13806( 3) - 24-Jul-2014 12:40:02 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13806 Version: 3 Check-in Time: 24-Jul-2014 12:40:02 STScI Edit Number: 0 Title UV spectroscopy of the most massive overcontact binary known to date: on the verge of coalescence ? ------------------------------------------------------------------------------------ Type Cycle GO 22 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Hugues Sana Space Telescope Science Institute - ESA Y CoI: Dr. Leonardo Almeida The Johns Hopkins University N CoI: Dr. Selma E. de Mink Carnegie Institution of Washington N CoI: Dr. Alexander W. Fullerton Space Telescope Science Institute N CoI: Dr. Norbert Langer Universitat Bonn, Argelander Institute for N Astronomy CoI: Mr. Frank Tramper Universiteit van Amsterdam N CoI: Dr. Alex De Koter Universiteit van Amsterdam N CoI: Mr. Oscar Ramirez-Agudelo Universiteit van Amsterdam N CoI: Dr. Alceste Z. Bonanos National Observatory of Athens N CoI: Dr. Elena Sabbi Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract Binary interaction dominates the evolution of massive stars. Because of the abundance of short period systems, about a quarter of all massive stars are thought to merge with their companion. The short-lived contact phase preceding coalescence is poorly understood due to the lack of observational constraints: only two overcontact O-type binaries are known so far. Yet, these systems provide crucial observational testbeds to understand the elusive formation and evolution of the most massive stars, the complex physics of stellar mergers and the role that the coalescence products play as progenitors of supernovae and gamma-ray bursts. We recently discovered VFTS 352, the most massive, earliest spectral type and shortest period (P = 1.12 d) overcontact O-type binary known to date. With an estimated combined mass of 130 Msun, this truly unique system is expected to merge into a rapidly rotating, very massive, single star. Initial estimates of the physical parameters were derived from high-quality ground-based optical spectra and photometry. Yet, optical analyses of overcontact systems can overestimate the radial-velocity amplitudes, hence the masses, by up to 40% because optical lines are susceptible to irradiation effects. Here we propose a limited 8-epochs COS monitoring of VFTS 352. The G130M and G160M spectra will allow us to side step the uncertainties affecting optical determination of the masses and to constrain the mass loss rate and CNO surface abundances. These constraints are crucial to identify the complex mixing processes, to reveal signs of mass exchange and mass loss from the system, and to enable a comparison with massive binary evolution models. ------------------------------------------------------------------------------------ Observations Description ------------------------ We perform G130m/1291 and G160M/1611 COS FUV spectroscopy of the same object at 8 different orbital phase (exposure centered on phases 0.0, 0.125, 0.25, 0.375, 0.5, 0.625, 0.75 and 0.875). Kind request that all observations are done within 2 weeks and at the same LP position. 13806( 3) - 24-Jul-2014 12:40:02 - [ 2] ------------------------------------------------------------------------------------ 13806( 3) - 24-Jul-2014 12:40:02 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 VFTS352 STAR, MAIN SEQUENCE O RA=05H38M28.4253S +/- 0.3", J2000 V = 14.4 F275W = 13.3mag DEC=-69D11'18.96" +/- 0.3" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 13806( 3) - 24-Jul-2014 12:40:02 - [ 4] Visit: 01 Visit Requirements: Period 1.124147 D AND ZERO-PHASE HJD2457023.218; GROUP 01, 02, 03, 04, 05, 06, 07, 08 WITHIN 12D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 VFTS352 COS/NUV ACQ/IMA PSA MIRRORB 1 5.3 S (5.3 PHASE 0.965 TO 0.995 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 VFTS352 COS/FUV TIME-TA PSA G130M 1291 FP-POS=1, BUFFER-TIME=350 1 450 S (450 G S) ------------------------------------------------------------------------------------------------------------------------------------ 3 VFTS352 COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=350 1 450 S (450 G S) ------------------------------------------------------------------------------------------------------------------------------------ 4 VFTS352 COS/FUV TIME-TA PSA G160M 1611 FP-POS=1, BUFFER-TIME=640 1 750 S (750 G S) ------------------------------------------------------------------------------------------------------------------------------------ 5 VFTS352 COS/FUV TIME-TA PSA G160M 1611 FP-POS=3, BUFFER-TIME=640 1 750 S (750 G S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ VFTS352 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE VFTS352 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G VFTS352 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G VFTS352 4 COS/FUV TIME-TA PSA G160M 1611 none none none none 1 N/A G VFTS352 5 COS/FUV TIME-TA PSA G160M 1611 none none none none 1 N/A G 13806( 3) - 24-Jul-2014 12:40:02 - [ 5] Visit: 02 Visit Requirements: Period 1.124147 D AND ZERO-PHASE HJD2457023.218; GROUP 02, 01, 03, 04, 05, 06, 07, 08 WITHIN 12D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 VFTS352 COS/NUV ACQ/IMA PSA MIRRORB 1 5.3 S (5.3 PHASE 0.09 TO 0.12 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 VFTS352 COS/FUV TIME-TA PSA G130M 1291 FP-POS=2, BUFFER-TIME=350 1 450 S (450 G S) ------------------------------------------------------------------------------------------------------------------------------------ 3 VFTS352 COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=350 1 450 S (450 G S) ------------------------------------------------------------------------------------------------------------------------------------ 4 VFTS352 COS/FUV TIME-TA PSA G160M 1611 FP-POS=2, BUFFER-TIME=640 1 750 S (750 G S) ------------------------------------------------------------------------------------------------------------------------------------ 5 VFTS352 COS/FUV TIME-TA PSA G160M 1611 FP-POS=4, BUFFER-TIME=640 1 750 S (750 G S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ VFTS352 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE VFTS352 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G VFTS352 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G VFTS352 4 COS/FUV TIME-TA PSA G160M 1611 none none none none 1 N/A G VFTS352 5 COS/FUV TIME-TA PSA G160M 1611 none none none none 1 N/A G 13806( 3) - 24-Jul-2014 12:40:02 - [ 6] Visit: 03 Visit Requirements: Period 1.124147 D AND ZERO-PHASE HJD2457023.218; GROUP 03, 01, 02, 04, 05, 06, 07, 08 WITHIN 12D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 VFTS352 COS/NUV ACQ/IMA PSA MIRRORB 1 5.3 S (5.3 PHASE 0.215 TO 0.245 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 VFTS352 COS/FUV TIME-TA PSA G130M 1291 FP-POS=1, BUFFER-TIME=350 1 450 S (450 G S) ------------------------------------------------------------------------------------------------------------------------------------ 3 VFTS352 COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=350 1 450 S (450 G S) ------------------------------------------------------------------------------------------------------------------------------------ 4 VFTS352 COS/FUV TIME-TA PSA G160M 1611 FP-POS=1, BUFFER-TIME=640 1 750 S (750 G S) ------------------------------------------------------------------------------------------------------------------------------------ 5 VFTS352 COS/FUV TIME-TA PSA G160M 1611 FP-POS=3, BUFFER-TIME=640 1 750 S (750 G S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ VFTS352 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE VFTS352 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G VFTS352 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G VFTS352 4 COS/FUV TIME-TA PSA G160M 1611 none none none none 1 N/A G VFTS352 5 COS/FUV TIME-TA PSA G160M 1611 none none none none 1 N/A G 13806( 3) - 24-Jul-2014 12:40:02 - [ 7] Visit: 04 Visit Requirements: Period 1.124147 D AND ZERO-PHASE HJD2457023.218; GROUP 04, 01, 02, 03, 05, 06, 07, 08 WITHIN 12D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 VFTS352 COS/NUV ACQ/IMA PSA MIRRORB 1 5.3 S (5.3 PHASE 0.340 TO 0.37 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 VFTS352 COS/FUV TIME-TA PSA G130M 1291 FP-POS=2, BUFFER-TIME=350 1 450 S (450 G S) ------------------------------------------------------------------------------------------------------------------------------------ 3 VFTS352 COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=350 1 450 S (450 G S) ------------------------------------------------------------------------------------------------------------------------------------ 4 VFTS352 COS/FUV TIME-TA PSA G160M 1611 FP-POS=2, BUFFER-TIME=640 1 750 S (750 G S) ------------------------------------------------------------------------------------------------------------------------------------ 5 VFTS352 COS/FUV TIME-TA PSA G160M 1611 FP-POS=4, BUFFER-TIME=640 1 750 S (750 G S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ VFTS352 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE VFTS352 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G VFTS352 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G VFTS352 4 COS/FUV TIME-TA PSA G160M 1611 none none none none 1 N/A G VFTS352 5 COS/FUV TIME-TA PSA G160M 1611 none none none none 1 N/A G 13806( 3) - 24-Jul-2014 12:40:02 - [ 8] Visit: 05 Visit Requirements: Period 1.124147 D AND ZERO-PHASE HJD2457023.218; GROUP 05, 01, 02, 03, 04, 06, 07, 08 WITHIN 12D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 VFTS352 COS/NUV ACQ/IMA PSA MIRRORB 1 5.3 S (5.3 PHASE 0.465 TO 0.495 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 VFTS352 COS/FUV TIME-TA PSA G130M 1291 FP-POS=2, BUFFER-TIME=350 1 450 S (450 G S) ------------------------------------------------------------------------------------------------------------------------------------ 3 VFTS352 COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=350 1 450 S (450 G S) ------------------------------------------------------------------------------------------------------------------------------------ 4 VFTS352 COS/FUV TIME-TA PSA G160M 1611 FP-POS=2, BUFFER-TIME=640 1 750 S (750 G S) ------------------------------------------------------------------------------------------------------------------------------------ 5 VFTS352 COS/FUV TIME-TA PSA G160M 1611 FP-POS=4, BUFFER-TIME=640 1 750 S (750 G S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ VFTS352 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE VFTS352 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G VFTS352 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G VFTS352 4 COS/FUV TIME-TA PSA G160M 1611 none none none none 1 N/A G VFTS352 5 COS/FUV TIME-TA PSA G160M 1611 none none none none 1 N/A G 13806( 3) - 24-Jul-2014 12:40:02 - [ 9] Visit: 06 Visit Requirements: Period 1.124147 D AND ZERO-PHASE HJD2457023.218; GROUP 06, 01, 02, 03, 04, 05, 07, 08 WITHIN 12D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 VFTS352 COS/NUV ACQ/IMA PSA MIRRORB 1 5.3 S (5.3 PHASE 0.59 TO 0.62 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 VFTS352 COS/FUV TIME-TA PSA G130M 1291 FP-POS=1, BUFFER-TIME=350 1 450 S (450 G S) ------------------------------------------------------------------------------------------------------------------------------------ 3 VFTS352 COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=350 1 450 S (450 G S) ------------------------------------------------------------------------------------------------------------------------------------ 4 VFTS352 COS/FUV TIME-TA PSA G160M 1611 FP-POS=1, BUFFER-TIME=640 1 750 S (750 G S) ------------------------------------------------------------------------------------------------------------------------------------ 5 VFTS352 COS/FUV TIME-TA PSA G160M 1611 FP-POS=3, BUFFER-TIME=640 1 750 S (750 G S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ VFTS352 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE VFTS352 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G VFTS352 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G VFTS352 4 COS/FUV TIME-TA PSA G160M 1611 none none none none 1 N/A G VFTS352 5 COS/FUV TIME-TA PSA G160M 1611 none none none none 1 N/A G 13806( 3) - 24-Jul-2014 12:40:02 - [ 10] Visit: 07 Visit Requirements: Period 1.124147 D AND ZERO-PHASE HJD2457023.218; GROUP 07, 01, 02, 03, 04, 05, 06, 08 WITHIN 12D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 VFTS352 COS/NUV ACQ/IMA PSA MIRRORB 1 5.3 S (5.3 PHASE 0.715 TO 0.745 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 VFTS352 COS/FUV TIME-TA PSA G130M 1291 FP-POS=2, BUFFER-TIME=350 1 450 S (450 G S) ------------------------------------------------------------------------------------------------------------------------------------ 3 VFTS352 COS/FUV TIME-TA PSA G130M 1291 FP-POS=4, BUFFER-TIME=350 1 450 S (450 G S) ------------------------------------------------------------------------------------------------------------------------------------ 4 VFTS352 COS/FUV TIME-TA PSA G160M 1611 FP-POS=2, BUFFER-TIME=640 1 750 S (750 G S) ------------------------------------------------------------------------------------------------------------------------------------ 5 VFTS352 COS/FUV TIME-TA PSA G160M 1611 FP-POS=4, BUFFER-TIME=640 1 750 S (750 G S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ VFTS352 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE VFTS352 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G VFTS352 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G VFTS352 4 COS/FUV TIME-TA PSA G160M 1611 none none none none 1 N/A G VFTS352 5 COS/FUV TIME-TA PSA G160M 1611 none none none none 1 N/A G 13806( 3) - 24-Jul-2014 12:40:02 - [ 11] Visit: 08 Visit Requirements: Period 1.124147 D AND ZERO-PHASE HJD2457023.218; GROUP 08, 01, 02, 03, 04, 05, 06, 07 WITHIN 12D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 VFTS352 COS/NUV ACQ/IMA PSA MIRRORB 1 5.3 S (5.3 PHASE 0.840 TO 0.870 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 VFTS352 COS/FUV TIME-TA PSA G130M 1291 FP-POS=1, BUFFER-TIME=350 1 450 S (450 G S) ------------------------------------------------------------------------------------------------------------------------------------ 3 VFTS352 COS/FUV TIME-TA PSA G130M 1291 FP-POS=3, BUFFER-TIME=350 1 450 S (450 G S) ------------------------------------------------------------------------------------------------------------------------------------ 4 VFTS352 COS/FUV TIME-TA PSA G160M 1611 FP-POS=1, BUFFER-TIME=640 1 750 S (750 G S) ------------------------------------------------------------------------------------------------------------------------------------ 5 VFTS352 COS/FUV TIME-TA PSA G160M 1611 FP-POS=3, BUFFER-TIME=640 1 750 S (750 G S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ VFTS352 1 COS/NUV ACQ/IMA PSA MIRRORB none none none none 1 N/A GE VFTS352 2 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G VFTS352 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G VFTS352 4 COS/FUV TIME-TA PSA G160M 1611 none none none none 1 N/A G VFTS352 5 COS/FUV TIME-TA PSA G160M 1611 none none none none 1 N/A G 13806( 3) - 24-Jul-2014 12:40:02 - [ 12] Summary Form for Proposal 13806 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=350, BUFFER-TIME=640, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GROUP 01, 02, 03, 04, 05, 06, 07, 08 WITHIN 12D, GROUP 02, 01, 03, 04, 05, 06, 07, 08 WITHIN 12D, GROUP 03, 01, 02, 04, 05, 06, 07, 08 WITHIN 12D, GROUP 04, 01, 02, 03, 05, 06, 07, 08 WITHIN 12D, GROUP 05, 01, 02, 03, 04, 06, 07, 08 WITHIN 12D, GROUP 06, 01, 02, 03, 04, 05, 07, 08 WITHIN 12D, GROUP 07, 01, 02, 03, 04, 05, 06, 08 WITHIN 12D, GROUP 08, 01, 02, 03, 04, 05, 06, 07 WITHIN 12D, PHASE 0.09 TO 0.12, PHASE 0.215 TO 0.245, PHASE 0.340 TO 0.37, PHASE 0.465 TO 0.495, PHASE 0.59 TO 0.62, PHASE 0.715 TO 0.745, PHASE 0.840 TO 0.870, PHASE 0.965 TO 0.995, Period 1.124147 D AND ZERO-PHASE HJD2457023.218 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, G160M, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names VFTS352 ------------------------------------------------------------------------------------------------------------------------------------