15066( 3) - 17-Oct-2017 15:07:17 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15066 Version: 3 Check-in Time: 17-Oct-2017 15:07:17 STScI Edit Number: 0 Title Mapping the structure and kinematics of NGC 1624-2's giant magnetosphere ------------------------------------------------------------------------------------ Type Cycle GO 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Alexandre David-Uraz University of Delaware Y CoI: Dr. Veronique Petit University of Delaware N CoI: Dr. David Cohen Swarthmore College N CoI: Christiana Erba University of Delaware N CoI: Dr. Alexander W. Fullerton Space Telescope Science Institute N CoI: Mr. Zsolt Keszthelyi Royal Military College of Canada N CoI: Dr. Maurice Leutenegger University of Maryland Baltimore County N CoI: Dr. Stanley P. Owocki University of Delaware N CoI: Dr. Jon O. Sundqvist Universitats-Sternwarte Munchen N CoI: Rebecca MacInnis University of Delaware N CoI: Dr. Gregg A. Wade Royal Military College of Canada N CoI: Dr. Nolan R. Walborn Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract We propose to obtain phase-resolved COS observations of the extraordinary magnetic star NGC 1624-2, which has the strongest magnetic field ever detected in an O-type star, by nearly an order of magnitude. Two COS observations, obtained at rotational phases when the magnetic field is closest to pole-on and equator-on, respectively, revealed a remarkable variation of the wind line profiles, caused by the magnetically-imposed break of spherical symmetry in the kinematics, density, and ionization structure of the stellar wind. With 4 new observations, we will now monitor the variation of the UV line profiles over the whole stellar rotation to map the complex structure of NGC 1624-2's enormous magnetosphere, which represents a new regime of extreme wind confinement that will test the limits of the current theory of magnetized stellar winds. ------------------------------------------------------------------------------------ Observations Description ------------------------ Our program requires time-critical observations of NGC 1624-2 at four rotational phases, as described below. For each of these observations, we aim to investigate important photospheric, wind, and magnetospheric features such as N V 1239, 1243 A, Si IV 1393, 1403 A, C IV 1548, 1550 AA, N IV 1718 A. NGC 1624-2, with V=11.77, E(B-V)=0.9, will therefore be optimally observed at the COS medium resolution with the G130M (settings 1223, 1291 A) and G160M (1577, 1623 A) gratings for the maximum available, quasi-uninterrupted wavelength coverage of 1135 - 1798 A (with a small gap at 1214 - 1218 A). Two orbits in each of the four visits at phases 0.26, 0.38, 0.63 and 0.91 will be required, as follows. 15066( 3) - 17-Oct-2017 15:07:17 - [ 2] The visibility period is 57 min. Guide star acquisition consumes 6 min and COS imaging target acquisition another 3 min of the first orbit. COS overheads for the required 4-setting sequence are 5+3=8 min in the first orbit, but only 3 min in the second because a setting change can be done during the occultation. Guide star reacquisition requires only 4 min in the second orbit, and the target acquisition is not repeated. Thus, 40 min remain for G130M exposure in the first orbit, and 50 min for G160M in the second. For a spectral type of O7 and the above photometry, the COS ETC predicts S/N of 26 and 28 per resolution element, respectively, sufficient for our objectives. The ephemeris for NGC 1624-2 is JD = 2455967.0 (+/-10) + 157.99 (+/-0.94) x E (Wade et al. 2012). A tolerance of +-0.05 cycles around the desired phases leads to periodic observational windows of 2 weeks that are consistent with these constraints. ------------------------------------------------------------------------------------ 15066( 3) - 17-Oct-2017 15:07:17 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-1624-2 STAR, OF RA=04H40M37.2800S +/- 0.2", J2000 V = 11.77 DEC=+50D27'41.08" +/- 0.2" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 15066( 3) - 17-Oct-2017 15:07:17 - [ 4] Visit: 01 (Phase 0.26) Visit Requirements: Period 157.99 D AND ZERO-PHASE HJD2455967.0 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 NGC-1624-2 COS/NUV ACQ/IMA BOA MIRRORA 1 86 S (86 PHASE 0.21 TO 0.31 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-1624-2 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=2313, FP-POS=ALL 1 235 S (940 G S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-1624-2 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1343, FP-POS=3 1 470 S (470 G S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-1624-2 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1343, FP-POS=4 1 470 S (470 G S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-1624-2 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=1139, FP-POS=ALL 1 270 S G (1080 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-1624-2 COS/FUV TIME-TA PSA G160M 1623 BUFFER-TIME=1265, FP-POS=ALL 1 270 S G (1080 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-1624-2 1 COS/NUV ACQ/IMA BOA MIRRORA none none none none 1 N/A GE NGC-1624-2 2 COS/FUV TIME-TA PSA G130M 1222 none none none 1 1 N/A G NGC-1624-2 2 COS/FUV TIME-TA PSA G130M 1222 none none none 2 1 N/A G NGC-1624-2 2 COS/FUV TIME-TA PSA G130M 1222 none none none 3 1 N/A G NGC-1624-2 2 COS/FUV TIME-TA PSA G130M 1222 none none none 4 1 N/A G NGC-1624-2 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G NGC-1624-2 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G NGC-1624-2 5 COS/FUV TIME-TA PSA G160M 1577 none none none 1 2 N/A G NGC-1624-2 5 COS/FUV TIME-TA PSA G160M 1577 none none none 2 2 N/A G 15066( 3) - 17-Oct-2017 15:07:17 - [ 5] 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-1624-2 5 COS/FUV TIME-TA PSA G160M 1577 none none none 3 2 N/A G NGC-1624-2 5 COS/FUV TIME-TA PSA G160M 1577 none none none 4 2 N/A G NGC-1624-2 6 COS/FUV TIME-TA PSA G160M 1623 none none none 1 2 N/A G NGC-1624-2 6 COS/FUV TIME-TA PSA G160M 1623 none none none 2 2 N/A G NGC-1624-2 6 COS/FUV TIME-TA PSA G160M 1623 none none none 3 2 N/A G NGC-1624-2 6 COS/FUV TIME-TA PSA G160M 1623 none none none 4 2 N/A G 15066( 3) - 17-Oct-2017 15:07:17 - [ 6] Visit: 02 (Phase 0.38) Visit Requirements: Period 157.99 D AND ZERO-PHASE HJD2455967.0 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 NGC-1624-2 COS/NUV ACQ/IMA BOA MIRRORA 1 86 S (86 PHASE 0.33 TO 0.43 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-1624-2 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=2313, FP-POS=ALL 1 235 S (940 G S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-1624-2 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1343, FP-POS=3 1 470 S (470 G S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-1624-2 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1343, FP-POS=4 1 470 S (470 G S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-1624-2 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=1139, FP-POS=ALL 1 270 S G (1080 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-1624-2 COS/FUV TIME-TA PSA G160M 1623 BUFFER-TIME=1265, FP-POS=ALL 1 270 S G (1080 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-1624-2 1 COS/NUV ACQ/IMA BOA MIRRORA none none none none 1 N/A GE NGC-1624-2 2 COS/FUV TIME-TA PSA G130M 1222 none none none 1 1 N/A G NGC-1624-2 2 COS/FUV TIME-TA PSA G130M 1222 none none none 2 1 N/A G NGC-1624-2 2 COS/FUV TIME-TA PSA G130M 1222 none none none 3 1 N/A G NGC-1624-2 2 COS/FUV TIME-TA PSA G130M 1222 none none none 4 1 N/A G NGC-1624-2 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G NGC-1624-2 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G NGC-1624-2 5 COS/FUV TIME-TA PSA G160M 1577 none none none 1 2 N/A G NGC-1624-2 5 COS/FUV TIME-TA PSA G160M 1577 none none none 2 2 N/A G 15066( 3) - 17-Oct-2017 15:07:17 - [ 7] 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-1624-2 5 COS/FUV TIME-TA PSA G160M 1577 none none none 3 2 N/A G NGC-1624-2 5 COS/FUV TIME-TA PSA G160M 1577 none none none 4 2 N/A G NGC-1624-2 6 COS/FUV TIME-TA PSA G160M 1623 none none none 1 2 N/A G NGC-1624-2 6 COS/FUV TIME-TA PSA G160M 1623 none none none 2 2 N/A G NGC-1624-2 6 COS/FUV TIME-TA PSA G160M 1623 none none none 3 2 N/A G NGC-1624-2 6 COS/FUV TIME-TA PSA G160M 1623 none none none 4 2 N/A G 15066( 3) - 17-Oct-2017 15:07:17 - [ 8] Visit: 03 (Phase 0.63) Visit Requirements: Period 157.99 D AND ZERO-PHASE HJD2455967.0 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 NGC-1624-2 COS/NUV ACQ/IMA BOA MIRRORA 1 86 S (86 PHASE 0.58 TO 0.68 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-1624-2 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=2313, FP-POS=ALL 1 235 S (940 G S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-1624-2 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1343, FP-POS=3 1 470 S (470 G S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-1624-2 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1343, FP-POS=4 1 470 S (470 G S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-1624-2 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=1139, FP-POS=ALL 1 270 S G (1080 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-1624-2 COS/FUV TIME-TA PSA G160M 1623 BUFFER-TIME=1265, FP-POS=ALL 1 270 S G (1080 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-1624-2 1 COS/NUV ACQ/IMA BOA MIRRORA none none none none 1 N/A GE NGC-1624-2 2 COS/FUV TIME-TA PSA G130M 1222 none none none 1 1 N/A G NGC-1624-2 2 COS/FUV TIME-TA PSA G130M 1222 none none none 2 1 N/A G NGC-1624-2 2 COS/FUV TIME-TA PSA G130M 1222 none none none 3 1 N/A G NGC-1624-2 2 COS/FUV TIME-TA PSA G130M 1222 none none none 4 1 N/A G NGC-1624-2 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G NGC-1624-2 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G NGC-1624-2 5 COS/FUV TIME-TA PSA G160M 1577 none none none 1 2 N/A G NGC-1624-2 5 COS/FUV TIME-TA PSA G160M 1577 none none none 2 2 N/A G 15066( 3) - 17-Oct-2017 15:07:17 - [ 9] 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-1624-2 5 COS/FUV TIME-TA PSA G160M 1577 none none none 3 2 N/A G NGC-1624-2 5 COS/FUV TIME-TA PSA G160M 1577 none none none 4 2 N/A G NGC-1624-2 6 COS/FUV TIME-TA PSA G160M 1623 none none none 1 2 N/A G NGC-1624-2 6 COS/FUV TIME-TA PSA G160M 1623 none none none 2 2 N/A G NGC-1624-2 6 COS/FUV TIME-TA PSA G160M 1623 none none none 3 2 N/A G NGC-1624-2 6 COS/FUV TIME-TA PSA G160M 1623 none none none 4 2 N/A G 15066( 3) - 17-Oct-2017 15:07:17 - [ 10] Visit: 04 (Phase 0.91) Visit Requirements: Period 157.99 D AND ZERO-PHASE HJD2455967.0 On Hold Comments: Additional Comments: To be observed preferably once the transition to LP4 is done so that all 4 visits are accomplished with the same settings 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 NGC-1624-2 COS/NUV ACQ/IMA BOA MIRRORA 1 86 S (86 PHASE 0.86 TO 0.96 GE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-1624-2 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=2313, FP-POS=ALL 1 235 S (940 G S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-1624-2 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1343, FP-POS=3 1 470 S (470 G S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-1624-2 COS/FUV TIME-TA PSA G130M 1291 BUFFER-TIME=1343, FP-POS=4 1 470 S (470 G S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-1624-2 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=1139, FP-POS=ALL 1 270 S G (1080 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-1624-2 COS/FUV TIME-TA PSA G160M 1623 BUFFER-TIME=1265, FP-POS=ALL 1 270 S G (1080 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-1624-2 1 COS/NUV ACQ/IMA BOA MIRRORA none none none none 1 N/A GE NGC-1624-2 2 COS/FUV TIME-TA PSA G130M 1222 none none none 1 1 N/A G NGC-1624-2 2 COS/FUV TIME-TA PSA G130M 1222 none none none 2 1 N/A G NGC-1624-2 2 COS/FUV TIME-TA PSA G130M 1222 none none none 3 1 N/A G NGC-1624-2 2 COS/FUV TIME-TA PSA G130M 1222 none none none 4 1 N/A G NGC-1624-2 3 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G NGC-1624-2 4 COS/FUV TIME-TA PSA G130M 1291 none none none none 1 N/A G NGC-1624-2 5 COS/FUV TIME-TA PSA G160M 1577 none none none 1 2 N/A G 15066( 3) - 17-Oct-2017 15:07:17 - [ 11] 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC-1624-2 5 COS/FUV TIME-TA PSA G160M 1577 none none none 2 2 N/A G NGC-1624-2 5 COS/FUV TIME-TA PSA G160M 1577 none none none 3 2 N/A G NGC-1624-2 5 COS/FUV TIME-TA PSA G160M 1577 none none none 4 2 N/A G NGC-1624-2 6 COS/FUV TIME-TA PSA G160M 1623 none none none 1 2 N/A G NGC-1624-2 6 COS/FUV TIME-TA PSA G160M 1623 none none none 2 2 N/A G NGC-1624-2 6 COS/FUV TIME-TA PSA G160M 1623 none none none 3 2 N/A G NGC-1624-2 6 COS/FUV TIME-TA PSA G160M 1623 none none none 4 2 N/A G 15066( 3) - 17-Oct-2017 15:07:17 - [ 12] Summary Form for Proposal 15066 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures BOA, PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1139, BUFFER-TIME=1265, BUFFER-TIME=1343, BUFFER-TIME=2313, FP-POS=3, FP-POS=4, FP-POS=ALL ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PHASE 0.21 TO 0.31, PHASE 0.33 TO 0.43, PHASE 0.58 TO 0.68, PHASE 0.86 TO 0.96, Period 157.99 D AND ZERO-PHASE HJD2455967.0 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, G160M, MIRRORA ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC-1624-2 ------------------------------------------------------------------------------------------------------------------------------------