10433( 8) - 03/23/06 14:28 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 10433 Version: 8 Check-in Time: 23-Mar-2006 19:27:30 Title The Cepheid PL-Z ------------------------------------------------------------------------------------ Type Cycle Parallel Pointing Tolerance GO 13 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Barry F. Madore Carnegie Institution of Washington CoI: Dr. Armando Gil de Paz Carnegie Institution of Washington N CoI: Ms. Olga Pevunova California Institute of Technology N ------------------------------------------------------------------------------------ Abstract We are proposing to empirically calibrate the metallicity sensitivity of the Cepheid Period-Luminosity relation at the highest metallicity range so far observed in nearby galaxies. To do this we will obtain the I-band Population II Tip of the Red Giant Branch (TRGB) distances to two galaxies, NGC 3627 and NGC 3368, both of which have comparable (Cepheid) distances of 11 Mpc and have almost identical (very high) metallicities of 12 + log[O/H] = +9.3. At present, observers have extremely divergent views on the magnitude of the metallicity effect on the Cepheid zero point, and theorists cannot even agee upon the sign of the effect. ------------------------------------------------------------------------------------ Observations Description ------------------------ V and I-band observations of the halo population of red giant stars surrounding M66 and M96 are to be obtained. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10433( 8) - 03/23/06 14:28 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC3627 GALAXY, SPIRAL RA=11H19M59.6000S +/- 1", J2000 V = 27.0+/-0.5 DEC=+12D59'28.00" +/- 1" Coordinate Source: IMAGE_TIED_TO_GSC_FRAME 2 NGC3368 GALAXY, SPIRAL RA=10H46M32.1000S +/- 1", J2000 V = 27.0+/-0.5 DEC=+11D48'23.00" +/- 1" Coordinate Source: IMAGE_TIED_TO_GSC_FRAME 10433( 8) - 03/23/06 14:28 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.146 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 47.17 Angle_Between_Sides Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ 10433( 8) - 03/23/06 14:28 - [ 4] Visit: 01 Visit Priority: Visit Requirements: PCS MODE FINE 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC3627 ACS/WFC ACCUM WFC F814W GAIN=2,CR-SPLIT=2 1 1082 S PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC3627 ACS/WFC ACCUM WFC F814W GAIN=2,CR-SPLIT=2 1 1122 S PATTERN 1 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC3627 ACS/WFC ACCUM WFC F814W GAIN=2,CR-SPLIT=2 1 1120 S PATTERN 1 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC3627 ACS/WFC ACCUM WFC F814W GAIN=2,CR-SPLIT=2 1 1112 S PATTERN 1 4 ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC3627 ACS/WFC ACCUM WFC F555W CR-SPLIT=2,GAIN=2 1 1112 S PATTERN 1 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC3627 1 ACS/WFC ACCUM WFC F814W 1 none none 1 1 N/A NGC3627 1 ACS/WFC ACCUM WFC F814W 1 none none 2 1 N/A NGC3627 1 ACS/WFC ACCUM WFC F814W 2 none none 1 1 N/A NGC3627 1 ACS/WFC ACCUM WFC F814W 2 none none 2 1 N/A NGC3627 2 ACS/WFC ACCUM WFC F814W 1 none none 1 2 N/A NGC3627 2 ACS/WFC ACCUM WFC F814W 1 none none 2 2 N/A NGC3627 2 ACS/WFC ACCUM WFC F814W 2 none none 1 2 N/A NGC3627 2 ACS/WFC ACCUM WFC F814W 2 none none 2 2 N/A NGC3627 3 ACS/WFC ACCUM WFC F814W 1 none none 1 3 N/A NGC3627 3 ACS/WFC ACCUM WFC F814W 1 none none 2 3 N/A NGC3627 3 ACS/WFC ACCUM WFC F814W 2 none none 1 3 N/A NGC3627 3 ACS/WFC ACCUM WFC F814W 2 none none 2 3 N/A NGC3627 4 ACS/WFC ACCUM WFC F814W 1 none none 1 4 N/A NGC3627 4 ACS/WFC ACCUM WFC F814W 1 none none 2 4 N/A NGC3627 4 ACS/WFC ACCUM WFC F814W 2 none none 1 4 N/A NGC3627 4 ACS/WFC ACCUM WFC F814W 2 none none 2 4 N/A NGC3627 5 ACS/WFC ACCUM WFC F555W 1 none none 1 5 N/A NGC3627 5 ACS/WFC ACCUM WFC F555W 1 none none 2 5 N/A NGC3627 5 ACS/WFC ACCUM WFC F555W 2 none none 1 5 N/A NGC3627 5 ACS/WFC ACCUM WFC F555W 2 none none 2 5 N/A 10433( 8) - 03/23/06 14:28 - [ 5] Visit: 02 Visit Priority: Visit Requirements: 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC3368 ACS/WFC ACCUM WFC F814W GAIN=2,CR-SPLIT=2 1 1118 S PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC3368 ACS/WFC ACCUM WFC F814W GAIN=2,CR-SPLIT=2 1 1150 S PATTERN 1 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC3368 ACS/WFC ACCUM WFC F814W GAIN=2,CR-SPLIT=2 1 1148 S PATTERN 1 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC3368 ACS/WFC ACCUM WFC F814W GAIN=2,CR-SPLIT=2 1 1140 S PATTERN 1 4 ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC3368 ACS/WFC ACCUM WFC F555W CR-SPLIT=2,GAIN=2 1 1140 S PATTERN 1 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC3368 1 ACS/WFC ACCUM WFC F814W 1 none none 1 1 N/A NGC3368 1 ACS/WFC ACCUM WFC F814W 1 none none 2 1 N/A NGC3368 1 ACS/WFC ACCUM WFC F814W 2 none none 1 1 N/A NGC3368 1 ACS/WFC ACCUM WFC F814W 2 none none 2 1 N/A NGC3368 2 ACS/WFC ACCUM WFC F814W 1 none none 1 2 N/A NGC3368 2 ACS/WFC ACCUM WFC F814W 1 none none 2 2 N/A NGC3368 2 ACS/WFC ACCUM WFC F814W 2 none none 1 2 N/A NGC3368 2 ACS/WFC ACCUM WFC F814W 2 none none 2 2 N/A NGC3368 3 ACS/WFC ACCUM WFC F814W 1 none none 1 3 N/A NGC3368 3 ACS/WFC ACCUM WFC F814W 1 none none 2 3 N/A NGC3368 3 ACS/WFC ACCUM WFC F814W 2 none none 1 3 N/A NGC3368 3 ACS/WFC ACCUM WFC F814W 2 none none 2 3 N/A NGC3368 4 ACS/WFC ACCUM WFC F814W 1 none none 1 4 N/A NGC3368 4 ACS/WFC ACCUM WFC F814W 1 none none 2 4 N/A NGC3368 4 ACS/WFC ACCUM WFC F814W 2 none none 1 4 N/A NGC3368 4 ACS/WFC ACCUM WFC F814W 2 none none 2 4 N/A NGC3368 5 ACS/WFC ACCUM WFC F555W 1 none none 1 5 N/A NGC3368 5 ACS/WFC ACCUM WFC F555W 1 none none 2 5 N/A NGC3368 5 ACS/WFC ACCUM WFC F555W 2 none none 1 5 N/A NGC3368 5 ACS/WFC ACCUM WFC F555W 2 none none 2 5 N/A 10433( 8) - 03/23/06 14:28 - [ 6] Summary Form for Proposal 10433 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters GAIN=2 CR-SPLIT=2 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PCS MODE FINE; PATTERN 1 1; PATTERN 1 2; PATTERN 1 3; PATTERN 1 4; PATTERN 1 5; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F814W F555W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC3627 NGC3368 ------------------------------------------------------------------------------------------------------------------------------------