6026( 11) - 12/10/96 15:18 - [ 0] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6026 Version: 11 Check-in Date: 10-Dec-1996 15:12:50 1.Proposal Title: Structure and evolution of the globular cluster low mass X-ray binary AC211 in M15 ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Hot Stars GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Tim Naylor Keele University CoI: Lydie Koch-Miramond CEN SACLAY N CoI: Michel Auriere Observatoire de Pic-du-Midi N CoI: Phil Charles University of Oxford N CoI: Sergio Ilovaisky Observatoire de Haute Provence N CoI: Claude Chevalier Observatoire de Haute Provence N CoI: Jan van Paradijs University of Amsterdam N CoI: Bruce Margon University of Washington N ------------------------------------------------------------------------------------ 6. Abstract AC211 is optically the brightest counterpart of any globular cluster X-ray binary, and one of the brightest amongst all LMXBs. Given its large UV excess and high orbital inclination (evident from its large UV eclipse) this object is a prime target for HST. We are proposing to carry out phase resolved spectrophotometry of AC211 using the temporal and UV spectral resolutions offered by the FOS. We will model the observed eclipses to define the mechanism responsible for the optical and UV luminosity of this system. This is widely believed to be the heating of the accretion disc by X-rays from the corona. A large flux of X-rays scattered down onto the disc produces a large UV luminosity, and thus a flatter radial disc temperature distribution than pure accretion. The behaviour of the spectral lines with orbital phase will allow us to define the geometry of the wind and the accretion disc. The optical line profiles already infer significant mass loss, implying that the UV resonance lines will show phase modulated P Cyg profiles. From these we can estimate the mass loss rate, and hence the mass transfer and wind mechanisms which are related to the evolutionary state of the binary (predicted to be unique to globular clusters). Only with Space Telescope will we be able to obtain line profiles and continuum measurements which are uncontaminated by light from other cluster members. The results have implications for LMXBs in general and globular cluster X-ray sources in particular. ------------------------------------------------------------------------------------ Observations Description ------------------------ All our exposures are with the FOS 0.3 arcsec aperture, and so require 3 orbits per visit to get the target into the aperture. Our requirement is then for the following. 1) Four orbits with FOS/RD + PRISM to carry out our eclipse modelling making a total of 7 orbits for the eclipse visit. 2) We also wish to cover an entire orbit interleaving G130H and G190H exposures, obtaining one exposure in each grating. Some of these exposures will cover eclipse, and so their continuum measurements will be used to extend our wavelength range available for eclipse modelling. To obtain a complete orbital cycle will require 10 orbits, which will have to be split into two groups of 5 orbits if no one observation is to be more than 9 orbits. Thus we require a further 16 orbits for the complete orbital cycle. 0.3cm Signal-to-noise 0.1cm 1) G190H. In our IUE spectra the HeII 1640A has a peak flux of about 1 * 10^-14 ergs cm^-2 s^-1 ang^-1. A 10 minute integration will provide a signal-to-noise of about 20. 2) G130H. After HeII the next strongest line we expect to see is either CIV or NV. From our IUE spectra we can place an upper limit of about 0.5 * 10^-14 ergs cm^-2 s^-1 ang^-1 at peak. After obtaining the G190H spectrum, and allowing for overheads, we will probably be left with about 30 minutes of unocculted time pre orbit for the G130H. This would yield a signal-to-noise of about 10 at CIV. 3) PRISM. In four minutes the prism will give a peak signal-to -noise of about 100 and should yield usable data (S:N of 10) right down to the short wavelength limit. Real Time Justification ----------------------- The eclipse visit will clearly have to be time critical. if a complete orbital cycle cove be covered in 1 visit (takes 13 orbits) then it would not be time critical (and would save us 3 orbits in setup time). If the observation has to be split, however, the scheduling would have to be such as to ensure the two observations covered separate parts of the orbital cycle. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: Email: , ------------------------------------------------------------------------------------ 6026( 11) - 12/10/96 15:18 - [ 1] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC7078- STAR RA=21H 29M 56.556S +/- J2000 V = 14.1+/-0.2 OFFSET 0.01S,DEC=12D 10' 7.270" +/- U-V = 1.3+/-0.2 0.1",PLATE-ID=02V2 Comments: Offset star. Position updated based on early-acq WF/PC image obtained in prior cycle 3 proposal. 2 NGC7078-STAR STAR,LMXB RA-OFF=1.796S+/- 0.01S,DEC-OFF=- J2000 V = 17.0+/-0.2 3.879"+/- 0.1",FROM 1 B-V = +0.4+/-0.2 V = 15.0+/-0.2 Comments: Variable star. Position updated based on early-acq WF/PC image obtained in prior cycle 3 proposal. 6026( 11) - 12/10/96 15:18 - [ 2] Visit: 01 Visit Requirements: PERIOD 0.713014 D AND ZERO-PHASE JD2447790.963000 PCS MODE FINE On Hold Comments: Additional Comments: Ephemeris from Ilovaisky et al A&A 270, 139. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC7078-OFF FOS/BL ACQ/PEA 4.3 G570H SCAN-STEP-Y=1.23,SEARCH-SIZE-X=1, 1 5 S ONBOARD ACQ FOR 20 SET K SEARCH-SIZE-Y=3 Comments: Acquisition pattern A1 ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC7078-OFF FOS/BL ACQ/PEA 1.0-PAI G570H SCAN-STEP-X=0.61,SCAN-STEP-Y=0.61 1 5 S ONBOARD ACQ FOR 30 SET K R-A ,SEARCH-SIZE-X=6,SEARCH-SIZE-Y=2 Comments: Acquisition pattern B1 ------------------------------------------------------------------------------------------------------------------------------------ 30 NGC7078-OFF FOS/BL ACQ/PEA 0.5-PAI G400H SCAN-STEP-X=0.29,SCAN-STEP-Y=0.29 1 5 S ONBOARD ACQ FOR 40 SET K R-A ,SEARCH-SIZE-X=3,SEARCH-SIZE-Y=3 Comments: Acquisition pattern D1, as used by Bruce, though a C1 might do as well. ------------------------------------------------------------------------------------------------------------------------------------ 40 NGC7078-OFF FOS/BL ACQ/PEA 0.25-PA G400H SCAN-STEP-X=0.172, 1 5 S ONBOARD ACQ FOR 50 SET K IR-A SCAN-STEP-Y=0.172,SEARCH-SIZE-X=3 ,SEARCH-SIZE-Y=3 ------------------------------------------------------------------------------------------------------------------------------------ 50 NGC7078-STA FOS/BL ACQ/PEA 0.25-PA G270H SCAN-STEP-X=0.172, 1 5 S ONBOARD ACQ FOR 60 R K IR-A SCAN-STEP-Y=0.172,SEARCH-SIZE-X=3 ,SEARCH-SIZE-Y=3 ------------------------------------------------------------------------------------------------------------------------------------ 55 NGC7078-STA FOS/BL ACQ/PEA 0.25-PA G270H SCAN-STEP-X=0.052, 1 5 S ONBOARD ACQ FOR 60-230 R K IR-A SCAN-STEP-Y=0.052,SEARCH-SIZE-X=5 ,SEARCH-SIZE-Y=5 ------------------------------------------------------------------------------------------------------------------------------------ 60 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 601 S PHASE 0.70 TO 0.80 R R-A Comments: First exposure in an orbit. Should be NON-INT with 7 and 8 but can't be done with a PHASE requirement. ------------------------------------------------------------------------------------------------------------------------------------ 70 NGC7078-STA FOS/BL ACCUM 0.5-PAI G190H STEP-PATT=SINGLE 1 9 M SEQ 70-80 NON-INT EXPAND R R-A MAX DUR 20 M MIN DUR 3 M Comments: Middle exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 80 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 70-80 NON-INT R R-A Comments: Last exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 90 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 90-110 NON-INT R R-A Comments: First exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 100 NGC7078-STA FOS/BL ACCUM 0.5-PAI G190H STEP-PATT=SINGLE 1 9 M SEQ 90-110 NON-INT EXPAND R R-A MAX DUR 20 M MIN DUR 3 M Comments: Middle exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 6026( 11) - 12/10/96 15:18 - [ 3] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 110 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 90-110 NON-INT R R-A Comments: Last exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 120 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 120-140 NON-INT R R-A Comments: First exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 130 NGC7078-STA FOS/BL ACCUM 0.5-PAI G190H STEP-PATT=SINGLE 1 9 M SEQ 120-140 NON-INT R R-A EXPAND MAX DUR 20 M MIN DUR 3 M Comments: Middle exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 140 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 120-140 NON-INT R R-A Comments: Last exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 150 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 150-170 NON-INT R R-A Comments: First exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 160 NGC7078-STA FOS/BL ACCUM 0.5-PAI G190H STEP-PATT=SINGLE 1 9 M SEQ 150-170 NON-INT R R-A EXPAND MAX DUR 20 M MIN DUR 3 M Comments: Middle exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 170 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 150-170 NON-INT R R-A Comments: Last exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 180 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 180-200 NON-INT R R-A Comments: First exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 190 NGC7078-STA FOS/BL ACCUM 0.5-PAI G190H STEP-PATT=SINGLE 1 9 M SEQ 180-200 NON-INT R R-A EXPAND MAX DUR 20 M MIN DUR 3 M Comments: Middle exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 200 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 180-200 NON-INT R R-A Comments: Last exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 210 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 210-230 NON-INT R R-A Comments: First exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 220 NGC7078-STA FOS/BL ACCUM 0.5-PAI G190H STEP-PATT=SINGLE 1 9 M SEQ 210-230 NON-INT R R-A EXPAND MAX DUR 20 M MIN DUR 3 M Comments: Middle exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 6026( 11) - 12/10/96 15:18 - [ 4] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 230 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 210-230 NON-INT R R-A Comments: Last exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 6026( 11) - 12/10/96 15:18 - [ 5] Visit: 02 Visit Requirements: PERIOD 0.713014 D AND ZERO-PHASE JD2447790.963000 PCS MODE FINE On Hold Comments: Additional Comments: Ephemeris from Ilovaisky et al A&A 270, 139. This visit is a repeat for visit 1 which failed due to guide star acquisition failure. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC7078-OFF FOS/BL ACQ/PEA 4.3 G570H SCAN-STEP-Y=1.23,SEARCH-SIZE-X=1, 1 5 S ONBOARD ACQ FOR 20 SET K SEARCH-SIZE-Y=3 Comments: Acquisition pattern A1 ------------------------------------------------------------------------------------------------------------------------------------ 20 NGC7078-OFF FOS/BL ACQ/PEA 1.0-PAI G570H SCAN-STEP-X=0.61,SCAN-STEP-Y=0.61 1 5 S ONBOARD ACQ FOR 30 SET K R-A ,SEARCH-SIZE-X=6,SEARCH-SIZE-Y=2 Comments: Acquisition pattern B1 ------------------------------------------------------------------------------------------------------------------------------------ 30 NGC7078-OFF FOS/BL ACQ/PEA 0.5-PAI G400H SCAN-STEP-X=0.29,SCAN-STEP-Y=0.29 1 5 S ONBOARD ACQ FOR 40 SET K R-A ,SEARCH-SIZE-X=3,SEARCH-SIZE-Y=3 Comments: Acquisition pattern D1, as used by Bruce, though a C1 might do as well. ------------------------------------------------------------------------------------------------------------------------------------ 40 NGC7078-OFF FOS/BL ACQ/PEA 0.25-PA G400H SCAN-STEP-X=0.172, 1 5 S ONBOARD ACQ FOR 50 SET K IR-A SCAN-STEP-Y=0.172,SEARCH-SIZE-X=3 ,SEARCH-SIZE-Y=3 ------------------------------------------------------------------------------------------------------------------------------------ 50 NGC7078-STA FOS/BL ACQ/PEA 0.25-PA G270H SCAN-STEP-X=0.172, 1 5 S ONBOARD ACQ FOR 60 R K IR-A SCAN-STEP-Y=0.172,SEARCH-SIZE-X=3 ,SEARCH-SIZE-Y=3 ------------------------------------------------------------------------------------------------------------------------------------ 55 NGC7078-STA FOS/BL ACQ/PEA 0.25-PA G270H SCAN-STEP-X=0.052, 1 5 S ONBOARD ACQ FOR 60-230 R K IR-A SCAN-STEP-Y=0.052,SEARCH-SIZE-X=5 ,SEARCH-SIZE-Y=5 ------------------------------------------------------------------------------------------------------------------------------------ 60 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 601 S PHASE 0.70 TO 0.80 SEQ R R-A 60-80 NON-INT Comments: First exposure in an orbit. ------------------------------------------------------------------------------------------------------------------------------------ 70 NGC7078-STA FOS/BL ACCUM 0.5-PAI G190H STEP-PATT=SINGLE 1 9 M EXPAND MAX DUR 20 M MIN R R-A DUR 3 M Comments: Middle exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 80 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 70-80 NON-INT R R-A Comments: Last exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 90 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 90-110 NON-INT R R-A Comments: First exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 100 NGC7078-STA FOS/BL ACCUM 0.5-PAI G190H STEP-PATT=SINGLE 1 9 M SEQ 90-110 NON-INT EXPAND R R-A MAX DUR 20 M MIN DUR 3 M Comments: Middle exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 6026( 11) - 12/10/96 15:18 - [ 6] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 110 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 90-110 NON-INT R R-A Comments: Last exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 120 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 120-140 NON-INT R R-A Comments: First exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 130 NGC7078-STA FOS/BL ACCUM 0.5-PAI G190H STEP-PATT=SINGLE 1 9 M SEQ 120-140 NON-INT R R-A EXPAND MAX DUR 20 M MIN DUR 3 M Comments: Middle exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 140 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 120-140 NON-INT R R-A Comments: Last exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 150 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 150-170 NON-INT R R-A Comments: First exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 160 NGC7078-STA FOS/BL ACCUM 0.5-PAI G190H STEP-PATT=SINGLE 1 9 M SEQ 150-170 NON-INT R R-A EXPAND MAX DUR 20 M MIN DUR 3 M Comments: Middle exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 170 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 150-170 NON-INT R R-A Comments: Last exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 180 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 180-200 NON-INT R R-A Comments: First exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 190 NGC7078-STA FOS/BL ACCUM 0.5-PAI G190H STEP-PATT=SINGLE 1 9 M SEQ 180-200 NON-INT R R-A EXPAND MAX DUR 20 M MIN DUR 3 M Comments: Middle exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 200 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 180-200 NON-INT R R-A Comments: Last exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 210 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 210-230 NON-INT R R-A Comments: First exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 220 NGC7078-STA FOS/BL ACCUM 0.5-PAI G190H STEP-PATT=SINGLE 1 9 M SEQ 210-230 NON-INT R R-A EXPAND MAX DUR 20 M MIN DUR 3 M Comments: Middle exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 6026( 11) - 12/10/96 15:18 - [ 7] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 230 NGC7078-STA FOS/BL ACCUM 0.5-PAI G160L STEP-PATT=SINGLE 1 10 M SEQ 210-230 NON-INT R R-A Comments: Last exposure in an orbit ------------------------------------------------------------------------------------------------------------------------------------ 6026( 11) - 12/10/96 15:18 - [ 8] Summary Form for Proposal 6026 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOS/BL ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/PEAK ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SCAN-STEP-Y=1.23 SEARCH-SIZE-X=1 SEARCH-SIZE-Y=3 SEARCH-SIZE-Y=2 SEARCH-SIZE-X=3 SCAN-STEP-Y=0.172 SCAN-STEP-X=0.172 SEARCH-SIZE-Y=5 STEP-PATT=SINGLE SEARCH-SIZE-X=6 SCAN-STEP-Y=0.29 SEARCH-SIZE-X=5 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Hot Stars ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PERIOD 0.713014 D AND ZERO-PHASE JD2447790.963000 PCS MODE FINE ONBOARD ACQ FOR 20 ONBOARD ACQ FOR 30 ONBOARD ACQ FOR 40 ONBOARD ACQ FOR 50 ONBOARD ACQ FOR 60 ONBOARD ACQ FOR 60-230 PHASE 0.70 TO 0.80 SEQ 70-80 NON-INT EXPAND MAX DUR 20 M MIN DUR 3 M SEQ 70-80 NON-INT SEQ 90-110 NON-INT SEQ 90-110 NON-INT EXPAND MAX DUR 20 M MIN DUR 3 M SEQ 120-140 NON-INT SEQ 120-140 NON-INT EXPAND MAX DUR 20 M MIN DUR 3 M SEQ 150-170 NON-INT SEQ 150-170 NON-INT EXPAND MAX DUR 20 M MIN DUR 3 M SEQ 180-200 NON-INT SEQ 180-200 NON-INT EXPAND MAX DUR 20 M MIN DUR 3 M SEQ 210-230 NON-INT SEQ 210-230 NON-INT EXPAND MAX DUR 20 M MIN DUR 3 M PHASE 0.70 TO 0.80 SEQ 60-80 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G570H G400H G270H G160L G190H ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC7078-OFFSET NGC7078-STAR ------------------------------------------------------------------------------------------------------------------------------------