6640( 8) - 09/05/97 10:30 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6640 Version: 8 Check-in Date: 05-Sep-1997 10:28:04 1.Proposal Title: A Stellar Population Survey of the Nuclear Region of M33 ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle STELLAR POPULATIONS GO 6 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: KENNETH JOHN MIGHELL NOAO CoI: R. Michael Rich Columbia University N ------------------------------------------------------------------------------------ 6. Abstract Our analysis of archival HST images of the nuclear region of M33 reveal that the old, red stars are more centrally concentrated to the nucleus than the young star forming disk. We will extend our investigation of the stellar populations near the nucleus of M33 out to a radial distance of 10 arcmin by doing a WFPC2 strip survey of all M33 stars brighter than I~23.0 mag from the nucleus to the nearby globular cluster H38. The detection limit of the survey is about 2.3 mag below the tip of the red giant branch of the Population II stars in M33. This survey will allow us to separate the bulge population from the disk on the basis of their spatial distributions and we will also cover a large enough radial distance from the nucleus to measure directly the effective radius of the spheroid population. Our discovery of a large abundance spread of at least 1.5 dex found in the population II red giants near the nucleus of M33 suggests that the the chemical evolution of the nuclear region was considerably different than that of the M33 halo. This survey should provide valuable information about the formation and chemical evolution of the nuclear region of M33. These images will show whether M33 has a bulge that is much younger than its halo, how its oldest populations are related to the disk, and how the spheroid is related to the nucleus. This kind of detailed study is possible only in M33 because of its proximity, face-on inclination, low surface brightness, and well defined population II. ------------------------------------------------------------------------------------ 6640( 8) - 09/05/97 10:30 - [ 2] Observations Description ------------------------ We will do a strip survey of the stellar populations of the nuclear region of M33 from the nucleus out to a radial distance of 10 arcmin. We will spend 2 orbits per target field using the WFPC2 instrument with the F555W filter (1 orbit/field) and the F814W filter (1 orbit/field). We have seven targets and will use a total of 14 primary orbits in 7 visits (2 orbits/visit). The first orbit of each visit will have 6 exposures in F814W : 2x800s, 3x160s and 1x40s. The second orbit of each visit will have 6 exposures in F555W : 2x800s and 4x160s. The asymptotic giant branch stars above the tip of the population II red giant branch (I=20.7 mag) will be at least 2.3 magnitudes above our detection limit (I~23.0 mag) for these observations. Real Time Justification ----------------------- None. None. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: Email: ------------------------------------------------------------------------------------ 6640( 8) - 09/05/97 10:30 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC598-SRV1 GALAXY RA=01H 33M 51.00S +/- J2000.0 V = 20 0.01S,DEC=30D 39' 36.0" +/- 0.1" B-V = 0.7 2 NGC598-SRV2 GALAXY RA=01H 33M 51.00S +/- J2000.0 V = 20 0.01S,DEC=30D 38' 6.0" +/- 0.1" B-V = 0.7 3 NGC598-SRV3 GALAXY RA=01H 33M 51.00S +/- J2000.0 V = 20 0.01S,DEC=30D 36' 36.0" +/- 0.1" B-V = 0.7 4 NGC598-SRV4 GALAXY RA=01H 33M 51.00S +/- J2000.0 V = 20 0.01S,DEC=30D 35' 6.0" +/- 0.1" B-V = 0.7 5 NGC598-SRV5 GALAXY RA=01H 33M 51.00S +/- J2000.0 V = 20 0.01S,DEC=30D 33' 36.0" +/- 0.1" B-V = 0.7 6 NGC598-SRV6 GALAXY RA=01H 33M 51.00S +/- J2000.0 V = 20 0.01S,DEC=30D 32' 6.0" +/- 0.1" B-V = 0.7 7 NGC598-SRV7 GALAXY RA=01H 33M 51.00S +/- J2000.0 V = 20 0.01S,DEC=30D 30' 36.0" +/- 0.1" B-V = 0.7 6640( 8) - 09/05/97 10:30 - [ 4] Visit: 01 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Please schedule this as the 1st visit of this program Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC598-SRV1 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 2 800 S ------------------------------------------------------------------------------------------------------------------------------------ 13 NGC598-SRV1 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 3 160 S ------------------------------------------------------------------------------------------------------------------------------------ 16 NGC598-SRV1 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 1 40 S ------------------------------------------------------------------------------------------------------------------------------------ 21 NGC598-SRV1 WFPC2 IMAGE PC1-FIX F555W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 2 800 S ------------------------------------------------------------------------------------------------------------------------------------ 23 NGC598-SRV1 WFPC2 IMAGE PC1-FIX F555W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 4 160 S ------------------------------------------------------------------------------------------------------------------------------------ 6640( 8) - 09/05/97 10:30 - [ 5] Visit: 02 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Please schedule this as the 2nd visit of this program Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC598-SRV2 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 2 800 S ------------------------------------------------------------------------------------------------------------------------------------ 13 NGC598-SRV2 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 3 160 S ------------------------------------------------------------------------------------------------------------------------------------ 16 NGC598-SRV2 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 1 40 S ------------------------------------------------------------------------------------------------------------------------------------ 21 NGC598-SRV2 WFPC2 IMAGE PC1-FIX F555W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 2 800 S ------------------------------------------------------------------------------------------------------------------------------------ 23 NGC598-SRV2 WFPC2 IMAGE PC1-FIX F555W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 4 160 S ------------------------------------------------------------------------------------------------------------------------------------ 6640( 8) - 09/05/97 10:30 - [ 6] Visit: 03 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Please schedule this as the 3rd visit of this program Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC598-SRV3 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 2 800 S ------------------------------------------------------------------------------------------------------------------------------------ 13 NGC598-SRV3 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 3 160 S ------------------------------------------------------------------------------------------------------------------------------------ 16 NGC598-SRV3 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 1 40 S ------------------------------------------------------------------------------------------------------------------------------------ 21 NGC598-SRV3 WFPC2 IMAGE PC1-FIX F555W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 2 800 S ------------------------------------------------------------------------------------------------------------------------------------ 23 NGC598-SRV3 WFPC2 IMAGE PC1-FIX F555W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 4 160 S ------------------------------------------------------------------------------------------------------------------------------------ 6640( 8) - 09/05/97 10:30 - [ 7] Visit: 04 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Please schedule this as the 4th visit of this program Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC598-SRV4 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 2 800 S ------------------------------------------------------------------------------------------------------------------------------------ 13 NGC598-SRV4 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 3 160 S ------------------------------------------------------------------------------------------------------------------------------------ 16 NGC598-SRV4 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 1 40 S ------------------------------------------------------------------------------------------------------------------------------------ 21 NGC598-SRV4 WFPC2 IMAGE PC1-FIX F555W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 2 800 S ------------------------------------------------------------------------------------------------------------------------------------ 23 NGC598-SRV4 WFPC2 IMAGE PC1-FIX F555W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 4 160 S ------------------------------------------------------------------------------------------------------------------------------------ 6640( 8) - 09/05/97 10:30 - [ 8] Visit: 05 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Please schedule this as the 5th visit of this program Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC598-SRV5 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 2 800 S ------------------------------------------------------------------------------------------------------------------------------------ 13 NGC598-SRV5 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 3 160 S ------------------------------------------------------------------------------------------------------------------------------------ 16 NGC598-SRV5 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 1 40 S ------------------------------------------------------------------------------------------------------------------------------------ 21 NGC598-SRV5 WFPC2 IMAGE PC1-FIX F555W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 2 800 S ------------------------------------------------------------------------------------------------------------------------------------ 23 NGC598-SRV5 WFPC2 IMAGE PC1-FIX F555W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 4 160 S ------------------------------------------------------------------------------------------------------------------------------------ 6640( 8) - 09/05/97 10:30 - [ 9] Visit: 06 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Please schedule this as the 6th visit of this program Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC598-SRV6 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 2 800 S ------------------------------------------------------------------------------------------------------------------------------------ 13 NGC598-SRV6 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 3 160 S ------------------------------------------------------------------------------------------------------------------------------------ 16 NGC598-SRV6 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 1 40 S ------------------------------------------------------------------------------------------------------------------------------------ 21 NGC598-SRV6 WFPC2 IMAGE PC1-FIX F555W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 2 800 S ------------------------------------------------------------------------------------------------------------------------------------ 23 NGC598-SRV6 WFPC2 IMAGE PC1-FIX F555W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 4 160 S ------------------------------------------------------------------------------------------------------------------------------------ 6640( 8) - 09/05/97 10:30 - [ 10] Visit: 07 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Please schedule this as the 7th visit of this program Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 NGC598-SRV7 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 2 800 S ------------------------------------------------------------------------------------------------------------------------------------ 13 NGC598-SRV7 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 3 160 S ------------------------------------------------------------------------------------------------------------------------------------ 16 NGC598-SRV7 WFPC2 IMAGE PC1-FIX F814W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 1 40 S ------------------------------------------------------------------------------------------------------------------------------------ 21 NGC598-SRV7 WFPC2 IMAGE PC1-FIX F555W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 2 800 S ------------------------------------------------------------------------------------------------------------------------------------ 23 NGC598-SRV7 WFPC2 IMAGE PC1-FIX F555W CLOCKS=NO,ATD-GAIN=7,CR-SPLIT=NO 4 160 S ------------------------------------------------------------------------------------------------------------------------------------ 6640( 8) - 09/05/97 10:30 - [ 11] Summary Form for Proposal 6640 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CLOCKS=NO ATD-GAIN=7 CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR POPULATIONS ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F814W F555W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC598-SRV1 NGC598-SRV2 NGC598-SRV3 NGC598-SRV4 NGC598-SRV5 NGC598-SRV6 NGC598-SRV7 ------------------------------------------------------------------------------------------------------------------------------------