12747( 5) - 30-Aug-2012 13:39:07 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12747 Version: 5 Check-in Time: 30-Aug-2012 13:39:07 STScI Edit Number: 2 Title Constraining the irradiated disk and the nature of the companion star in an ultraluminous X-ray source ------------------------------------------------------------------------------------ Type Cycle GO 19 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Fabien Grise Instituto de Astrofisica de Canarias Y CoI: Dr. Philip Kaaret University of Iowa N CoI: Dr. Hua Feng Tsinghua University N CoI: Ms. Lian Tao Tsinghua University N CoI: Prof. Stephane Corbel Commissariat a l'Energie Atomique (CEA) N ------------------------------------------------------------------------------------ Abstract Previous HST observations of the ultraluminous X-ray source Holmberg IX X-1 show that its optical emission may be dominated at short wavelengths by an irradiated accretion disk and at long wavelengths by a late-type (super)giant star which would be the donor star in the system. This makes of Holmberg IX X-1 one of the few ULXs where we have a direct, observational hint about the presence of a companion star. We propose X-ray and UV to NIR observations with Chandra and HST/WFC3. The X-ray spectrum will be essential at modeling the disk emission and, combined with UV/optical measurements, will allow us to constrain the irradiation in the disk. Longer wavelengths will enable us to definitely identify the red excess emission as coming from the donor star or from some structure from the disk. ------------------------------------------------------------------------------------ Observations Description ------------------------ The observations consist of one simultaneous Chandra/HST observation. We will observe using the WFC3/UVIS instrument in the F225W, F336W, F438W, F547M, F621M, F689M, F763M, F845M filters. We will also make use of WFC3/IR to perform observations in the F098M, F125W and F160W filters. Real Time Justification ----------------------- Holmberg IX X-1 is known to be variable in X-rays and in the optical, on timescales of days (and less). Thus, for a reliable modeling of the spectral energy distribution, we need the HST observations to be simultaneous with the 15 ks Chandra observation (Chandra proposal 13400775). Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12747( 5) - 30-Aug-2012 13:39:07 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HOLMBERGIX-X EXT-STAR, ACCRETION RA=09H57M53.3000S +/- 0.7", J2000 V = 22.6 +/- 0.1 1 DISK DEC=+69D03'48.10" +/- 0.7" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 12747( 5) - 30-Aug-2012 13:39:07 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE-3PT Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.135 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BOX-MIN Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.572 Line_Spacing 0.365 Coordinate_Frame POS-TARG Pattern_Orient 18.528 Angle_Between_Sides 74.653 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 12747( 5) - 30-Aug-2012 13:39:07 - [ 4] Visit: 01 Visit Requirements: On Hold Comments: Additional Comments: This visit should be scheduled to occur during the 15, 000 second duration of the corresponding Chandra observation (Chandra Seq: 401413 ObsId: 13728, see Chandra proposal 13400775). Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HOLMBERGIX- WFC3/UVI ACCUM UVIS2-C1K F225W 1 240 S PATTERN 1 1 X1 S 1C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 2 HOLMBERGIX- WFC3/UVI ACCUM UVIS2-C1K F336W 1 90 S PATTERN 1 2 X1 S 1C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 3 HOLMBERGIX- WFC3/UVI ACCUM UVIS2-C1K F438W 1 85 S PATTERN 1 3 X1 S 1C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 4 HOLMBERGIX- WFC3/UVI ACCUM UVIS2-C1K F547M 1 105 S PATTERN 1 4 X1 S 1C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 5 HOLMBERGIX- WFC3/UVI ACCUM UVIS2-C1K F763M 1 230 S PATTERN 1 5 X1 S 1C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 6 HOLMBERGIX- WFC3/UVI ACCUM UVIS2-C1K F845M 1 385 S PATTERN 1 6 X1 S 1C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 7 HOLMBERGIX- WFC3/IR MULTIAC IRSUB512 F125W SAMP-SEQ=STEP25, NSAMP=12 1 DEF PATTERN 2 7 X1 CUM ------------------------------------------------------------------------------------------------------------------------------------ 8 HOLMBERGIX- WFC3/UVI ACCUM UVIS2-C1K F621M 1 130 S PATTERN 1 8 X1 S 1C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 9 HOLMBERGIX- WFC3/UVI ACCUM UVIS2-C1K F689M 1 180 S PATTERN 1 9 X1 S 1C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 10 HOLMBERGIX- WFC3/IR MULTIAC IRSUB512 F098M SAMP-SEQ=STEP25, NSAMP=13 1 DEF PATTERN 2 10 X1 CUM ------------------------------------------------------------------------------------------------------------------------------------ 11 HOLMBERGIX- WFC3/IR MULTIAC IRSUB512 F160W SAMP-SEQ=SPARS25, NSAMP=15 1 DEF PATTERN 2 11 X1 CUM ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 12747( 5) - 30-Aug-2012 13:39:07 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HOLMBERGIX-X1 1 WFC3/UVI ACCUM UVIS2-C1 F225W 1 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 1 WFC3/UVI ACCUM UVIS2-C1 F225W 2 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 1 WFC3/UVI ACCUM UVIS2-C1 F225W 3 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 2 WFC3/UVI ACCUM UVIS2-C1 F336W 1 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 2 WFC3/UVI ACCUM UVIS2-C1 F336W 2 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 2 WFC3/UVI ACCUM UVIS2-C1 F336W 3 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 3 WFC3/UVI ACCUM UVIS2-C1 F438W 1 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 3 WFC3/UVI ACCUM UVIS2-C1 F438W 2 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 3 WFC3/UVI ACCUM UVIS2-C1 F438W 3 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 4 WFC3/UVI ACCUM UVIS2-C1 F547M 1 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 4 WFC3/UVI ACCUM UVIS2-C1 F547M 2 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 4 WFC3/UVI ACCUM UVIS2-C1 F547M 3 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 5 WFC3/UVI ACCUM UVIS2-C1 F763M 1 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 5 WFC3/UVI ACCUM UVIS2-C1 F763M 2 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 5 WFC3/UVI ACCUM UVIS2-C1 F763M 3 none none none 2 N/A S K1C-SUB HOLMBERGIX-X1 6 WFC3/UVI ACCUM UVIS2-C1 F845M 1 none none none 2 N/A S K1C-SUB HOLMBERGIX-X1 6 WFC3/UVI ACCUM UVIS2-C1 F845M 2 none none none 2 N/A S K1C-SUB HOLMBERGIX-X1 6 WFC3/UVI ACCUM UVIS2-C1 F845M 3 none none none 2 N/A S K1C-SUB HOLMBERGIX-X1 7 WFC3/IR MULTIAC IRSUB512 F125W 1 none none none 2 N/A CUM HOLMBERGIX-X1 7 WFC3/IR MULTIAC IRSUB512 F125W 2 none none none 2 N/A CUM HOLMBERGIX-X1 7 WFC3/IR MULTIAC IRSUB512 F125W 3 none none none 2 N/A CUM HOLMBERGIX-X1 7 WFC3/IR MULTIAC IRSUB512 F125W 4 none none none 2 N/A CUM HOLMBERGIX-X1 8 WFC3/UVI ACCUM UVIS2-C1 F621M 1 none none none 2 N/A S K1C-SUB HOLMBERGIX-X1 8 WFC3/UVI ACCUM UVIS2-C1 F621M 2 none none none 2 N/A S K1C-SUB 12747( 5) - 30-Aug-2012 13:39:07 - [ 6] 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 | ------------------------------------------------------------------------------------------------------------------------------------ HOLMBERGIX-X1 8 WFC3/UVI ACCUM UVIS2-C1 F621M 3 none none none 2 N/A S K1C-SUB HOLMBERGIX-X1 9 WFC3/UVI ACCUM UVIS2-C1 F689M 1 none none none 3 N/A S K1C-SUB HOLMBERGIX-X1 9 WFC3/UVI ACCUM UVIS2-C1 F689M 2 none none none 3 N/A S K1C-SUB HOLMBERGIX-X1 9 WFC3/UVI ACCUM UVIS2-C1 F689M 3 none none none 3 N/A S K1C-SUB HOLMBERGIX-X1 10 WFC3/IR MULTIAC IRSUB512 F098M 1 none none none 3 N/A CUM HOLMBERGIX-X1 10 WFC3/IR MULTIAC IRSUB512 F098M 2 none none none 3 N/A CUM HOLMBERGIX-X1 10 WFC3/IR MULTIAC IRSUB512 F098M 3 none none none 3 N/A CUM HOLMBERGIX-X1 10 WFC3/IR MULTIAC IRSUB512 F098M 4 none none none 3 N/A CUM HOLMBERGIX-X1 11 WFC3/IR MULTIAC IRSUB512 F160W 1 none none none 3 N/A CUM HOLMBERGIX-X1 11 WFC3/IR MULTIAC IRSUB512 F160W 2 none none none 3 N/A CUM HOLMBERGIX-X1 11 WFC3/IR MULTIAC IRSUB512 F160W 3 none none none 3 N/A CUM HOLMBERGIX-X1 11 WFC3/IR MULTIAC IRSUB512 F160W 4 none none none 3 N/A CUM 12747( 5) - 30-Aug-2012 13:39:07 - [ 7] Visit: 51 Visit Requirements: On Hold Comments: Additional Comments: This visit should be scheduled to occur during the 15, 000 second duration of the corresponding Chandra observation (Chandra Seq: 401436 ObsId: 14471, see Chandra proposal 13400775). Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HOLMBERGIX- WFC3/UVI ACCUM UVIS2-C1K F225W FLASH=11.0 1 227 S POS TARG +2, null; GS X1 S 1C-SUB ACQ SCENARIO BASE1B3; PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 HOLMBERGIX- WFC3/UVI ACCUM UVIS2-C1K F336W FLASH=12 1 85 S POS TARG +2, null; X1 S 1C-SUB PATTERN 1 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 HOLMBERGIX- WFC3/UVI ACCUM UVIS2-C1K F438W FLASH=11 1 80 S POS TARG +2, null; X1 S 1C-SUB PATTERN 1 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 HOLMBERGIX- WFC3/UVI ACCUM UVIS2-C1K F547M FLASH=10 1 100 S POS TARG +2, null; X1 S 1C-SUB PATTERN 1 4 ------------------------------------------------------------------------------------------------------------------------------------ 5 HOLMBERGIX- WFC3/UVI ACCUM UVIS2-C1K F763M FLASH=9 1 220 S POS TARG +2, null; X1 S 1C-SUB PATTERN 1 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 HOLMBERGIX- WFC3/UVI ACCUM UVIS2-C1K F845M FLASH=8 1 370 S POS TARG +2, null; X1 S 1C-SUB PATTERN 1 6 ------------------------------------------------------------------------------------------------------------------------------------ 7 HOLMBERGIX- WFC3/IR MULTIAC IRSUB512 F125W SAMP-SEQ=STEP25, NSAMP=12 1 DEF POS TARG +2, null; X1 CUM PATTERN 2 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 HOLMBERGIX- WFC3/UVI ACCUM UVIS2-C1K F621M FLASH=10 1 130 S POS TARG +2, null; X1 S 1C-SUB PATTERN 1 8 ------------------------------------------------------------------------------------------------------------------------------------ 9 HOLMBERGIX- WFC3/UVI ACCUM UVIS2-C1K F689M FLASH=9 1 170 S POS TARG +2, null; X1 S 1C-SUB PATTERN 1 9 ------------------------------------------------------------------------------------------------------------------------------------ 10 HOLMBERGIX- WFC3/IR MULTIAC IRSUB512 F098M SAMP-SEQ=STEP25, NSAMP=13 1 DEF POS TARG +2, null; X1 CUM PATTERN 2 10 ------------------------------------------------------------------------------------------------------------------------------------ 11 HOLMBERGIX- WFC3/IR MULTIAC IRSUB512 F160W SAMP-SEQ=SPARS25, NSAMP=15 1 DEF POS TARG +2, null; X1 CUM PATTERN 2 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 | ------------------------------------------------------------------------------------------------------------------------------------ 12747( 5) - 30-Aug-2012 13:39:07 - [ 8] 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 | ------------------------------------------------------------------------------------------------------------------------------------ HOLMBERGIX-X1 1 WFC3/UVI ACCUM UVIS2-C1 F225W 1 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 1 WFC3/UVI ACCUM UVIS2-C1 F225W 2 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 1 WFC3/UVI ACCUM UVIS2-C1 F225W 3 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 2 WFC3/UVI ACCUM UVIS2-C1 F336W 1 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 2 WFC3/UVI ACCUM UVIS2-C1 F336W 2 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 2 WFC3/UVI ACCUM UVIS2-C1 F336W 3 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 3 WFC3/UVI ACCUM UVIS2-C1 F438W 1 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 3 WFC3/UVI ACCUM UVIS2-C1 F438W 2 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 3 WFC3/UVI ACCUM UVIS2-C1 F438W 3 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 4 WFC3/UVI ACCUM UVIS2-C1 F547M 1 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 4 WFC3/UVI ACCUM UVIS2-C1 F547M 2 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 4 WFC3/UVI ACCUM UVIS2-C1 F547M 3 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 5 WFC3/UVI ACCUM UVIS2-C1 F763M 1 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 5 WFC3/UVI ACCUM UVIS2-C1 F763M 2 none none none 1 N/A S K1C-SUB HOLMBERGIX-X1 5 WFC3/UVI ACCUM UVIS2-C1 F763M 3 none none none 2 N/A S K1C-SUB HOLMBERGIX-X1 6 WFC3/UVI ACCUM UVIS2-C1 F845M 1 none none none 2 N/A S K1C-SUB HOLMBERGIX-X1 6 WFC3/UVI ACCUM UVIS2-C1 F845M 2 none none none 2 N/A S K1C-SUB HOLMBERGIX-X1 6 WFC3/UVI ACCUM UVIS2-C1 F845M 3 none none none 2 N/A S K1C-SUB HOLMBERGIX-X1 7 WFC3/IR MULTIAC IRSUB512 F125W 1 none none none 2 N/A CUM HOLMBERGIX-X1 7 WFC3/IR MULTIAC IRSUB512 F125W 2 none none none 2 N/A CUM HOLMBERGIX-X1 7 WFC3/IR MULTIAC IRSUB512 F125W 3 none none none 2 N/A CUM HOLMBERGIX-X1 7 WFC3/IR MULTIAC IRSUB512 F125W 4 none none none 2 N/A CUM HOLMBERGIX-X1 8 WFC3/UVI ACCUM UVIS2-C1 F621M 1 none none none 2 N/A S K1C-SUB HOLMBERGIX-X1 8 WFC3/UVI ACCUM UVIS2-C1 F621M 2 none none none 2 N/A S K1C-SUB 12747( 5) - 30-Aug-2012 13:39:07 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HOLMBERGIX-X1 8 WFC3/UVI ACCUM UVIS2-C1 F621M 3 none none none 2 N/A S K1C-SUB HOLMBERGIX-X1 9 WFC3/UVI ACCUM UVIS2-C1 F689M 1 none none none 3 N/A S K1C-SUB HOLMBERGIX-X1 9 WFC3/UVI ACCUM UVIS2-C1 F689M 2 none none none 3 N/A S K1C-SUB HOLMBERGIX-X1 9 WFC3/UVI ACCUM UVIS2-C1 F689M 3 none none none 3 N/A S K1C-SUB HOLMBERGIX-X1 10 WFC3/IR MULTIAC IRSUB512 F098M 1 none none none 3 N/A CUM HOLMBERGIX-X1 10 WFC3/IR MULTIAC IRSUB512 F098M 2 none none none 3 N/A CUM HOLMBERGIX-X1 10 WFC3/IR MULTIAC IRSUB512 F098M 3 none none none 3 N/A CUM HOLMBERGIX-X1 10 WFC3/IR MULTIAC IRSUB512 F098M 4 none none none 3 N/A CUM HOLMBERGIX-X1 11 WFC3/IR MULTIAC IRSUB512 F160W 1 none none none 3 N/A CUM HOLMBERGIX-X1 11 WFC3/IR MULTIAC IRSUB512 F160W 2 none none none 3 N/A CUM HOLMBERGIX-X1 11 WFC3/IR MULTIAC IRSUB512 F160W 3 none none none 3 N/A CUM HOLMBERGIX-X1 11 WFC3/IR MULTIAC IRSUB512 F160W 4 none none none 3 N/A CUM 12747( 5) - 30-Aug-2012 13:39:07 - [ 10] Summary Form for Proposal 12747 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IRSUB512, UVIS2-C1K1C-SUB ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=10, FLASH=11, FLASH=11.0, FLASH=12, FLASH=8, FLASH=9, NSAMP=12, NSAMP=13, NSAMP=15, SAMP-SEQ=SPARS25, SAMP-SEQ=STEP25 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO BASE1B3, PATTERN 1 1, PATTERN 1 2, PATTERN 1 3, PATTERN 1 4, PATTERN 1 5, PATTERN 1 6, PATTERN 1 8, PATTERN 1 9, PATTERN 2 10, PATTERN 2 11, PATTERN 2 7, POS TARG +2, null ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F098M, F125W, F160W, F225W, F336W, F438W, F547M, F621M, F689M, F763M, F845M ------------------------------------------------------------------------------------------------------------------------------------ Target Names HOLMBERGIX-X1 ------------------------------------------------------------------------------------------------------------------------------------