SCANS=26,STEP-SIZE=1 1 650 S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 70 HD173764 FGS POS 3 F5ND 1 10 S MAX DUR 10 S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 90 HD173764-7- FGS POS 3 F583W 1 10 S MAX DUR 10 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 100 HD173764-2- FGS POS 3 F583W 1 20 S MAX DUR 20 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 110 HD173764-3- FGS POS 3 F583W 1 10 S MAX DUR 10 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 120 HD173764-6- FGS POS 3 F583W 1 15 S MAX DUR 15 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 130 HD173764-5- FGS POS 3 F583W 1 15 S MAX DUR 15 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 131 HD173764 FGS POS 3 F5ND 1 5 S MAX DUR 5 S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 132 HD173764-7- FGS POS 3 F583W 1 10 S MAX DUR 10 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 7486( 12) - 12/18/98 15:30 - [ 8] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 133 HD173764-3- FGS POS 3 F583W 1 10 S MAX DUR 10 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 134 HD173764-6- FGS POS 3 F583W 1 15 S MAX DUR 15 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 135 HD173764 FGS POS 3 F5ND 1 5 S MAX DUR 5 S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 7486( 12) - 12/18/98 15:30 - [ 9] Visit: 03 Visit Priority: Visit Requirements: BETWEEN 29-Apr-1999 AND 20-May-1999 ORIENT 261D TO 266D 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 ------------------------------------------------------------------------------------------------------------------------------------ 10 HD173764 FGS POS 3 F5ND 1 10 S POS TARG 0.0, 0.0 MAX DUR 10 S SEQ 10-160 NON-INT Comments: OBSERVATION MAY BE TRUNCATED TO SATISFY MONITORING SPACING REQUIREMENTS ------------------------------------------------------------------------------------------------------------------------------------ 20 HD173764-5- FGS POS 3 F583W 1 30 S MAX DUR 30 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 30 HD173764-2- FGS POS 3 F583W 1 35 S MAX DUR 35 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 40 HD173764-3- FGS POS 3 F583W 1 25 S MAX DUR 25 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 50 HD173764-6- FGS POS 3 F583W 1 30 S MAX DUR 30 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 55 HD173764-4- FGS POS 3 F583W 1 35 S MAX DUR 35 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 60 HD173764 FGS TRANS 3 F5ND SCANS=18,STEP-SIZE=1 1 450 S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 70 HD173764 FGS POS 3 F5ND 1 10 S MAX DUR 10 S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 90 HD173764-7- FGS POS 3 F583W 1 20 S MAX DUR 20 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 100 HD173764-2- FGS POS 3 F583W 1 35 S MAX DUR 35 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 110 HD173764-3- FGS POS 3 F583W 1 25 S MAX DUR 25 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 120 HD173764-6- FGS POS 3 F583W 1 30 S MAX DUR 30 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 125 HD173764-4- FGS POS 3 F583W 1 35 S MAX DUR 35 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 130 HD173764-5- FGS POS 3 F583W 1 30 S MAX DUR 30 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 140 HD173764 FGS POS 3 F5ND 1 10 S MAX DUR 10 S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 7486( 12) - 12/18/98 15:30 - [ 10] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 150 HD173764-2- FGS POS 3 F583W 1 35 S MAX DUR 35 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 160 HD173764-6- FGS POS 3 F583W 1 30 S MAX DUR 30 S SAME POS AS REF 10 ------------------------------------------------------------------------------------------------------------------------------------ 7486( 12) - 12/18/98 15:30 - [ 11] Summary Form for Proposal 7486 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 3 ------------------------------------------------------------------------------------------------------------------------------------ Configurations FGS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes POS TRANS ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SCANS=26 STEP-SIZE=1 SCANS=18 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PCS MODE FINE ORIENT 74D TO 74D BETWEEN 22-Sep-1997 AND 30-Sep-1997 POS TARG 0.0, 0.0 MAX DUR 5 S SEQ 10-135 NON-INT MAX DUR 15 S SAME POS AS 10 MAX DUR 20 S SAME POS AS 10 MAX DUR 10 S SAME POS AS 10 MAX DUR 5 S SAME POS AS 10 PCS MODE FINE ORIENT 242D TO 250D BETWEEN 22-Apr-1998 AND 30-Apr-1998 POS TARG 0.0, 0.0 MAX DUR 10 S SEQ 10-135 NON-INT BETWEEN 29-Apr-1999 AND 20-May-1999 ORIENT 261D TO 266D POS TARG 0.0, 0.0 MAX DUR 10 S SEQ 10-160 NON-INT MAX DUR 30 S SAME POS AS 10 MAX DUR 35 S SAME POS AS 10 MAX DUR 25 S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F5ND F583W ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD173764 HD173764-5-REF HD173764-2-REF HD173764-3-REF HD173764-6-REF HD173764-7-REF HD173764-4-REF ------------------------------------------------------------------------------------------------------------------------------------