Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 2960c Report Date: 09-May-96:17:41 Version: ********** Check-in Date: ********** 1.Proposal Title: X-RAY BINARIES PART 4 ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID STELLAR ASTROPHYSICS GTO/HSP Sub Category ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Robert C. Bless WISCONSIN, UNIVERSITY OF USA (608)262-1715 ------------------------------------------------------------------------------------ 7. Abstract The extreme conditions existing in the near vicinity of neutron stars which are the secondaries in close binaries provide a laboratory in which we may observationally confirm or refine many of our basic theories of astrophysics. This program will monitor the photometric and polarimetric light curves of X-ray binaries at several different phases of the binary orbit in several different wavelength bands in the UV. The results will be related to the structure of, and physical conditions existing in, the gas streams (and possibly, the accretion disk) in these systems. Revision History: Received on RPS 9/1/89; Added to SCCS 9/5/89 RPSS V7.2 remote & local; Small syntax errs corrected - SALM 9/12/89 Gyros and other changes - Dolan 9/29/89; Move GX339-4 to cycle2, reduce repeats to 4 every 0.93D, coarse track - SALM 2/15/90; Condense POL observations - SALM 2/22/90; Move GX339-4 & A0538-66 to cycle2 - SALM 3/20/90 ------------------------------------------------------------------------------------ 8. Scientific Key Words: X-RAY BINARIES: NEUTRON STARS: BLACK HOLES ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 20.00 par: 0 10. Num targs pri: 10 par: 0 ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 12. Special sched req: Real Time obs. ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 2960c PI: Robert C. Bless Proposal Title: X-RAY BINARIES PART 4 ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ G. W. Van Citters NATIONAL SCIENCE FOUNDATION USA Robert C. Bless WISCONSIN, UNIVERSITY OF USA Joseph F. Dolan NASA, GODDARD SPACE FLIGHT USA CENTER James L. Elliot MASSACHUSETTS INSTITUTE OF USA TECHNOLOGY Edward L. Robinson TEXAS, UNIVERSITY OF USA Richard L. White SPACE TELESCOPE SCIENCE USA INSTITUTE ------------------------------------------------------------------------------------ 3. Description of proposed observations. The photometric and polarimetric light curves of each target will be built up by measuring the magnitude and linear polarization of the system in several different wavelength bands at several different phases in one orbit. Investigation of temporal variations in any gas stream will require observations over several different orbits. Some of these systems undergo substantial luminosity changes in the optical or X-ray region of the spectrum; the observations will be repeated for each different luminosity state the system assumes. Cycle 1 (SV/GTO) observations: Exposures (line numbers) 37 to 48 and lines 55-60 on 1 month centers ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. UV radiation is believed to originate closer to the accretion disk around the secondary in X-ray binaries than does longer wavelength optical radiation. Hence, observations in the UV, accessible only to ST, will probe a different region of the gas streams between the stars than can be done in the optical. It is expected that the results will be more directly relatable to the conditions existing near the neutron star. ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. The observations must be correlated with the period of the binary to obtain the desired light curves. ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. Given scattering from gas streams, the polarimetric (q, u) plot can determine the location of the stream relative to the line of centers and the orbital plane and the eccentricity of the scattering location's orbit about the primary (Dolan and Tapie, Astron. Ap., 139, 249, 1984; Dolan, Astron. Ap., 138, 1, 1984; and references cited therein). The phases at which photometric and polarimetric variability occur provide the longitudinal location of the gas streams; the magnitude of the varitions cn be related to the total amount of material in the stream. The ionization state of the stream can be determined from the dependence of the polarimetric variability on wavelength: Rayleigh scattering varies as the inverse 4th power of the wavelength and indicates neutral atoms as the scattering agents; Thomson scattering is independent of wavelength and indicate free electrons (i.e., ionized atoms) as the scattering agents. Variations in phase of features on the photometric and polarimetric light curves from orbit to orbit will indicate temporal changes in position of the scattering region in the gas streams. Page 3 ------------------------------------------------------------------------------------ 12. The X-ray binaries program is directly related to the first scientific objective listed in the HSP CEI specifications, "determination of the properties of ... X- ray binaries, gas streams and accretion disks in compact binary systems", and to the fifth scientific objective, "determination of the wavelength and time dependence of polarization in compact binaries". ------------------------------------------------------------------------------------ 13. Photometric and polarimetric light curves of X-ray binaries will be established at several different UV wavelengths. Changes in these light curves will be monitored as a function of the luminosity state of the system. The results will be related to the structure of, and physical conditions in, the gas streams and accretion disk in these close binaries. ------------------------------------------------------------------------------------ 11. Address Information Name: R BLESS Category: PI Institution: Address: City: State: Zip Code: Country: Telephone: Telex (or e-mail): ------------------------------------------------------------------------------------ Name: ROBERT C. BLESS Category: PI Institution: UNIVERSITY OF WISCONSIN Address: SPACE ASTRONOMY LAB. 1150 UNIVERSITY AVE. City: MADISON State: WI Zip Code: 53706 Country: USA Telephone: 608-262-1715 Telex (or e-mail): ------------------------------------------------------------------------------------ Name: JOSEPH F. DOLAN Category: CON Institution: NASA, GODDARD SPACE FLIGHT CENTER Address: CODE 681 City: GREENBELT State: MD Zip Code: 20771 Country: USA Telephone: (301)286-5920 Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 2960c [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial |Acqui|FLX| Flux data No | Name | Description | Position |Eqnx | Vel. |Prblm|REF| | | | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 1 HDE226868 X-RAY BINARY RA = 19H 56M 28.8S +/- 0.1S, 1950 1 V=8.6 CYGXR-1 DEC = +35D 03' 55" +/- 1" ------------------------------------------------------------------------------------------------------------------------------------ 2 LMCX-3 ^ RA = 05H 38M 39.7S +/- 0.1S, ^ 1 V=16.9 DEC = -64D 06' 34" +/- 1" ------------------------------------------------------------------------------------------------------------------------------------ 3 HD153919 ^ RA = 17H 00M 32.7S +/- 0.1S, ^ 1 V=6.5 4U1700-37 DEC = -37D 46' 29" +/- 1" ------------------------------------------------------------------------------------------------------------------------------------ 4 HD77581 VELA ^ RA = 09H 00M 13.2S +/- 0.1S, ^ 1 V=6.9 -XR-1 DEC = -40D 21' 25" +/- 1" ------------------------------------------------------------------------------------------------------------------------------------ 5 X-PER ^ RA = 03H 52M 15.1S +/- 0.1S, ^ 1 V=6 4U0352+30 DEC = +30D 54' 01" +/- 1" ------------------------------------------------------------------------------------------------------------------------------------ 6 A0538-66 X-RAY BINARY RA = 05H 35M 42.4S +/- 0.1S, 1950 1 V=12.8 DEC = -66D 53' 39" +/- 1" 2 V=15 ------------------------------------------------------------------------------------------------------------------------------------ 7 4U1907+09 ^ RA = 19H 7M 15.1S +/- 1.5", ^ 1 V=16.4 DEC = +09D 44' 53.5" +/- 1.5" ------------------------------------------------------------------------------------------------------------------------------------ 8 GX339-4 ^ RA = 16H 59M 01.9S +/- 0.1S, ^ 1 V=16 DEC = -48D 43' 06" +/- 1" 2 V=18.5 ------------------------------------------------------------------------------------------------------------------------------------ 9 HD152667 ^ RA = 16H 53M 06.9S +/- 0.1S, ^ 1 V=6.4 DEC = -40D 44' 43.5" +/- 1" ------------------------------------------------------------------------------------------------------------------------------------ 10 4U1820-30 X-RAY BINARY RA = 18H 20M 27.84S +/- 1950 0.9", DEC = -30D 23' 17.0" +/- 0.9" ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 2960c [ 5] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 0.5 DEFINE # HSP/ ACQ 1 24S 6 1 # ACQ2 UV2 ------------------------------------------------------------------------------------------------------------------------------------ 0.6 DEFINE # HSP/ ACQ 1 24S 6 1 # ACQP POL ------------------------------------------------------------------------------------------------------------------------------------ 0.7 DEFINE # HSP/ PEAKUP 10.0 F140LP 1 1M # 1 # CTR2 UV2 ------------------------------------------------------------------------------------------------------------------------------------ 0.8 DEFINE # HSP/ PEAKUP 10.0 F160LP 1 1M # 1 # CTRV VIS ------------------------------------------------------------------------------------------------------------------------------------ 0.9 DEFINE # HSP/ PEAKUP 6.0 F160LP 1 1M # 1 # CTRP POL ------------------------------------------------------------------------------------------------------------------------------------ 0.95 DEFINE # HSP/ PEAKUP 10.0 F140LP 1 1M # 1 # CTR1 UV1 ------------------------------------------------------------------------------------------------------------------------------------ 1 DEFINE # HSP/ SINGLE 1.0 F145M SAMPLE- 1 20S 100 1 # FIRST UV2 TIME=0.0000108 ------------------------------------------------------------------------------------------------------------------------------------ 2 ^ ^ ^ ^ ^ F184W ^ ^ ^ ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 3 ^ ^ ^ ^ ^ F284M ^ ^ ^ ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 4 DEFINE # HSP/ SINGLE 1.0 F248M SAMPLE- 1 20S 100 1 # FIRST UV2 TIME=0.0000108 ------------------------------------------------------------------------------------------------------------------------------------ 5 DEFINE ^ HSP/ ^ ^ F220W ^ ^ ^ ^ ^ FIRST1 UV1 ------------------------------------------------------------------------------------------------------------------------------------ 6 DEFINE ^ HSP/ SINGLE POL0 # SAMPLE-TIME=0.1 ^ 30S ^ ^ SEQ 6-9 NO GAP POL POL ------------------------------------------------------------------------------------------------------------------------------------ 7 ^ ^ ^ ^ POL90 # ^ ^ ^ ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 8 DEFINE # HSP/ SINGLE POL45 # SAMPLE-TIME=0.1 1 30S 100 1 # POL POL ------------------------------------------------------------------------------------------------------------------------------------ 9 ^ ^ ^ ^ POL135 # ^ ^ ^ ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 10 DEFINE # HSP/ STAR- 1.0-A F145M # 1 1M 100 1 # SFIRST UV2 SKY # SAMPLE-TIME=0.1 SKY- SAMPLE=0.005 SKY-APER=1.0-B ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 2960c [ 6] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 ^ ^ ^ ^ 1.0-B F248M # ^ ^ ^ # ^ ^ SKY-APER=1.0-A ------------------------------------------------------------------------------------------------------------------------------------ 12 ^ ^ ^ ^ 1.0-A F284M # ^ ^ ^ # ^ ^ SKY-APER=1.0-B ------------------------------------------------------------------------------------------------------------------------------------ 13 ^ ^ ^ ^ 1.0-B F184W # ^ ^ ^ # ^ ^ SKY-APER=1.0-A ------------------------------------------------------------------------------------------------------------------------------------ 14 DEFINE # HSP/ STAR- 1.0-B F220W # 1 1M 1 # SFIRST1 UV1 SKY # ^ ^ SKY-APER=1.0-A ------------------------------------------------------------------------------------------------------------------------------------ 15 DEFINE ^ HSP/ STAR- POL0 # # 1 33S 100 1 ^ SEQ 15-21 NO GAP SPOL POL SKY # SAMPLE-TIME=1 SKY-SAMPLE=0.1 ------------------------------------------------------------------------------------------------------------------------------------ 17 ^ ^ ^ ^ POL90 # # ^ 33S 100 ^ # ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 19 ^ ^ ^ ^ POL45 # # ^ 33S 100 ^ # ^ ^ ------------------------------------------------------------------------------------------------------------------------------------ 21 DEFINE # HSP/ STAR- POL135 # # 1 33S 100 1 # SPOL POL SKY # SAMPLE-TIME=1 SKY-SAMPLE=0.1 ------------------------------------------------------------------------------------------------------------------------------------ 23 DEFINE ^ HSP/ SINGLE 1.0 F248M SAMPLE- 1 20S 100 1 # REP UV2 TIME=0.0000108 ------------------------------------------------------------------------------------------------------------------------------------ 24 DEFINE ^ ^ STAR- 1.0-B F248M ^ # 1 1M 100 1 ^ SREP SKY # SAMPLE-TIME=1 SKY-SAMPLE=0.1 SKY-APER=1.0-A ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 2960c [ 7] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 69 USE GX339-4 SPOILER- X2 3 SFIRST1 ANGLE=169 SPOILER- SPREAD=10 Comments: OTHER SPOILER-ANGLE IS 227. GYROHOLD. ------------------------------------------------------------------------------------------------------------------------------------ 69.5 USE ^ 10 3 ONBOARD ACQ FOR 70 CTRP 0.3S Comments: GYROHOLD. ------------------------------------------------------------------------------------------------------------------------------------ 70 USE ^ F277M X10 ^ SPOL Comments: GYROHOLD. ------------------------------------------------------------------------------------------------------------------------------------ 70.95 USE GX339-4 X2 3 ONBOARD ACQ FOR ACQP 71.1 REPEAT 70.95-71.1 EVERY 3D +/- 1D FOR 2 MORE TIMES GUID TOL 0.020" Comments: USE COARSE TRACK WHEN NOT ON GYROS. ------------------------------------------------------------------------------------------------------------------------------------ 71.1 USE ^ F277M X10 3 AFTER 70 BY 3D +/- SPOL 1D ------------------------------------------------------------------------------------------------------------------------------------ 71.5 USE ^ 10 2 ONBOARD ACQ FOR 72 CTR2 0.3S Comments: GYROHOLD. ------------------------------------------------------------------------------------------------------------------------------------ 72 USE GX339-4 SPOILER- X2 2 SREP ANGLE=169 SPOILER- SPREAD=10 Comments: OTHER SPOILER-ANGLE IS 227. GYROHOLD. ------------------------------------------------------------------------------------------------------------------------------------ 72.9 USE HD152667 3 ONBOARD ACQ FOR 73 ACQ2 CYCLE 3 / 72.9-78 GUID TOL 0.020" Comments: USE COARSE TRACK WHEN NOT ON GYROS. ------------------------------------------------------------------------------------------------------------------------------------ 73 USE HD152667 ^ SEQ 73-77 NO GAP FIRST ------------------------------------------------------------------------------------------------------------------------------------ 73.5 USE ^ 15 3 ONBOARD ACQ FOR CTR1 0.1S 73.9 Comments: GYROHOLD. ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 2960c [ 8] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 73.9 USE ^ ^ SFIRST1 Comments: GYROHOLD. ------------------------------------------------------------------------------------------------------------------------------------ 73.95 USE ^ 15 3 ONBOARD ACQ FOR 74 CTRP 0.1S -77 Comments: GYROHOLD. ------------------------------------------------------------------------------------------------------------------------------------ 74 USE POL HD152667 F216M 3 Comments: GYROHOLD. ------------------------------------------------------------------------------------------------------------------------------------ 75 USE POL HD152667 F237M 3 Comments: GYROHOLD. ------------------------------------------------------------------------------------------------------------------------------------ 76 ^ ^ F327M ^ Comments: GYROHOLD. ------------------------------------------------------------------------------------------------------------------------------------ 77 USE POL HD152667 F277M 3 Comments: GYROHOLD. ------------------------------------------------------------------------------------------------------------------------------------ 77.05 USE HD152667 3 ONBOARD ACQ FOR ACQP 77.1 GUID TOL 0.020" Comments: USE COARSE TRACK WHEN NOT ON GYROS. ------------------------------------------------------------------------------------------------------------------------------------ 77.1 USE POL ^ F277M ^ SEQ 77.1-78 NO GAP AFTER 77 BY 0.78D +/- 0.1D REPEAT 77.050-78 EVERY 0.785D +/- 0.1D FOR 8 MORE TIMES ------------------------------------------------------------------------------------------------------------------------------------ 77.5 USE ^ 15 3 ONBOARD ACQ FOR 78 CTR2 0.1S Comments: GYROHOLD. ------------------------------------------------------------------------------------------------------------------------------------ 78 USE REP ^ ^ Comments: GYROHOLD. ------------------------------------------------------------------------------------------------------------------------------------ 79 4U1820-30 PC IMAGE ALL F336W 1 5M 2 EARLY ACQ FOR 82 CYCLE 1 / 79-85 UNPROTECTED GUID TOL 0.020" Comments: USE COARSE TRACK WHEN NOT ON GYROS. ------------------------------------------------------------------------------------------------------------------------------------ 80 ^ ^ ^ ^ F702W ^ ^ ^ SEQ 79-80 NO GAP UNPROTECTED ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 2960c [ 9] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 81 USE ^ X10 2 INT ACQ FOR 82-83 ACQ2 GUID TOL 0.020" Comments: USE COARSE TRACK WHEN NOT ON GYROS. ------------------------------------------------------------------------------------------------------------------------------------ 82 4U1820-30 HSP/ SINGLE 0.4 F140LP SAMPLE- 1 25M 2 UNPROTECTED UV2 TIME=0.0000108 ------------------------------------------------------------------------------------------------------------------------------------ 83 ^ ^ ^ ^ F248M ^ ^ ^ ^ UNPROTECTED ------------------------------------------------------------------------------------------------------------------------------------ 83.5 USE ^ X10 2 INT ACQ FOR 84-85 ACQ2 GUID TOL 0.020" Comments: USE COARSE TRACK WHEN NOT ON GYROS. ------------------------------------------------------------------------------------------------------------------------------------ 84 4U1820-30 HSP/ SINGLE 0.4 F140LP SAMPLE- 1 25M 2 COND ON 83 IF NO UV2 TIME=0.0000108 685S PERIOD FOUND UNPROTECTED ------------------------------------------------------------------------------------------------------------------------------------ 85 4U1820-30 HSP/ SINGLE 0.4 F284M SAMPLE- 1 25M 2 COND ON 83 IF NO UV2 TIME=0.0000108 685S PERIOD FOUND UNPROTECTED ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 2960c [ 10] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HSP/UV2 HSP/POL HSP/VIS HSP/UV1 ^ PC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ PEAKUP SINGLE ^ STAR-SKY IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SAMPLE-TIME=0.0000108 SAMPLE-TIME=0.1 SKY-SAMPLE=0.005 SKY-APER=1.0-B SKY-APER=1.0-A SAMPLE-TIME=1 SKY-SAMPLE=0.1 SPOILER-ANGLE=169 SPOILER-SPREAD=10 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GTO/HSP ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 20.00 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR ASTROPHYSICS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements SEQ 6-9 NO GAP; SEQ 15-21 NO GAP; ONBOARD ACQ FOR 70; ONBOARD ACQ FOR 71.1; REPEAT 70.95-71.1 EVERY 3D +/- 1D FOR 2 MORE TIMES; GUID TOL 0.020" AFTER 70 BY 3D +/- 1D; ONBOARD ACQ FOR 72; ONBOARD ACQ FOR 73; CYCLE 3 / 72.9-78; SEQ 73-77 NO GAP; ONBOARD ACQ FOR 73.9; ONBOARD ACQ FOR 74-77; ONBOARD ACQ FOR 77.1; SEQ 77.1-78 NO GAP; AFTER 77 BY 0.78D +/- 0.1D; REPEAT 77.050-78 EVERY 0.785D +/- 0.1D FOR 8 MORE TIMES; ONBOARD ACQ FOR 78; EARLY ACQ FOR 82; CYCLE 1 / 79-85; UNPROTECTED; SEQ 79-80 NO GAP; INT ACQ FOR 82-83; INT ACQ FOR 84-85; COND ON 83 IF NO 685S PERIOD FOUND; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F140LP F160LP F145M F184W F284M F248M F220W # F277M F216M F237M F327M F336W F702W ------------------------------------------------------------------------------------------------------------------------------------ Target Names HDE226868 CYGXR-1 LMCX-3 HD153919 4U1700-37 HD77581 VELA-XR-1 X-PER 4U0352+30 A0538-66 4U1907+09 GX339-4 HD152667 4U1820-30 ------------------------------------------------------------------------------------------------------------------------------------