15823( 7) - 11-Feb-2021 16:25:32 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15823 Version: 7 Check-in Time: 11-Feb-2021 16:25:32 STScI Edit Number: 3 Title Proper Motions and UV Spectroscopy of the MgII nebula around Eta Carinae ------------------------------------------------------------------------------------ Type Cycle GO 27 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Nathan Smith University of Arizona Y CoI: Dr. Jon A. Morse BoldlyGo Institute N ------------------------------------------------------------------------------------ Abstract In Cycle 25, a UV image of Mg II 2800 emission in the nebula around the massive star Eta Carinae was obtained using the F280N filter with WFC3. This was the first WFC3 imaging of Eta Car, the first image of Mg II around a massive star, and the first deep UV image of its nebulosity. That image revealed strong Mg II emission, but with unexpected morphology. Mg II is anticorrelated with any other line emission features seen previously in typical tracers like Halpha, [N II], or [Fe II] emission. Mg II emission provides an entirely new view of Eta Car, revealing a significant reservoir of additional ejecta mass and kinetic energy outside the main bipolar nebula, which has been invisible in all other imaging filters used so far. The MgII emission is probably resonance scattering of near-UV starlight, tracing dense warm neutral gas that is unshocked. Since it is outside the main bipolar nebula, it may hold critical clues about the acceleration of the ejcta and the mass loss and instability of the star in the decades leading up to the eruption that cannot be ascertained any other way. We therefore propose to obtain a second epoch of imaging for proper motions, and deep STIS spectroscopy of the extended MgII emission in order to measure its expansion speed and its 3D structure. The measured ratio of the MgII doublet will trace the optical depth of the line and test our hypothesus that it is resonance scattering, allowing a rough mass estimate of this material. Combined with velocities from proper motions and spectra, these observations will therefore constrain the kinetic energy that this material adds to the total energy budget of Eta Carinae's eruption. ------------------------------------------------------------------------------------ Observations Description ------------------------ This program has two observational goals. One is to obtain a second epoch of imaging in the WFC3/UVIS F280N, F336W, and F658N filters in order to measure proper motions of Mg II 2800 AA emission, near-UV continuum, and [N II] emission as compared to previous epochs. Toward this goal, we duplicate as closely as possible our previous observation. The second observational goal is to obtain long-slit STIS spectra of Mg II 2800 AA line from ejecta immediately outside the bipolar Homunculus nebula in order to measure radial velocities along the slit, and hence, 3D kinematics in conbination with proper motions. The WFC3 imaging uses two CVZ orbits (one for a deep F280N image, and one for both F336W and F658N). The STIS spectra use 4 CVZ orbits, with two different slit positions (2 orits each). ------------------------------------------------------------------------------------ 15823( 7) - 11-Feb-2021 16:25:32 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 ETA-CAR STAR, CIRCUMSTELLAR RA=10H45M3.5460S, J2000 V = 6.21 MATTER, ETA CARINAE DEC=-59D41'3.95" STAR Reference Frame: ICRS Extended: YES Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 15823( 7) - 11-Feb-2021 16:25:32 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.145 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 4 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.173 Line_Spacing 0.112 Coordinate_Frame POS-TARG Pattern_Orient 23.884 Angle_Between_Sides 81.785 Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ 15823( 7) - 11-Feb-2021 16:25:32 - [ 4] Visit: 02 (STIS polar axis) Visit Requirements: CVZ; ORIENT 350D TO 360 D; ORIENT 170D TO 180 D On Hold Comments: Additional Comments: STIS spectrum with slit oriented roughly along polar axis 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 ETA-CAR STIS/CCD ACQ F25ND3 MIRROR 1 0.2 S (0.2 GS ACQ SCENARIO BASE1BE S) ------------------------------------------------------------------------------------------------------------------------------------ 2 ETA-CAR STIS/CCD ACQ/PEA 52X0.2F1- G230MB 2794 1 0.5 S (0.5 K R S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ETA-CAR STIS/CCD ACCUM 52X0.5 G230MB 2794 CR-SPLIT=4, WAVECAL=NO 1 9400 S POS TARG -1.5, 0.0 (9400 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/CCD ACCUM 52X0.05 G230MB 2794 1 DEF (0 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 | ------------------------------------------------------------------------------------------------------------------------------------ ETA-CAR 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A ETA-CAR 2 STIS/CCD ACQ/PEA 52X0.2F1 G230MB 2794 none none none none 1 N/A K -R ETA-CAR 3 STIS/CCD ACCUM 52X0.5 G230MB 2794 none none none 1 1 N/A ETA-CAR 3 STIS/CCD ACCUM 52X0.5 G230MB 2794 none none none 2 1 N/A ETA-CAR 3 STIS/CCD ACCUM 52X0.5 G230MB 2794 none none none 3 2 N/A ETA-CAR 3 STIS/CCD ACCUM 52X0.5 G230MB 2794 none none none 4 2 N/A WAVE 4 STIS/CCD ACCUM 52X0.05 G230MB 2794 none none none none 2 N/A 15823( 7) - 11-Feb-2021 16:25:32 - [ 5] Visit: 03 (STIS minor axis) Visit Requirements: CVZ; ORIENT 255D TO 275 D; ORIENT 75D TO 95 D On Hold Comments: Additional Comments: STIS spectrum with slit oriented roughly perpendicular to the polar axis 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 ETA-CAR STIS/CCD ACQ F25ND3 MIRROR 1 0.2 S (0.2 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 ETA-CAR STIS/CCD ACQ/PEA 52X0.2F1- G230MB 2794 1 0.5 S (0.5 K R S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ETA-CAR STIS/CCD ACCUM 52X0.2 G230MB 2794 CR-SPLIT=4 1 9400 S POS TARG 1.5, null (9400 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 | ------------------------------------------------------------------------------------------------------------------------------------ ETA-CAR 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A ETA-CAR 2 STIS/CCD ACQ/PEA 52X0.2F1 G230MB 2794 none none none none 1 N/A K -R ETA-CAR 3 STIS/CCD ACCUM 52X0.2 G230MB 2794 none none none 1 1 N/A ETA-CAR 3 STIS/CCD ACCUM 52X0.2 G230MB 2794 none none none 2 1 N/A ETA-CAR 3 STIS/CCD ACCUM 52X0.2 G230MB 2794 none none none 3 2 N/A ETA-CAR 3 STIS/CCD ACCUM 52X0.2 G230MB 2794 none none none 4 2 N/A 15823( 7) - 11-Feb-2021 16:25:32 - [ 6] Visit: 04 (WFC3 UVIS) Visit Requirements: CVZ; ORIENT 345D TO 355 D On Hold Comments: Additional Comments: Any ORIENT could suffice for these observations, however duplicating the orientation of program 15289 UVIS F280N observations would be helpful for data analysis and directs the diffraction spikes and CCD saturation bleeding away from important outer emission. The image header states that PA_V3 = 169.08 degrees for the March 2018 F280N images. Please duplicate this orientation (or use 349.08 degrees) if possible. 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 ETA-CAR WFC3/UVI ACCUM UVIS-CENT F280N CR-SPLIT=2, FLASH=2.0 1 1120 S GS ACQ SCENARIO BASE1B3; S ER (4480 S) PATTERN 4 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 ETA-CAR WFC3/UVI ACCUM UVIS2-C1K F280N FLASH=2.0 1 1.8 S (3.6 PATTERN 2 2-10 S 1C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ETA-CAR WFC3/UVI ACCUM UVIS2-C1K F280N FLASH=2.0 1 20 S (40 S 1C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 4 ETA-CAR WFC3/UVI ACCUM UVIS2-C1K F280N FLASH=2.0 1 400 S (800 S 1C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 5 ETA-CAR WFC3/UVI ACCUM UVIS2-C1K F336W FLASH=2.0 1 0.5 S (1 S 1C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 6 ETA-CAR WFC3/UVI ACCUM UVIS2-C1K F336W FLASH=2.0 1 8 S (16 S) S 1C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 7 ETA-CAR WFC3/UVI ACCUM UVIS2-C1K F336W FLASH=2.0 1 36 S (72 S 1C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 8 ETA-CAR WFC3/UVI ACCUM UVIS2-C1K F658N FLASH=2.0 1 0.5 S (1 S 1C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 9 ETA-CAR WFC3/UVI ACCUM UVIS2-C1K F658N FLASH=2.0 1 8 S (16 S) S 1C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 10 ETA-CAR WFC3/UVI ACCUM UVIS2-C1K F658N FLASH=2.0 1 36 S (72 S 1C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 11 ETA-CAR WFC3/UVI ACCUM UVIS-CENT F336W FLASH=2.0 1 400 S (800 PATTERN 2 11-12 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 12 ETA-CAR WFC3/UVI ACCUM UVIS-CENT F658N FLASH=2.0 1 360 S (720 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 15823( 7) - 11-Feb-2021 16:25:32 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ ETA-CAR 1 WFC3/UVI ACCUM UVIS-CEN F280N 1 none none 1 1 N/A S TER ETA-CAR 1 WFC3/UVI ACCUM UVIS-CEN F280N 1 none none 2 1 N/A S TER ETA-CAR 1 WFC3/UVI ACCUM UVIS-CEN F280N 2 none none 1 1 N/A S TER ETA-CAR 1 WFC3/UVI ACCUM UVIS-CEN F280N 2 none none 2 1 N/A S TER ETA-CAR 1 WFC3/UVI ACCUM UVIS-CEN F280N 3 none none 1 1 N/A S TER ETA-CAR 1 WFC3/UVI ACCUM UVIS-CEN F280N 3 none none 2 1 N/A S TER ETA-CAR 1 WFC3/UVI ACCUM UVIS-CEN F280N 4 none none 1 1 N/A S TER ETA-CAR 1 WFC3/UVI ACCUM UVIS-CEN F280N 4 none none 2 1 N/A S TER ETA-CAR 2 WFC3/UVI ACCUM UVIS2-C1 F280N 1 none none none 2 N/A S K1C-SUB ETA-CAR 2 WFC3/UVI ACCUM UVIS2-C1 F280N 2 none none none 2 N/A S K1C-SUB ETA-CAR 3 WFC3/UVI ACCUM UVIS2-C1 F280N 1 none none none 2 N/A S K1C-SUB ETA-CAR 3 WFC3/UVI ACCUM UVIS2-C1 F280N 2 none none none 2 N/A S K1C-SUB ETA-CAR 4 WFC3/UVI ACCUM UVIS2-C1 F280N 1 none none none 2 N/A S K1C-SUB ETA-CAR 4 WFC3/UVI ACCUM UVIS2-C1 F280N 2 none none none 2 N/A S K1C-SUB ETA-CAR 5 WFC3/UVI ACCUM UVIS2-C1 F336W 1 none none none 2 N/A S K1C-SUB ETA-CAR 5 WFC3/UVI ACCUM UVIS2-C1 F336W 2 none none none 2 N/A S K1C-SUB ETA-CAR 6 WFC3/UVI ACCUM UVIS2-C1 F336W 1 none none none 2 N/A S K1C-SUB ETA-CAR 6 WFC3/UVI ACCUM UVIS2-C1 F336W 2 none none none 2 N/A S K1C-SUB ETA-CAR 7 WFC3/UVI ACCUM UVIS2-C1 F336W 1 none none none 2 N/A S K1C-SUB ETA-CAR 7 WFC3/UVI ACCUM UVIS2-C1 F336W 2 none none none 2 N/A S K1C-SUB ETA-CAR 8 WFC3/UVI ACCUM UVIS2-C1 F658N 1 none none none 2 N/A S K1C-SUB 15823( 7) - 11-Feb-2021 16:25:32 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ ETA-CAR 8 WFC3/UVI ACCUM UVIS2-C1 F658N 2 none none none 2 N/A S K1C-SUB ETA-CAR 9 WFC3/UVI ACCUM UVIS2-C1 F658N 1 none none none 2 N/A S K1C-SUB ETA-CAR 9 WFC3/UVI ACCUM UVIS2-C1 F658N 2 none none none 2 N/A S K1C-SUB ETA-CAR 10 WFC3/UVI ACCUM UVIS2-C1 F658N 1 none none none 2 N/A S K1C-SUB ETA-CAR 10 WFC3/UVI ACCUM UVIS2-C1 F658N 2 none none none 2 N/A S K1C-SUB ETA-CAR 11 WFC3/UVI ACCUM UVIS-CEN F336W 1 none none none 2 N/A S TER ETA-CAR 11 WFC3/UVI ACCUM UVIS-CEN F336W 2 none none none 2 N/A S TER ETA-CAR 12 WFC3/UVI ACCUM UVIS-CEN F658N 1 none none none 2 N/A S TER ETA-CAR 12 WFC3/UVI ACCUM UVIS-CEN F658N 2 none none none 2 N/A S TER 15823( 7) - 11-Feb-2021 16:25:32 - [ 9] Summary Form for Proposal 15823 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X0.05, 52X0.2, 52X0.2F1-R, 52X0.5, F25ND3, UVIS-CENTER, UVIS2-C1K1C-SUB ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, ACQ/PEAK ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=2, CR-SPLIT=4, FLASH=2.0, WAVECAL=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CVZ, GS ACQ SCENARIO BASE1B3, GS ACQ SCENARIO BASE1BE, ORIENT 170D TO 180 D, ORIENT 255D TO 275 D, ORIENT 345D TO 355 D, ORIENT 350D TO 360 D, ORIENT 75D TO 95 D, PATTERN 2 11-12, PATTERN 2 2-10, PATTERN 4 1, POS TARG -1.5, 0.0, POS TARG 1.5, null ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F280N, F336W, F658N, G230MB, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names ETA-CAR, WAVE ------------------------------------------------------------------------------------------------------------------------------------