10183( 2) - 04/30/04 11:37 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 10183 Version: 2 Check-in Date: 30-Apr-2004 15:34:50 1.Proposal Title: A Deep Far-UV Search for the Interacting Binary Population in M80 ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle 4. Parallel Pointing Tolerance GO 13 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Dr. Christian Knigge University of Southampton CoI: Dr. David R. Zurek American Museum of Natural History N CoI: Dr. Michael Shara American Museum of Natural History N CoI: Dr. Knox S. Long Space Telescope Science Institute N CoI: Dr. Andrea Dieball University of Southampton N ------------------------------------------------------------------------------------ 6. Abstract We propose to carry out a deep, far-ultraviolet (FUV), time-resolved survey for cataclysmic variables (CVs) and other dynamically-formed objects in the globular cluster (GC) M80. This will include a search for FUV counterparts to the 17 Chandra sources in our field of view, which include 2 LMXBs and 5 X-ray selected CV candidates. Our goal is to confirm these sources as interacting binaries and find any additional CVs below the Chandra detection limit. We will achieve this with 6 orbits of FUV imaging with the ACS/SB, plus one additional orbit of NUV imaging with ACS/HRC. Since crowding is not a problem in the FUV, this will yield time-resolved FUV photometry of all blue objects in the cluster core. Our CV census will be both deep enough to be essentially complete and ``broad'' enough to involve all of the following CV characteristics: (1) UV brightness; (2) blue FUV spectral shape; (3) strong CIV and HeII emission; (4) short time-scale ($\sim$ minutes) variability (flickering, WD spin); (6) intermediate time-scale ($\sim$ hours) variability (orbital variations); (7) long time-scale ($\sim$ weeks) variability (dwarf nova eruptions). We will thus uncover the interacting binary population in M80. In addition, our survey will detect numerous blue stragglers and hot white dwarfs, as well as any other blue objects in the central regions of this cluster. ------------------------------------------------------------------------------------ 10183( 2) - 04/30/04 11:37 - [ 2] Observations Description ------------------------ Our observing strategy is designed to be sensitive to all of the CV characteristics. In order to achieve this, our observations must (i) go deep enough in the FUV to detect CVs; (ii) reliably reveal FUV excess sources; (iii) provide information on the FUV spectral slope of our FUV sources; (iv) permit the detection of strong UV emission lines; (v) be sensitive to variability on time-scales from minutes to months. We can achieve all of these goals with only 7 HST orbits, spread over 4 visits. The first visit will consist of 4 consecutive HST orbits and will be spent exclusively on FUV imaging with the ACS/SBC/F165LP detector/filter combination. The second and third visit will also be used for FUV imaging with ACS/SBC, but using the F140LP and F150LP filters, respectively. The fourth and final visit will be used to obtain NUV imaging using ACS/HRC/F250W. The four epochs will be spaced at intervals of at least a few weeks to ensure coverage of typical DNe interoutburst time-scales. We finally note that we have used the existing WFPC2/F160BW images in the archive to verify that there are no FUV bright sources in our field of view that might violate the ACS/SBC brightness limits in our FUV filters. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- As noted above there exists in the archive WFPC2/F160BW images of M80 which have been used to ensure that no bright sources would exceed the brightness limits of the ACS/SBC. ------------------------------------------------------------------------------------ 10183( 2) - 04/30/04 11:37 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 M80 STELLAR CLUSTER, RA=16H17M2.5S +/- 0.1", DEC=- J2000 V = 24.0 GLOBULAR CLUSTER 22D58'30.0" +/- 0.1" Coordinate Source: HST_IMAGE 10183( 2) - 04/30/04 11:37 - [ 4] Visit: 01 Visit Priority: Visit Requirements: PCS MODE FINE 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 M80 ACS/SBC ACCUM SBC-FIX F165LP 8 310 S ------------------------------------------------------------------------------------------------------------------------------------ 2 M80 ACS/SBC ACCUM SBC-FIX F165LP 8 323 S ------------------------------------------------------------------------------------------------------------------------------------ 3 M80 ACS/SBC ACCUM SBC-FIX F165LP 8 323 S ------------------------------------------------------------------------------------------------------------------------------------ 4 M80 ACS/SBC ACCUM SBC-FIX F165LP 8 323 S ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 01 1 none none 1 none 1 tbd 01 1 none none 2 none 1 tbd 01 1 none none 3 none 1 tbd 01 1 none none 4 none 1 tbd 01 1 none none 5 none 1 tbd 01 1 none none 6 none 1 tbd 01 1 none none 7 none 1 tbd 01 1 none none 8 none 1 tbd 01 2 none none 1 none 2 tbd 01 2 none none 2 none 2 tbd 01 2 none none 3 none 2 tbd 01 2 none none 4 none 2 tbd 01 2 none none 5 none 2 tbd 01 2 none none 6 none 2 tbd 01 2 none none 7 none 2 tbd 01 2 none none 8 none 2 tbd 01 3 none none 1 none 3 tbd 01 3 none none 2 none 3 tbd 01 3 none none 3 none 3 tbd 01 3 none none 4 none 3 tbd 01 3 none none 5 none 3 tbd 01 3 none none 6 none 3 tbd 01 3 none none 7 none 3 tbd 01 3 none none 8 none 3 tbd 01 4 none none 1 none 4 tbd 01 4 none none 2 none 4 tbd 01 4 none none 3 none 4 tbd 10183( 2) - 04/30/04 11:37 - [ 5] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 01 4 none none 4 none 4 tbd 01 4 none none 5 none 4 tbd 01 4 none none 6 none 4 tbd 01 4 none none 7 none 4 tbd 01 4 none none 8 none 4 tbd 10183( 2) - 04/30/04 11:37 - [ 6] Visit: 02 Visit Priority: Visit Requirements: SAME ORIENT AS 01; AFTER 01 BY 6 D TO 14 D On Hold Comments: Additional Comments: This visit should occur 1 to 2 weeks after visit 1. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 M80 ACS/SBC ACCUM SBC-FIX F150LP 8 310 S ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 02 1 none none 1 none 1 tbd 02 1 none none 2 none 1 tbd 02 1 none none 3 none 1 tbd 02 1 none none 4 none 1 tbd 02 1 none none 5 none 1 tbd 02 1 none none 6 none 1 tbd 02 1 none none 7 none 1 tbd 02 1 none none 8 none 1 tbd 10183( 2) - 04/30/04 11:37 - [ 7] Visit: 03 Visit Priority: Visit Requirements: SAME ORIENT AS 01; AFTER 02 BY 6 D TO 14 D On Hold Comments: Additional Comments: This visit should occur 1 to 2 weeks after visit 2. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 M80 ACS/SBC ACCUM SBC-FIX F140LP 8 310 S ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 03 1 none none 1 none 1 tbd 03 1 none none 2 none 1 tbd 03 1 none none 3 none 1 tbd 03 1 none none 4 none 1 tbd 03 1 none none 5 none 1 tbd 03 1 none none 6 none 1 tbd 03 1 none none 7 none 1 tbd 03 1 none none 8 none 1 tbd 10183( 2) - 04/30/04 11:37 - [ 8] Visit: 04 Visit Priority: Visit Requirements: SAME ORIENT AS 01; AFTER 03 BY 6 D TO 14 D On Hold Comments: Additional Comments: This visit should occur 1 to 2 weeks after visit 3. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 M80 ACS/HRC ACCUM HRC-FIX F250W GAIN=2,CR-SPLIT=8 1 2384 S ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 04 1 none none none 1 1 tbd 04 1 none none none 2 1 tbd 04 1 none none none 3 1 tbd 04 1 none none none 4 1 tbd 04 1 none none none 5 1 tbd 04 1 none none none 6 1 tbd 04 1 none none none 7 1 tbd 04 1 none none none 8 1 tbd 10183( 2) - 04/30/04 11:37 - [ 9] Summary Form for Proposal 10183 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures SBC-FIX HRC-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/SBC ACS/HRC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters GAIN=2 CR-SPLIT=8 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PCS MODE FINE SAME ORIENT AS 01; AFTER 01 BY 6 D TO 14 D SAME ORIENT AS 01; AFTER 02 BY 6 D TO 14 D SAME ORIENT AS 01; AFTER 03 BY 6 D TO 14 D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F165LP F150LP F140LP F250W ------------------------------------------------------------------------------------------------------------------------------------ Target Names M80 ------------------------------------------------------------------------------------------------------------------------------------