9898( 9) - 07/21/03 09:22 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 9898 Version: 9 Check-in Date: 21-Jul-2003 09:20:06 1.Proposal Title: Calibration of the ACS Emission Line Filters ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 12 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Prof. C. Robert O'Dell Vanderbilt University ------------------------------------------------------------------------------------ 5. Abstract The emission line filter set for the ACS is seriously compromised because the Halpha and the primary [N II] lines are transmitted equally well by the F658N filter. This prevents an absolute calibration of these images with only a single filter, because one doesn't know the intrinsic ratio of these two lines. Absolute calibration is possible if one also makes observations in the [N II] dominated F660N filter and the calibration constants are known. This proposal describes a program that will allow determination of the calibration constants for the three emission line filters and how the observations can be corrected for continuum radiation passed through the same filters. The method was developed originally for WFPC2 and successfully applied there. The well calibrated Orion Nebula will be used as a reference source. Coordinate parallel observations of previously unobserved regions of the Orion Nebula and M 43 will be possible and these will be used to continue discovery of proplyds and other phenomena related to young stellar objects. ------------------------------------------------------------------------------------ 9898( 9) - 07/21/03 09:22 - [ 2] Observations Description ------------------------ ACS WFC and ACS HRC images will be made of the Orion Nebula for the purpose of calibrating the emission line filters, using two separate pointings and using two orbits for each pointing. Coordinated parallel WFPC2 observations will be made during all of these observations. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 9898( 9) - 07/21/03 09:22 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC1976-WFC CALIBRATION, NARROW RA=05H35M8.56S +/- 1.0", DEC=- J2000 V = 10.0 BAND FILTER CALIBRATION 05D23'27.0" +/- 1.0" Coordinate Source: Other_Source: Positions determined relative to Jones and Walker 337 and confirmed from PI's earlier WFPC2 images. 2 NGC1976-HRC CALIBRATION, NARROW RA=05H35M13.93S +/- 1.0", DEC=- J2000 V = 10.0 BAND FILTER CALIBRATION 05D23'27.0" +/- 1.0" Coordinate Source: Other_Source: Positions relative to Jones and Walker 337, checked against the PI's earlier WFPC2 images. 9898( 9) - 07/21/03 09:22 - [ 4] Visit: 01 Visit Priority: Visit Requirements: PCS MODE FINE ORIENT 2.0D TO 10.0 D On Hold Comments: Additional Comments: This is the visit for WFC observations and their parallel observations. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC1976-WFC ACS/WF ACCUM WFC1-FI F658N CR-SPLIT=2,GAIN=2 1 300 S PAR 2 WITH 1 C X ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY WFPC2 IMAGE WFALL F656N CR-SPLIT=0.5,ATD-GAIN=7 1 200 S ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC1976-WFC ACS/WF ACCUM WFC1-FI F660N CR-SPLIT=3,GAIN=2 1 1260 S PAR 4 WITH 3 C X ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY WFPC2 IMAGE WFALL F658N CR-SPLIT=0.5,ATD-GAIN=7 1 960 S ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC1976-WFC ACS/WF ACCUM WFC1-FI F550M CR-SPLIT=2,GAIN=2 1 800 S PAR 6 WITH 5 C X ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY WFPC2 IMAGE WFALL F547M CR-SPLIT=0.5,ATD-GAIN=7 1 300 S ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC1976-WFC ACS/WF ACCUM WFC1-FI F502N CR-SPLIT=2,GAIN=2 1 1098 S PAR 8 WITH 7 C X ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY WFPC2 IMAGE WFALL F502N CR-SPLIT=0.5,ATD-GAIN=7 1 450 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 none 1 tbd tbd 01 1 none none none 2 tbd tbd 01 2 none none none 1 tbd tbd 01 2 none none none 2 tbd tbd 01 3 none none none 1 tbd tbd 01 3 none none none 2 tbd tbd 01 3 none none none 3 tbd tbd 01 4 none none none 1 tbd tbd 01 4 none none none 2 tbd tbd 01 5 none none none 1 tbd tbd 01 5 none none none 2 tbd tbd 01 6 none none none 1 tbd tbd 01 6 none none none 2 tbd tbd 01 7 none none none 1 tbd tbd 01 7 none none none 2 tbd tbd 9898( 9) - 07/21/03 09:22 - [ 5] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 01 8 none none none 1 tbd tbd 01 8 none none none 2 tbd tbd 9898( 9) - 07/21/03 09:22 - [ 6] Visit: 02 Visit Priority: Visit Requirements: PCS MODE FINE ORIENT 2.0D TO 10.0 D On Hold Comments: Additional Comments: The is the visit for HRC observations and their parallel observations. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC1976-HRC ACS/HR ACCUM HRC-FIX F658N CR-SPLIT=3,GAIN=2 1 660 S PAR 2 WITH 1 C ------------------------------------------------------------------------------------------------------------------------------------ 2 ANY WFPC2 IMAGE WFALL F656N CR-SPLIT=0.5,ATD-GAIN=7 1 300 S ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC1976-HRC ACS/HR ACCUM HRC-FIX F660N CR-SPLIT=4 1 1684 S PAR 4 WITH 3 C ------------------------------------------------------------------------------------------------------------------------------------ 4 ANY WFPC2 IMAGE WFALL F658N CR-SPLIT=0.5,ATD-GAIN=7 1 1560 S ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC1976-HRC ACS/HR ACCUM HRC-FIX F550M CR-SPLIT=3 1 900 S PAR 6 WITH 5 C ------------------------------------------------------------------------------------------------------------------------------------ 6 ANY WFPC2 IMAGE WFALL F547M CR-SPLIT=0.5,ATD-GAIN=7 1 600 S ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC1976-HRC ACS/HR ACCUM HRC-FIX F502N CR-SPLIT=3 1 1560 S PAR 8 WITH 7 C ------------------------------------------------------------------------------------------------------------------------------------ 8 ANY WFPC2 IMAGE WFALL F502N CR-SPLIT=0.5,ATD-GAIN=7 1 1350 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 none 1 tbd tbd 02 1 none none none 2 tbd tbd 02 1 none none none 3 tbd tbd 02 2 none none none 1 tbd tbd 02 2 none none none 2 tbd tbd 02 3 none none none 1 tbd tbd 02 3 none none none 2 tbd tbd 02 3 none none none 3 tbd tbd 02 3 none none none 4 tbd tbd 02 4 none none none 1 tbd tbd 02 4 none none none 2 tbd tbd 02 5 none none none 1 tbd tbd 02 5 none none none 2 tbd tbd 02 5 none none none 3 tbd tbd 02 6 none none none 1 tbd tbd 9898( 9) - 07/21/03 09:22 - [ 7] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 02 6 none none none 2 tbd tbd 02 7 none none none 1 tbd tbd 02 7 none none none 2 tbd tbd 02 7 none none none 3 tbd tbd 02 8 none none none 1 tbd tbd 02 8 none none none 2 tbd tbd 9898( 9) - 07/21/03 09:22 - [ 8] Summary Form for Proposal 9898 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC1-FIX WFALL HRC-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC WFPC2 ACS/HRC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=2 GAIN=2 ATD-GAIN=7 CR-SPLIT=3 CR-SPLIT=0.5 CR-SPLIT=4 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PCS MODE FINE ORIENT 2.0D TO 10.0 D PAR 2 WITH 1 PAR 4 WITH 3 PAR 6 WITH 5 PAR 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F658N F656N F660N F550M F547M F502N ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC1976-WFC ANY NGC1976-HRC ------------------------------------------------------------------------------------------------------------------------------------