12309( 3) - 20-Dec-2010 20:38:16 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12309 Version: 3 Check-in Time: 20-Dec-2010 20:38:16 STScI Edit Number: 0 Title Calibration of the WFC3 Emission-Line Filters and Application of the Results to the Greatest Source of Uncertainties in Determining Abundances in Gaseous Nebulae ------------------------------------------------------------------------------------ Type Cycle GO 18 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. C. Robert O'Dell Vanderbilt University CoI: Dr. Gary J. Ferland University of Kentucky N CoI: Dr. William J. Henney Universidad Nacional Autonoma de Mexico N (UNAM) CoI: Dr. Manuel Peimbert Universidad Nacional Autonoma de Mexico N (UNAM) ------------------------------------------------------------------------------------ Abstract The WFC3 is arguably the most powerful camera that has been used on the HST. This capability arises in part from the uniquely complete set of narrow-band filters that were incorporated for making images of nebulae in emission-lines. Turning these oft-times beautiful images into scientifically useful information requires accurate flux calibration of the filters, which is the first subject of this proposal. The present plan is that WFC3 calibration will be done from pre-launch properties of the filters and observations of stars. The WFC3 filters transmission profiles were measured pre-launch in a different optical configuration and temperature than applies within the WFC3, thus rendering uncertain any flux calibrations tied to those pre-launch measurements. We propose to perform a ?ground-truth? calibration of the WFC3 narrow-band filters using NGC 6720 as a reference source, in much the same manner that the PI did when calibrating similar filters in the WFPC2 and the ACS. These new calibrations will then be used to address the t^2 problem in Gaseous Nebulae. This is the source of uncertainties in the relative abundances of factors 1.1 to 10 and undermines efforts to trace the abundance variations within our Galaxy and other galaxies. The t^2 problem remains unresolved after four decades and the NGC 6720 images used for the filter calibration may resolve the problem if they show that regions of small-scale temperature fluctuations arise from low-temperature shadow-zones behind knots that are known to exist within the nebula or from high-temperature shocks that have been posited. Unlike the case of the Orion Nebula, where we have addressed this problem with fewer diagnostic filters, the geometry of NGC 6720 is ideally favorable for seeing these temperature variations and identifying their cause. ------------------------------------------------------------------------------------ Observations Description ------------------------ WFC3/UVIS imaging will be made of NGC 6720, the Ring Nebula. A set of full field images will be made centered on the central star and a set of quadrant filter images will be made in a portion of the nebula centered west of the central star. Coordinated parallel images will be made with the ACS. Real Time Justification 12309( 3) - 20-Dec-2010 20:38:16 - [ 2] ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12309( 3) - 20-Dec-2010 20:38:16 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 M-57 ISM, EMISSION LINE RA=18H53M35.0790S +/- 0.1", J2000 V = 15.6 15.6 is for the central star, NEBULA, PLANETARY DEC=+33D01'45.03" +/- 0.1" which is not important for this NEBULA, RING NEBULA emission-line object. Reference Frame: Other: FK5 ------------------------------------------------------------------------------------------------------------------------------------ 2 M-57QUADS ISM, EMISSION LINE RA=18H53M32.9400S +/- 0.1", J2000 V = 15.6 +/- 0.1 15.6 is for the NEBULA, PLANETARY DEC=+33D01'48.90" +/- 0.1" central star, which is not important NEBULA, RING NEBULA for this emission-line object. Reference Frame: Other: FK5 ------------------------------------------------------------------------------------------------------------------------------------ 12309( 3) - 20-Dec-2010 20:38:16 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-MOSAIC-LINE Pattern_Purpose MOSAIC Number_Of_Points 2 Point_Spacing 3.264 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 63.697 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 12309( 3) - 20-Dec-2010 20:38:16 - [ 5] Visit: 01 Visit Requirements: ORIENT 20D TO 40 D; ORIENT 290D TO 310 D; ORIENT 200D TO 220 D; ORIENT 110D TO 130 D On Hold Comments: Additional Comments: First Visit Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 M-57 WFC3/UVI ACCUM UVIS-CENT F656N 1 560 S PATTERN 1 1 S ER ------------------------------------------------------------------------------------------------------------------------------------ 2 M-57 WFC3/UVI ACCUM UVIS-CENT F658N 1 700 S PATTERN 1 2-3; PAR 3 S ER WITH 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 M-57 ACS/WFC ACCUM WFC-FIX F502N 1 500 S ------------------------------------------------------------------------------------------------------------------------------------ 4 M-57 WFC3/UVI ACCUM UVIS-CENT F502N 1 615 S PATTERN 1 4 S ER ------------------------------------------------------------------------------------------------------------------------------------ 5 M-57 WFC3/UVI ACCUM UVIS-CENT F487N 1 700 S PATTERN 1 5-6; PAR 6 S ER WITH 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 M-57 ACS/WFC ACCUM WFC-FIX F550M 1 500 S ------------------------------------------------------------------------------------------------------------------------------------ 7 M-57 WFC3/UVI ACCUM UVIS-CENT F673N 1 615 S PATTERN 1 7 S ER ------------------------------------------------------------------------------------------------------------------------------------ 8 M-57 WFC3/UVI ACCUM UVIS-CENT F953N 1 700 S PATTERN 1 8-9; PAR 9 S ER WITH 8 ------------------------------------------------------------------------------------------------------------------------------------ 9 M-57 ACS/WFC ACCUM WFC-FIX F658N 1 500 S ------------------------------------------------------------------------------------------------------------------------------------ 10 M-57 WFC3/UVI ACCUM UVIS-CENT F547M 1 615 S PATTERN 1 10 S ER ------------------------------------------------------------------------------------------------------------------------------------ 11 M-57 WFC3/UVI ACCUM UVIS-CENT F469N 1 700 S PATTERN 1 11-12; PAR 12 S ER WITH 11 ------------------------------------------------------------------------------------------------------------------------------------ 12 M-57 ACS/WFC ACCUM WFC-FIX F660N 1 500 S ------------------------------------------------------------------------------------------------------------------------------------ 13 M-57 WFC3/UVI ACCUM UVIS-CENT F645N 1 615 S PATTERN 1 13 S ER ------------------------------------------------------------------------------------------------------------------------------------ 14 M-57QUADS WFC3/UVI ACCUM UVIS-QUAD FQ750N CR-SPLIT=2 1 1400 S S ------------------------------------------------------------------------------------------------------------------------------------ 12309( 3) - 20-Dec-2010 20:38:16 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ M-57 1 WFC3/UVI ACCUM UVIS-CEN F656N 1 none none none 1 N/A S TER M-57 1 WFC3/UVI ACCUM UVIS-CEN F656N 2 none none none 1 N/A S TER M-57 2 WFC3/UVI ACCUM UVIS-CEN F658N 1 none none none 1 N/A S TER M-57 2 WFC3/UVI ACCUM UVIS-CEN F658N 2 none none none 1 N/A S TER M-57 3 ACS/WFC ACCUM WFC-FIX F502N 1 none none none 1 N/A M-57 3 ACS/WFC ACCUM WFC-FIX F502N 2 none none none 1 N/A M-57 4 WFC3/UVI ACCUM UVIS-CEN F502N 1 none none none 2 N/A S TER M-57 4 WFC3/UVI ACCUM UVIS-CEN F502N 2 none none none 2 N/A S TER M-57 5 WFC3/UVI ACCUM UVIS-CEN F487N 1 none none none 2 N/A S TER M-57 5 WFC3/UVI ACCUM UVIS-CEN F487N 2 none none none 2 N/A S TER M-57 6 ACS/WFC ACCUM WFC-FIX F550M 1 none none none 2 N/A M-57 6 ACS/WFC ACCUM WFC-FIX F550M 2 none none none 2 N/A M-57 7 WFC3/UVI ACCUM UVIS-CEN F673N 1 none none none 3 N/A S TER M-57 7 WFC3/UVI ACCUM UVIS-CEN F673N 2 none none none 3 N/A S TER M-57 8 WFC3/UVI ACCUM UVIS-CEN F953N 1 none none none 3 N/A S TER M-57 8 WFC3/UVI ACCUM UVIS-CEN F953N 2 none none none 3 N/A S TER M-57 9 ACS/WFC ACCUM WFC-FIX F658N 1 none none none 3 N/A M-57 9 ACS/WFC ACCUM WFC-FIX F658N 2 none none none 3 N/A M-57 10 WFC3/UVI ACCUM UVIS-CEN F547M 1 none none none 4 N/A S TER M-57 10 WFC3/UVI ACCUM UVIS-CEN F547M 2 none none none 4 N/A S TER M-57 11 WFC3/UVI ACCUM UVIS-CEN F469N 1 none none none 4 N/A S TER M-57 11 WFC3/UVI ACCUM UVIS-CEN F469N 2 none none none 4 N/A S TER M-57 12 ACS/WFC ACCUM WFC-FIX F660N 1 none none none 4 N/A M-57 12 ACS/WFC ACCUM WFC-FIX F660N 2 none none none 4 N/A M-57 13 WFC3/UVI ACCUM UVIS-CEN F645N 1 none none none 5 N/A S TER 12309( 3) - 20-Dec-2010 20:38:16 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ M-57 13 WFC3/UVI ACCUM UVIS-CEN F645N 2 none none none 5 N/A S TER M-57QUADS 14 WFC3/UVI ACCUM UVIS-QUA FQ750N none none none 1 5 N/A S D M-57QUADS 14 WFC3/UVI ACCUM UVIS-QUA FQ750N none none none 2 5 N/A S D 12309( 3) - 20-Dec-2010 20:38:16 - [ 8] Visit: 02 Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: Second Visit Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 M-57QUADS WFC3/UVI ACCUM UVIS-QUAD FQ672N CR-SPLIT=2 1 1270 S S ------------------------------------------------------------------------------------------------------------------------------------ 2 M-57QUADS WFC3/UVI ACCUM UVIS-QUAD FQ674N CR-SPLIT=2 1 1270 S PAR 3 WITH 2 S ------------------------------------------------------------------------------------------------------------------------------------ 3 M-57QUADS ACS/WFC ACCUM WFC F550M CR-SPLIT=2 1 1000 S ------------------------------------------------------------------------------------------------------------------------------------ 4 M-57QUADS WFC3/UVI ACCUM UVIS-QUAD FQ436N CR-SPLIT=4 1 2600 S PAR 5 WITH 4 S ------------------------------------------------------------------------------------------------------------------------------------ 5 M-57QUADS ACS/WFC ACCUM WFC F502N CR-SPLIT=2 1 2600 S ------------------------------------------------------------------------------------------------------------------------------------ 6 M-57QUADS WFC3/UVI ACCUM UVIS-QUAD FQ437N CR-SPLIT=3 1 2640 S PAR 7 WITH 6 S ------------------------------------------------------------------------------------------------------------------------------------ 7 M-57QUADS ACS/WFC ACCUM WFC F658N CR-SPLIT=2 1 2550 S ------------------------------------------------------------------------------------------------------------------------------------ 8 M-57QUADS WFC3/UVI ACCUM UVIS-QUAD FQ575N CR-SPLIT=4 1 2640 S PAR 9 WITH 8 S ------------------------------------------------------------------------------------------------------------------------------------ 9 M-57QUADS ACS/WFC ACCUM WFC F660N CR-SPLIT=2 1 2600 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 | ------------------------------------------------------------------------------------------------------------------------------------ M-57QUADS 1 WFC3/UVI ACCUM UVIS-QUA FQ672N none none none 1 1 N/A S D M-57QUADS 1 WFC3/UVI ACCUM UVIS-QUA FQ672N none none none 2 1 N/A S D M-57QUADS 2 WFC3/UVI ACCUM UVIS-QUA FQ674N none none none 1 1 N/A S D M-57QUADS 2 WFC3/UVI ACCUM UVIS-QUA FQ674N none none none 2 1 N/A S D M-57QUADS 3 ACS/WFC ACCUM WFC F550M none none none 1 1 N/A M-57QUADS 3 ACS/WFC ACCUM WFC F550M none none none 2 1 N/A M-57QUADS 4 WFC3/UVI ACCUM UVIS-QUA FQ436N none none none 1 2 N/A S D 12309( 3) - 20-Dec-2010 20:38:16 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ M-57QUADS 4 WFC3/UVI ACCUM UVIS-QUA FQ436N none none none 2 2 N/A S D M-57QUADS 4 WFC3/UVI ACCUM UVIS-QUA FQ436N none none none 3 2 N/A S D M-57QUADS 4 WFC3/UVI ACCUM UVIS-QUA FQ436N none none none 4 2 N/A S D M-57QUADS 5 ACS/WFC ACCUM WFC F502N none none none 1 2 N/A M-57QUADS 5 ACS/WFC ACCUM WFC F502N none none none 2 2 N/A M-57QUADS 6 WFC3/UVI ACCUM UVIS-QUA FQ437N none none none 1 3 N/A S D M-57QUADS 6 WFC3/UVI ACCUM UVIS-QUA FQ437N none none none 2 3 N/A S D M-57QUADS 6 WFC3/UVI ACCUM UVIS-QUA FQ437N none none none 3 3 N/A S D M-57QUADS 7 ACS/WFC ACCUM WFC F658N none none none 1 3 N/A M-57QUADS 7 ACS/WFC ACCUM WFC F658N none none none 2 3 N/A M-57QUADS 8 WFC3/UVI ACCUM UVIS-QUA FQ575N none none none 1 4 N/A S D M-57QUADS 8 WFC3/UVI ACCUM UVIS-QUA FQ575N none none none 2 4 N/A S D M-57QUADS 8 WFC3/UVI ACCUM UVIS-QUA FQ575N none none none 3 4 N/A S D M-57QUADS 8 WFC3/UVI ACCUM UVIS-QUA FQ575N none none none 4 4 N/A S D M-57QUADS 9 ACS/WFC ACCUM WFC F660N none none none 1 4 N/A M-57QUADS 9 ACS/WFC ACCUM WFC F660N none none none 2 4 N/A 12309( 3) - 20-Dec-2010 20:38:16 - [ 10] Summary Form for Proposal 12309 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-CENTER, UVIS-QUAD, WFC, WFC-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=2, CR-SPLIT=3, CR-SPLIT=4 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 110D TO 130 D, ORIENT 200D TO 220 D, ORIENT 20D TO 40 D, ORIENT 290D TO 310 D, PAR 12 WITH 11, PAR 3 WITH 2, PAR 5 WITH 4, PAR 6 WITH 5, PAR 7 WITH 6, PAR 9 WITH 8, PATTERN 1 1, PATTERN 1 10, PATTERN 1 11-12, PATTERN 1 13, PATTERN 1 2-3, PATTERN 1 4, PATTERN 1 5-6, PATTERN 1 7, PATTERN 1 8-9, SAME ORIENT AS 01 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F469N, F487N, F502N, F547M, F550M, F645N, F656N, F658N, F660N, F673N, F953N, FQ436N, FQ437N, FQ575N, FQ672N, FQ674N, FQ750N ------------------------------------------------------------------------------------------------------------------------------------ Target Names M-57, M-57QUADS ------------------------------------------------------------------------------------------------------------------------------------