5498( 16) - 03/08/96 14:53 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5498 Version: 16 Check-in Date: 08-Mar-1996 14:16:21 1.Proposal Title: FLICKERING AS A PROBE OF ACCRETION DISK STRUCTURE ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle HOT STARS,ERUPTIVE BI GO 4 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: HORNE, KEITH ------------------------------------------------------------------------------------ 6. Abstract We will use the FOS in RAPID mode (<3.2s time resolution) to record light curves,spectra, power spectra, and wavelength-to-wavelength correlations in a study of flickering accretion disks in 3 bright cataclysmic variables. An enigmatic signature of accretion, flickering is probably a key to the poorly understood mechanism of accretion disk viscosity. Characterizing flickering properties over a wide range of wavelengths sensing different physical conditions at different radii in the disk will constrain flickering mechanisms and test the specific prediction that flickering occurs on the Keplerian timescale at each radius in the disk. Optical light senses a superposition of flickering from all disk radii, while UV light isolates flickering from the hotter inner regions. A standard steady-state disk model, predicts a break in the flickering power spectrum at a timescale proportional to wavelength squared and to the square root of the mass accretion rate. IUE's long-term monitoring campaigns searched for this effect in Seyfert galaxies, where the expected Kepler timescale is days to weeks, but the disk predictions were not confirmed -- the Seyfert's optical and ultraviolet continua varied synchronously. Does this mean that Seyfert's don't possess disks? Our experiment will discover if the disk predictions hold up for flickering in cataclysmic variables, where we know disks are present. ------------------------------------------------------------------------------------ Observations Description ------------------------ Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 5498( 16) - 03/08/96 14:53 - [ 2] Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 5498( 16) - 03/08/96 14:53 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 TT-ARI STAR,NOVA- RA=2H 6M 53.101S +/- J2000 V = 11.0+/-1.0 LIKE,INTERACTING 0.040S,DEC=15D 17' 42.63" +/- B-V = -4.0+/-8.0e-2 BINARY,ACCRETION DISK, 0.60",PLATE-ID=03QO U-B = -8.8+/-0.7000000000000001e-1 F-CONT(1300.0)=9.5+/-1.0e-13 F-CONT(1500.0)=7.000000000000001+/-1.0e- 13 F-CONT(2500.0)=30.0+/-5.0e-14 Comments: VARIABLE STAR,INTERACTING BINARY (NOVA-LIKE). POSSIBLE UV FLUCTUATIONS OF 10% IN A FEW MIN. V = 9.6-12.3 BRIGHT STATE (USUAL). V =14.5-16.3 LOW STATE (RARE). V =11.0-12.3 MOST LIKELY. A(V)=0.16 ALSO KNOWN AS BD+14D341. 2 V603-AQL STAR,CLASSICAL RA=18H 48M 54.5S +/- J2000 V = 11.6+/-0.4 NOVA,INTERACTING 0.027S,DEC=0D 35' 2.9" +/- 0.40" B-V = -6.0+/-3.0e-2 BINARY,ACCRETION DISK, U-B = -9.0+/-0.8999999999999999e-1 F-CONT(1300.0)=12.5+/-1.0e-13 F-CONT(1500.0)=9.0+/-1.0e-13 F-CONT(2500.0)=3.5000000000000004+/-0.5e -13 Comments: VARIABLE STAR, INTERACTING BINARY (CLASSICAL NOVA). POSSIBLE UV FLUCTUATIONS OF 10% IN A FEW MIN. A(V)=0.5 ALSO KNOWN AS NOVA AQL 1918 ALSO KNOWN AS HD174107 3 V3885-SGR STAR,NOVA- RA=19H 47M 40.59S +/- J2000 V = 10.0+/-0.3 LIKE,INTERACTING 0.040S,DEC=-42D 0' 29.8" +/- B-V = 0.0+/-20.0e-3 BINARY,ACCRETION DISK, 0.60" U-B = -7.199999999999999+/-0.5e-1 F-CONT(1300.0)=5.800000000000001+/-0.5e- 12 F-CONT(1500.0)=4.0+/-0.5e-12 F-CONT(2500.0)=13.0+/-3.0e-13 Comments: VARIABLE STAR,INTERACTING BINARY (NOVA-LIKE). POSSIBLE UV FLUCTUATIONS OF 10% IN A FEW MIN. A(V) = 0.16 ALSO KNOWN AS CPD-42D8912. ALSO KNOWN AS CD-42D14462. 4 V3885-SGR- STAR,NOVA- RA=19H 47M 40.51S +/- J2000 V = 10.0+/-0.3 FIXED LIKE,INTERACTING 0.040S,DEC=-42D 0' 25.9" +/- B-V = 0.0+/-20.0e-3 BINARY,ACCRETION DISK, 0.60" U-B = -7.199999999999999+/-0.5e-1 F-CONT(1300.0)=5.800000000000001+/-0.5e- 12 F-CONT(1500.0)=4.0+/-0.5e-12 F-CONT(2500.0)=13.0+/-3.0e-13 Comments: VARIABLE STAR,INTERACTING BINARY (NOVA-LIKE). POSSIBLE UV FLUCTUATIONS OF 10% IN A FEW MIN. A(V) = 0.16 ALSO KNOWN AS CPD-42D8912. ALSO KNOWN AS CD-42D14462. 5498( 16) - 03/08/96 14:53 - [ 4] Visit: 01 Visit Requirements: 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 TT-ARI FOS/BL ACQ/PEA 4.3 G190H SEARCH-SIZE- 1 10S ONBOARD ACQ FOR 20 K Y=3,SEARCH-SIZE -X=1,SCAN-STEP- Y=1.204 Comments: BRIGHT VARIABLE STAR. UV FLUCTUATIONS EXPECTED. ------------------------------------------------------------------------------------------------------------------------------------ 20 TT-ARI FOS/BL ACQ/PEA 1.0 G190H SEARCH-SIZE- 1 11S ONBOARD ACQ FOR 30-60 K Y=2,SEARCH-SIZE -X=6,SCAN-STEP- Y=0.602,SCAN- STEP-X=0.602 ------------------------------------------------------------------------------------------------------------------------------------ 30 TT-ARI FOS/BL RAPID 4.3 G160L STEP- 1 18M NO SPLIT TIME=.4,SUB- STEP=1,READ- TIME=0.40 Comments: USE HIGH SPEED 1MBIT/SEC RATE. READ-TIME (TIME RESOLUTION) MUST NOT BE ALTERED; BOOST TIME_PER_EXP INSTEAD. NOTE THAT RAPID READOUT IS TO OBSERVE FLICKERING, AND IS NOT CONTRAINED BY S/N REQUIREMENTS. ------------------------------------------------------------------------------------------------------------------------------------ 40 TT-ARI FOS/BL RAPID 4.3 G160L SUB-STEP=1,READ 1 32M NO SPLIT -TIME=1.60 Comments: READ-TIME (TIME RESOLUTION) MUST NOT BE ALTERED; IF NEEDED, BOOST TIME_PER_EXP INSTEAD. BE SURE TO USE THE 32BIT/SEC RATE (WILL REQUIRE SPECIAL COMMANDING). ------------------------------------------------------------------------------------------------------------------------------------ 50 TT-ARI FOS/BL RAPID 4.3 G160L SUB-STEP=2,READ 1 28M NO SPLIT -TIME=3.20 Comments: READ-TIME (TIME RESOLUTION) MUST NOT BE ALTERED; IF NEEDED, BOOST TIME_PER_EXP INSTEAD. ------------------------------------------------------------------------------------------------------------------------------------ 60 TT-ARI FOS/RD RAPID 4.3 PRISM SUB-STEP=2,READ 1 28M NO SPLIT -TIME=3.20 Comments: READ-TIME (TIME RESOLUTION) MUST NOT BE ALTERED; IF NEEDED, BOOST THE TIME_PER_EXP INSTEAD. USE 32BIT/SEC RATE. NOTE: RAPID READOUT IS TO OBSERVE FLICKERING, AND IS NOT CONSTRAINED BY S/N REQUIREMENTS. ------------------------------------------------------------------------------------------------------------------------------------ 5498( 16) - 03/08/96 14:53 - [ 5] Visit: 02 Visit Requirements: 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 V603-AQL FOS/BL ACQ/PEA 4.3 G190H SEARCH-SIZE- 1 10S ONBOARD ACQ FOR 20 K Y=3,SEARCH-SIZE -X=1,SCAN-STEP- Y=1.204 Comments: BRIGHT VARIABLE STAR. UV FLUCTUATIONS EXPECTED. ------------------------------------------------------------------------------------------------------------------------------------ 20 V603-AQL FOS/BL ACQ/PEA 1.0 G190H SEARCH-SIZE- 1 11S ONBOARD ACQ FOR 30-60 K Y=2,SEARCH-SIZE -X=6,SCAN-STEP- Y=0.602,SCAN- STEP-X=0.602 ------------------------------------------------------------------------------------------------------------------------------------ 30 V603-AQL FOS/BL RAPID 4.3 G160L STEP- 1 18M NO SPLIT TIME=.4,SUB- STEP=1,READ- TIME=0.40 Comments: USE HIGH SPEED 1MBIT/SEC RATE. READ-TIME (TIME RESOLUTION) MUST NOT BE ALTERED; BOOST TIME_PER_EXP INSTEAD. NOTE THAT RAPID READOUT IS TO OBSERVE FLICKERING, AND IS NOT CONTRAINED BY S/N REQUIREMENTS. ------------------------------------------------------------------------------------------------------------------------------------ 40 V603-AQL FOS/BL RAPID 4.3 G160L SUB-STEP=1,READ 1 32M NO SPLIT -TIME=1.60 Comments: READ-TIME (TIME RESOLUTION) MUST NOT BE ALTERED; IF NEEDED, BOOST TIME_PER_EXP INSTEAD. BE SURE TO USE THE 32BIT/SEC RATE (WILL REQUIRE SPECIAL COMMANDING). ------------------------------------------------------------------------------------------------------------------------------------ 50 V603-AQL FOS/BL RAPID 4.3 G160L SUB-STEP=2,READ 1 28M NO SPLIT -TIME=3.20 Comments: READ-TIME (TIME RESOLUTION) MUST NOT BE ALTERED; IF NEEDED, BOOST TIME_PER_EXP INSTEAD. BE SURE TO USE THE 32BIT/SEC RATE ------------------------------------------------------------------------------------------------------------------------------------ 60 V603-AQL FOS/RD RAPID 4.3 PRISM SUB-STEP=2,READ 1 28M NO SPLIT -TIME=3.20 Comments: READ-TIME (TIME RESOLUTION) MUST NOT BE ALTERED; IF NEEDED, BOOST THE TIME_PER_EXP INSTEAD. USE 32BIT/SEC RATE. NOTE: RAPID READOUT IS TO OBSERVE FLICKERING, AND IS NOT CONSTRAINED BY S/N REQUIREMENTS. ------------------------------------------------------------------------------------------------------------------------------------ 5498( 16) - 03/08/96 14:53 - [ 6] Visit: 03 Visit Requirements: 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 V3885-SGR FOS/BL ACQ/PEA 4.3 G190H SEARCH-SIZE- 1 1S ONBOARD ACQ FOR 20 K Y=3,SEARCH-SIZE -X=1,SCAN-STEP- Y=1.204 Comments: BRIGHT VARIABLE STAR. UV FLUCTUATIONS EXPECTED. ------------------------------------------------------------------------------------------------------------------------------------ 20 V3885-SGR FOS/BL ACQ/PEA 1.0 G190H SEARCH-SIZE- 1 1.1S ONBOARD ACQ FOR 30-60 K Y=2,SEARCH-SIZE -X=6,SCAN-STEP- Y=0.602,SCAN- STEP-X=0.602 ------------------------------------------------------------------------------------------------------------------------------------ 30 V3885-SGR FOS/BL RAPID 4.3 G160L STEP- 1 20M NO SPLIT TIME=.4,SUB- STEP=1,READ- TIME=0.40 Comments: USE HIGH SPEED 1MBIT/SEC RATE. READ-TIME (TIME RESOLUTION) MUST NOT BE ALTERED; BOOST TIME_PER_EXP INSTEAD. NOTE THAT RAPID READOUT IS TO OBSERVE FLICKERING, AND IS NOT CONTRAINED BY S/N REQUIREMENTS. ------------------------------------------------------------------------------------------------------------------------------------ 40 V3885-SGR FOS/BL RAPID 4.3 G160L SUB-STEP=1,READ 1 32M NO SPLIT -TIME=1.60 Comments: READ-TIME (TIME RESOLUTION) MUST NOT BE ALTERED; IF NEEDED, BOOST TIME_PER_EXP INSTEAD. BE SURE TO USE THE 32BIT/SEC RATE (WILL REQUIRE SPECIAL COMMANDING). ------------------------------------------------------------------------------------------------------------------------------------ 50 V3885-SGR FOS/BL RAPID 4.3 G160L SUB-STEP=2,READ 1 28M NO SPLIT -TIME=3.20 Comments: READ-TIME (TIME RESOLUTION) MUST NOT BE ALTERED; IF NEEDED, BOOST TIME_PER_EXP INSTEAD. BE SURE TO USE THE 32BIT/SEC RATE ------------------------------------------------------------------------------------------------------------------------------------ 60 V3885-SGR FOS/RD RAPID 4.3 PRISM SUB-STEP=2,READ 1 28M NO SPLIT -TIME=3.20 Comments: READ-TIME (TIME RESOLUTION) MUST NOT BE ALTERED; IF NEEDED, BOOST THE TIME_PER_EXP INSTEAD. USE 32BIT/SEC RATE. NOTE: RAPID READOUT IS TO OBSERVE FLICKERING, AND IS NOT CONSTRAINED BY S/N REQUIREMENTS. ------------------------------------------------------------------------------------------------------------------------------------ 5498( 16) - 03/08/96 14:53 - [ 7] Visit: 04 Visit Requirements: 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 V3885-SGR- FOS/BL ACQ/PEA 4.3 G190H SEARCH-SIZE- 1 1S ONBOARD ACQ FOR 20 FIXED K Y=3,SEARCH-SIZE -X=1,SCAN-STEP- Y=1.204 Comments: BRIGHT VARIABLE STAR. UV FLUCTUATIONS EXPECTED. ------------------------------------------------------------------------------------------------------------------------------------ 20 V3885-SGR- FOS/BL ACQ/PEA 1.0 G190H SEARCH-SIZE- 1 1.1S ONBOARD ACQ FOR 30-60 FIXED K Y=2,SEARCH-SIZE -X=6,SCAN-STEP- Y=0.602,SCAN- STEP-X=0.602 ------------------------------------------------------------------------------------------------------------------------------------ 30 V3885-SGR- FOS/BL RAPID 4.3 G160L STEP- 1 1050S NO SPLIT MAX DUR 1050S FIXED TIME=.4,SUB- STEP=1,READ- TIME=0.40 Comments: USE HIGH SPEED 1MBIT/SEC RATE. READ-TIME (TIME RESOLUTION) MUST NOT BE ALTERED; BOOST TIME_PER_EXP INSTEAD. NOTE THAT RAPID READOUT IS TO OBSERVE FLICKERING, AND IS NOT CONTRAINED BY S/N REQUIREMENTS. ------------------------------------------------------------------------------------------------------------------------------------ 40 V3885-SGR- FOS/BL RAPID 4.3 G160L SUB-STEP=1,READ 1 32M NO SPLIT FIXED -TIME=1.60 Comments: READ-TIME (TIME RESOLUTION) MUST NOT BE ALTERED; IF NEEDED, BOOST TIME_PER_EXP INSTEAD. BE SURE TO USE THE 32BIT/SEC RATE (WILL REQUIRE SPECIAL COMMANDING). ------------------------------------------------------------------------------------------------------------------------------------ 50 V3885-SGR- FOS/BL RAPID 4.3 G160L SUB-STEP=2,READ 1 28M NO SPLIT FIXED -TIME=3.20 Comments: READ-TIME (TIME RESOLUTION) MUST NOT BE ALTERED; IF NEEDED, BOOST TIME_PER_EXP INSTEAD. BE SURE TO USE THE 32BIT/SEC RATE ------------------------------------------------------------------------------------------------------------------------------------ 60 V3885-SGR- FOS/RD RAPID 4.3 PRISM SUB-STEP=2,READ 1 28M NO SPLIT FIXED -TIME=3.20 Comments: READ-TIME (TIME RESOLUTION) MUST NOT BE ALTERED; IF NEEDED, BOOST THE TIME_PER_EXP INSTEAD. USE 32BIT/SEC RATE. NOTE: RAPID READOUT IS TO OBSERVE FLICKERING, AND IS NOT CONSTRAINED BY S/N REQUIREMENTS. ------------------------------------------------------------------------------------------------------------------------------------ 5498( 16) - 03/08/96 14:53 - [ 8] Summary Form for Proposal 5498 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOS/BL FOS/RD ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/PEAK RAPID ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SEARCH-SIZE-Y=3 SEARCH-SIZE-X=1 SCAN-STEP-Y=1.204 SCAN-STEP-X=0.602 READ-TIME=0.40 READ-TIME=1.60 READ-TIME=3.20 SUB-STEP=2 SCAN-STEP-Y=0.602 SUB-STEP=1 SEARCH-SIZE-X=6 STEP-TIME=.4 SEARCH-SIZE-Y=2 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category HOT STARS,ERUPTIVE BINARIES ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 20 ONBOARD ACQ FOR 30-60 NO SPLIT NO SPLIT MAX DUR 1050S ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G190H G160L PRISM ------------------------------------------------------------------------------------------------------------------------------------ Target Names TT-ARI V603-AQL V3885-SGR V3885-SGR-FIXED ------------------------------------------------------------------------------------------------------------------------------------