6664( 8) - 03/04/97 09:46 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6664 Version: 8 Check-in Date: 04-Mar-1997 09:24:24 1.Proposal Title: Stellar Ages in M 32: Exposing the Conspiracy ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle STELLAR POPULATIONS GO 6 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: GUY WORTHEY UNIVERISITY OF MICHIGAN CoI: Mario Mateo University of Michigan N ------------------------------------------------------------------------------------ 6. Abstract Shallow two-filter and deep single-filter stellar photometry will be obtained with WFPC2 in M 32 and M 31 in order to isolate the fraction of the stellar populations in M 32 with ages less than about 4 Gyr. The M 32 field is 4 arcmin to the SE of galaxy center. An M 31 control field 10 arcmin to the NE will also be observed in an identical fashion. M 31 and M 32 RR Lyrae variables will be detected, measuring the fraction of the metal-poor population which is older than 10 Gyr. Accurate periods and luminosities will be obtained for less than 5% of the variables detected. ------------------------------------------------------------------------------------ Observations Description ------------------------ 6 orbits will be spent on a field 4 arcmin SE of M32 and 6 orbits in a field 10 arcmin NE of this spot. Each orbit will be split into 2 exposures, most of them with the f606w filter, 4 of them (per visit) with f814w. To maximize reliable time baseline for the RR Lyraes, the first and last orbits will be devoted solely to f606w. Frames from different orbits will be spatially dithered to increase resolution, but telescope pointing will not be changed within an orbit. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 6664( 8) - 03/04/97 09:46 - [ 2] Data Distribution Media: 8MM Blocking Factor: 10 Ship To: 834 Dennison Bldg, Dept. of Astronomy, Univ. of Michigan, Ann Arbor, MI 48109- 1090 Ship Via: Email: worthey@astro.lsa.umich.edu ------------------------------------------------------------------------------------ 6664( 8) - 03/04/97 09:46 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC221-POS3 GALAXY, ELLIPTICAL RA=0H 43M 1.30S,DEC=40D 50' J2000 V=-200 SURF(V) = 23.5 21.09",REGION,R=30" SURF-BKG(V) = 23.5 B-V = 0.7 Comments: N221 + N224 surface brightnesses blend near this point (3.6arcmin SE of N221 nuc). No bright stars in PC field. A few in WF. 2 NGC221-POS3- GALAXY, ELLIPTICAL RA=0H 43M 27.75S,DEC=41D 3' J2000 V=-200 SURF(V) = 23.5 OFF 49.01",REGION,R=30" B-V = 0.7 Comments: A control field dominated by N224 light. No bright stars in PC field. A few in WF. 6664( 8) - 03/04/97 09:46 - [ 4] Visit: 01 Visit Requirements: ORIENT 120D TO 130D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC221-POS3 WFPC2 IMAGE PC1-FIX F606W 5935 CR-SPLIT=NO 1 1100 S LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC221-POS3 WFPC2 IMAGE PC1-FIX F606W 5935 CR-SPLIT=NO 1 1100 S LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC221-POS3 WFPC2 IMAGE PC1-FIX F814W 7921 CR-SPLIT=NO 1 1100 S POS TARG 0.500,0.250 LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC221-POS3 WFPC2 IMAGE PC1-FIX F606W 5935 CR-SPLIT=NO 1 1100 S SAME POS AS 3 LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC221-POS3 WFPC2 IMAGE PC1-FIX F606W 5935 CR-SPLIT=NO 1 1100 S SAME POS AS 3 LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC221-POS3 WFPC2 IMAGE PC1-FIX F814W 7921 CR-SPLIT=NO 1 1100 S SAME POS AS 3 LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC221-POS3 WFPC2 IMAGE PC1-FIX F814W 7921 CR-SPLIT=NO 1 1100 S POS TARG 0.750,0.750 LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC221-POS3 WFPC2 IMAGE PC1-FIX F606W 5935 CR-SPLIT=NO 1 1100 S SAME POS AS 7 LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC221-POS3 WFPC2 IMAGE PC1-FIX F814W 7921 CR-SPLIT=NO 1 1100 S SAME POS AS 7 LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC221-POS3 WFPC2 IMAGE PC1-FIX F606W 5935 CR-SPLIT=NO 1 1100 S SAME POS AS 7 LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC221-POS3 WFPC2 IMAGE PC1-FIX F606W 5935 CR-SPLIT=NO 1 1100 S POS TARG 0.250,0.500 LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 12 NGC221-POS3 WFPC2 IMAGE PC1-FIX F606W 5935 CR-SPLIT=NO 1 1100 S SAME POS AS 11 LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 6664( 8) - 03/04/97 09:46 - [ 5] Visit: 02 Visit Requirements: ORIENT 120D TO 130D On Hold Comments: Additional Comments: ORIENT -10D TO 10D FROM 1 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC221-POS3 WFPC2 IMAGE PC1-FIX F606W 5935 CR-SPLIT=NO 1 1100 S LOW-SKY -OFF ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC221-POS3 WFPC2 IMAGE PC1-FIX F606W 5935 CR-SPLIT=NO 1 1100 S LOW-SKY -OFF ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC221-POS3 WFPC2 IMAGE PC1-FIX F814W 7921 CR-SPLIT=NO 1 1100 S POS TARG 0.500,0.250 -OFF LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC221-POS3 WFPC2 IMAGE PC1-FIX F606W 5935 CR-SPLIT=NO 1 1100 S SAME POS AS 3 LOW-SKY -OFF ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC221-POS3 WFPC2 IMAGE PC1-FIX F606W 5935 CR-SPLIT=NO 1 1100 S SAME POS AS 3 LOW-SKY -OFF ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC221-POS3 WFPC2 IMAGE PC1-FIX F814W 7921 CR-SPLIT=NO 1 1100 S SAME POS AS 3 LOW-SKY -OFF ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC221-POS3 WFPC2 IMAGE PC1-FIX F814W 7921 CR-SPLIT=NO 1 1100 S POS TARG 0.750,0.750 -OFF LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC221-POS3 WFPC2 IMAGE PC1-FIX F606W 5935 CR-SPLIT=NO 1 1100 S SAME POS AS 7 LOW-SKY -OFF ------------------------------------------------------------------------------------------------------------------------------------ 9 NGC221-POS3 WFPC2 IMAGE PC1-FIX F814W 7921 CR-SPLIT=NO 1 1100 S SAME POS AS 7 LOW-SKY -OFF ------------------------------------------------------------------------------------------------------------------------------------ 10 NGC221-POS3 WFPC2 IMAGE PC1-FIX F606W 5935 CR-SPLIT=NO 1 1100 S SAME POS AS 7 LOW-SKY -OFF ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC221-POS3 WFPC2 IMAGE PC1-FIX F606W 5935 CR-SPLIT=NO 1 1100 S POS TARG 0.250,0.500 -OFF LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ 12 NGC221-POS3 WFPC2 IMAGE PC1-FIX F606W 5935 CR-SPLIT=NO 1 1100 S SAME POS AS 11 LOW-SKY -OFF ------------------------------------------------------------------------------------------------------------------------------------ 6664( 8) - 03/04/97 09:46 - [ 6] Summary Form for Proposal 6664 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR POPULATIONS ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 120D TO 130D LOW-SKY POS TARG 0.500,0.250 LOW-SKY SAME POS AS 3 LOW-SKY POS TARG 0.750,0.750 LOW-SKY SAME POS AS 7 LOW-SKY POS TARG 0.250,0.500 LOW-SKY SAME POS AS 11 LOW-SKY ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC221-POS3 NGC221-POS3-OFF ------------------------------------------------------------------------------------------------------------------------------------