6873( 3) - 03/12/96 11:08 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6873 Version: 3 Check-in Date: 12-Mar-1996 11:02:54 1.Proposal Title: PARALLAXES OF HYADES CLUSTER MEMBERS, CYCLE 6 - HIGH ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle STELLAR POPULATIONS GTO/AST 6 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: WILLIAM H. JEFFERYS UNIVERSITY OF TEXAS CoI: GEORGE F. BENEDICT UNIVERSITY OF TEXAS N CoI: RAYNOR L. DUNCOME UNIVERSITY OF TEXAS N CoI: OTTO G. FRANZ LOWELL OBSERVATORY N CoI: LAURENCE W. FREDRICK UNIVERSITY OF VIRGINIA N CoI: PAUL D. HEMENWAY UNIVERSITY OF TEXAS N CoI: PETER J. SHELUS UNIVERSITY OF TEXAS N CoI: WILLIAM F. VAN ALTENA YALE UNIVERSITY Y ------------------------------------------------------------------------------------ 6. Abstract The goal of this project is to determine trigonometric parall axes for several Hyades cluster members and to define the Population I zero age main sequence. The ZAMS is used to determine the distances to open clusters and to establish the zero point of the Cepheid Period-Luminosity relationship, which is the fundamental distance indicator in the universe. A secondary g oal of this project is to search for new Hyades cluster members which mig ht be as faint at the 25th magnitude, or M(v)=22. This part of the project will be accomplished through coordinated parallel observations with the WFC to determine proper motions of very faint stars over a one year base line. FGS parallax observations of the thirteen Hyades members should yield an error in the distance modulus of the Hyades Cluster good to approximately 0.014 mag. This accuracy should be sufficient to eliminate the Hyades as a source of error in determining the galactic distance scale. ------------------------------------------------------------------------------------ 6873( 3) - 03/12/96 11:08 - [ 2] Observations Description ------------------------ The observations proposed in this proposal are the fifth and sixth observations of the GTO long term project of Hyades parallaxes. They are crucial for the final parallax solutions combining with the previous four sets of observations made in proposals 4935, 5586, and 6157 from cycle3, cycle4, and cycle5. Real Time Justification ----------------------- Parallax observations must be made during the times when the parallax factor is at a maximum in order to achieve the highest possible accuracy in the parallax. The time tolerance of +/- 21 days in the observation dates is already at the maximum level that is acceptable. Calibration Justification ------------------------- All of the FGS observations must be uninterrupted in order to minimize the effects of thermal drifts in the ST structure. Additional Comments ------------------- The data reduction will be done with the Astrometric Data Reduction Software developed by the Astrometry Team on computational facilities already available at the home institutions of the Team members. ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: William Jefferys (PI), University of Texas,*Astronomy Department, Austin, TX 78712, USA,*Telephone 512-471-4461 Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 6873( 3) - 03/12/96 11:08 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 47 PCEN310 CALIBRATION,APERTURE RA=4H 21M 25.44S +/- 0.100S, B1950.00 V = 10.0+/-1.0 LOCATION, DEC= 17D 53' 12.2" +/- 1.00" Comments: THIS TARGET WILL NOT BE MEASURED 48 VA310 STELLAR CLUSTER,OPEN RA=4H 21M 23.11S +/- 0.100S, B1950.00 V = 9.99+/-0.05 CLUSTER, DEC= 17D 53' 19.7" +/- 1.00" Comments: THIS TARGET IS ALSO USED TO MONITOR THE DRIFT OF THE COORDINATE SYSTEM Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) B1950.00 0.008091 -0.027 0.0 50 AST50-REF CALIBRATION,ASTROMETRIC XI-OFF= 3.426' +/- 0.024', ETA- B1950.00 V = 14.6+/-1.0 , OFF= 54.100" +/- 1.000", FROM 47 Comments: THIS TARGET IS ALSO USED TO MONITOR THE DRIFT OF THE COORDINATE SYSTEM 51 AST51-REF CALIBRATION,ASTROMETRIC XI-OFF= 41.397" +/- 1.427", ETA- B1950.00 V = 15.5+/-1.0 , OFF= -21.500" +/- 1.000", FROM 47 52 AST52-REF CALIBRATION,ASTROMETRIC XI-OFF= -1.451' +/- 0.024', ETA- B1950.00 V = 14.5+/-1.0 , OFF= -1.555' +/- 0.017', FROM 47 Comments: THIS TARGET IS ALSO USED TO MONITOR THE DRIFT OF THE COORDINATE SYSTEM 53 AST53-REF CALIBRATION,ASTROMETRIC XI-OFF= -1.594' +/- 0.024', ETA- B1950.00 V = 15.7+/-1.0 , OFF= -19.600" +/- 1.000", FROM 47 54 AST54-REF CALIBRATION,ASTROMETRIC XI-OFF= -3.022' +/- 0.024', ETA- B1950.00 V = 15.3+/-1.0 , OFF= 18.600" +/- 1.000", FROM 47 55 AST55-REF CALIBRATION,ASTROMETRIC XI-OFF= -4.259' +/- 0.024', ETA- B1950.00 V = 15.3+/-1.0 , OFF= -11.800" +/- 1.000", FROM 47 59 PCEN383 CALIBRATION,APERTURE RA=4H 23M 15.87S +/- 0.100S, B1950.00 V = 10.0+/-1.0 LOCATION, DEC= 14D 55' 31.1" +/- 1.00" Comments: THIS TARGET WILL NOT BE MEASURED 60 VA383 STELLAR CLUSTER,OPEN RA=4H 23M 14.37S +/- 0.100S, B1950.00 V = 12.14+/-0.05 CLUSTER, DEC= 14D 55' 43.8" +/- 1.00" Comments: THIS TARGET IS ALSO USED TO MONITOR THE DRIFT OF THE COORDINATE SYSTEM Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) B1950.00 0.007796000000000001 -0.018000000000000002 0.0 61 AST61-REF CALIBRATION,ASTROMETRIC XI-OFF= 4.155' +/- 0.024', ETA- B1950.00 V = 14.7+/-1.0 , OFF= 1.083' +/- 0.017', FROM 59 62 AST62-REF CALIBRATION,ASTROMETRIC XI-OFF= 3.237' +/- 0.024', ETA- B1950.00 V = 14.1+/-1.0 , OFF= 1.465' +/- 0.017', FROM 59 63 AST63-REF CALIBRATION,ASTROMETRIC XI-OFF= -1.449' +/- 0.024', ETA- B1950.00 V = 14.4+/-1.0 , OFF= -5.000" +/- 1.000", FROM 59 64 AST64-REF CALIBRATION,ASTROMETRIC XI-OFF= -4.324' +/- 0.024', ETA- B1950.00 V = 13.6+/-1.0 , OFF= 4.200" +/- 1.000", FROM 59 65 AST65-REF CALIBRATION,ASTROMETRIC XI-OFF= -4.082' +/- 0.024', ETA- B1950.00 V = 14.2+/-1.0 , OFF= -1.303' +/- 0.017', FROM 59 Comments: THIS TARGET IS ALSO USED TO MONITOR THE DRIFT OF THE COORDINATE SYSTEM 6873( 3) - 03/12/96 11:08 - [ 4] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 66 AST66-REF CALIBRATION,ASTROMETRIC XI-OFF= -2.198' +/- 0.024', ETA- B1950.00 V = 15.3+/-1.0 , OFF= -20.300" +/- 1.000", FROM 59 68 AST68-REF CALIBRATION,ASTROMETRIC XI-OFF= 1.145' +/- 0.024', ETA- B1950.00 V = 15.5+/-1.0 , OFF= 19.800" +/- 1.000", FROM 59 69 AST69-REF CALIBRATION,ASTROMETRIC XI-OFF= 5.242' +/- 0.024', ETA- B1950.00 V = 14.1+/-1.0 , OFF= 18.900" +/- 1.000", FROM 59 Comments: THIS TARGET IS ALSO USED TO MONITOR THE DRIFT OF THE COORDINATE SYSTEM 6873( 3) - 03/12/96 11:08 - [ 5] Visit: 01 Visit Requirements: BETWEEN 11-Aug-1996:00:00:00 AND 21-Sep-1996:23:25:24; ORIENT 258.14D TO 259.14D 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 PCEN310 FGS POS 3 F583W ACQ-DIST=0.0 1 0.0S Comments: JUST TO POINT THE TELESCOPE, NON-ZERO EXPOSURE IS UNNECESSARY ------------------------------------------------------------------------------------------------------------------------------------ 20 VA310 FGS POS 3 F583W ACQ-DIST=DEF 1 30S SAME POS AS 10; SEQ 10-130 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 30 AST50-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 40 AST52-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 50 AST51-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 60 AST53-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 70 VA310 FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 80 AST50-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 85 AST52-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 90 AST54-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 100 AST55-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 110 AST52-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 120 VA310 FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 130 AST50-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 6873( 3) - 03/12/96 11:08 - [ 6] Visit: 02 Visit Requirements: BETWEEN 11-Aug-1996:00:00:00 AND 21-Sep-1996:23:26:34; ORIENT 260.5D TO 261.5D 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 PCEN383 FGS POS 3 F583W ACQ-DIST=0.0 1 0.0S Comments: JUST TO POINT THE TELESCOPE, NON-ZERO EXPOSURE IS UNNECESSARY ------------------------------------------------------------------------------------------------------------------------------------ 20 VA383 FGS POS 3 F583W ACQ-DIST=DEF 1 30S SAME POS AS 10; SEQ 10-140 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 30 AST64-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 40 AST65-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 50 AST69-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 60 AST61-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 70 AST62-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 80 VA383 FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 90 AST64-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 100 AST68-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 110 AST63-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 120 AST66-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 125 AST68-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 130 VA383 FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 140 AST64-REF FGS POS 3 F583W 1 30S SAME POS AS 10 ------------------------------------------------------------------------------------------------------------------------------------ 6873( 3) - 03/12/96 11:08 - [ 7] Summary Form for Proposal 6873 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FGS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes POS ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ACQ-DIST=0.0 ACQ-DIST=DEF ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GTO/AST ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR POPULATIONS ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 11-Aug-1996 00 00 00 AND 21-Sep-1996 23 25 24; ORIENT 258.14D TO 259.14D SAME POS AS 10; SEQ 10-130 NON-INT SAME POS AS 10 BETWEEN 11-Aug-1996 00 00 00 AND 21-Sep-1996 23 26 34; ORIENT 260.5D TO 261.5D SAME POS AS 10; SEQ 10-140 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F583W ------------------------------------------------------------------------------------------------------------------------------------ Target Names PCEN310 VA310 AST50-REF AST52-REF AST51-REF AST53-REF AST54-REF AST55-REF PCEN383 VA383 AST64-REF AST65-REF AST69-REF AST61-REF AST62-REF AST68-REF AST63-REF AST66-REF ------------------------------------------------------------------------------------------------------------------------------------