6102( 16) - 02/26/96 10:00 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6102 Version: 16 Check-in Date: 26-Feb-1996 09:55:16 1.Proposal Title: Chemical Evolution and History of Star Formation in the Large Magellanic Cloud ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Stellar Populations GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Bengt Gustafsson Uppsala Astronomical Observatory CoI: Arne Ardeberg Lund Observatory N CoI: Peter Linde Lund Observatory Y CoI: Poul-Erik Nissen University of Aarhus N ------------------------------------------------------------------------------------ 6. Abstract Large scale processes controlling star formation and nucleosynthesis are fundamental but poorly understood. This is especially true for external galaxies. A detailed study of individual main sequence stars in the LMC Bar is proposed. The LMC is close enough to allow this, has considerable spread in stellar ages and a structure permitting identification of stellar populations and their structural features. The Bar presumably plays a dominant role in the chemical and dynamical evolution of the galaxy. Our knowledge is, at best, based on educated guesses. Still, the major population of the Bar is quite old, and many member stars are relatively evolved. The Bar seems to contain stars similar to those of Intermediate to Extreme Pop II in the Galaxy. We want to study the history of star formation, chemical evolution and initial mass function of the population dominating the Bar. We will use field stars close to the turn off point in the HR diagram. From earlier studies, we know that 250-500 such stars are available for uvby photometry in the PC field. We aim at an accuracy of 0.1 -0.2 dex in Me/H and 25% or better in relative ages. This requires an accuracy of about 0.02 mag in the uvby indices, which can be reached, taking into account errors in calibration, flat fielding, guiding and problems due to crowding. For a study of the luminosity function fainter stars will be included as well. Calibration fields are available in Omega Cen and M 67. ------------------------------------------------------------------------------------ 6102( 16) - 02/26/96 10:00 - [ 2] Observations Description ------------------------ We need to obtain two sets of photometric data on the HST PC uvby instrumental system. One set concerns our LMC programme stars. The other set will be obtained for uvby system reference stars. These stars belong to the globular cluster NGC 5139 (Omega Cen) and to the old open cluster NGC 2682 (M 67) (Nissen et al., 1987). The reference stars in Omega Cen were specially selected for this purpose and were observed by us in the uvby system with large earth based telescopes together with suitable standard stars on the international uvby system. From these observing data, the reference stars in Omega Cen were carefully tied into this system. These stars cover an interval in [Me/H] of approximately -0.8 to -1.6, while the reference stars in M 67 cover a corresponding interval from 0.0 to -0.2. Observations of the Omega Cen and M 67 reference stars with the HST PC will take adequate care of conversion of the observed LMC uvby data into corresponding data on the international uvby system. As a support for our determination of the luminosity function in the LMC Bar, we propose to use the Wide Field Camera in parallel with the Planetary Camera. In addition to further extending the observing material, the WFC data will provide us with a possibility to investigate possible local variations of the luminosity function. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 6250BPI Blocking Factor: 10 Ship To: Peter Linde*Lund Observatory*Box 43, S- 221 00*Lund, Sweden Ship Via: UPS Email: peter@astro.lu.se , ------------------------------------------------------------------------------------ 6102( 16) - 02/26/96 10:00 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 LMC-BAR GALAXY, Bar, EXT-STAR, RA=5H 20M 52.2S +/- 1.0S, DEC=- 2000 V = 16 F0-F2, F3-F9, G V-IV, K 69D 35' 31.0" +/- 7.0", PLATE- B-V = 0.5 V-IV ID=05ZW 2 NGC5139 STELLAR CLUSTER, RA=13H 26M 12.05S +/- 0.1S, DEC= 2000 V = 16 Globular Cluster -47D 33' 58.60" +/- 0.1", PLATE- B-V = 0.4 ID=00AK 3 NGC2682- STELLAR CLUSTER, Open RA=08H 51M 26.4S +/- 0.1S, 2000 V = 12.251 FIELD1 Cluster DEC=11D 49' 19" +/- 1.0", PLATE- B-V = 0.25 ID=028I 4 NGC2682- STELLAR CLUSTER, Open RA=08H 51M 20.5S +/- 0.1S, 2000 V = 12.251 FIELD2 Cluster DEC=11D 45' 53" +/- 1.0", PLATE- B-V = 0.25 ID=028I 6102( 16) - 02/26/96 10:00 - [ 4] Visit: 01 Visit Requirements: CVZ BEFORE 01-NOV-95 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 LMC-BAR WFPC2 IMAGE PC1-FIX F467M CR-SPLIT=NO,ATD 1 700S SPATIAL SCAN 1 1-2 -GAIN=7,SCAN- READ=ALL ------------------------------------------------------------------------------------------------------------------------------------ 2 LMC-BAR WFPC2 IMAGE PC1-FIX F547M CR-SPLIT=NO,ATD 1 160S -GAIN=7,SCAN- READ=ALL ------------------------------------------------------------------------------------------------------------------------------------ 6102( 16) - 02/26/96 10:00 - [ 5] Visit: 02 Visit Requirements: GROUP 2,3,10 WITHIN 6D AFTER 01-NOV-95 On Hold Comments: Additional Comments: This visit was intended to be done in the CVZ, but due to scheduling conflicts it has to be done in near-CVZ orbits. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 LMC-BAR WFPC2 IMAGE PC1-FIX F547M ATD-GAIN=7,SCAN 2 200S SPATIAL SCAN 2 -READ=ALL,CR- SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 10 LMC-BAR WFPC2 IMAGE PC1-FIX F336W ATD-GAIN=7,SCAN 1 800S SPATIAL SCAN 2 -READ=ALL,CR- SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 11 LMC-BAR WFPC2 IMAGE PC1-FIX F336W ATD-GAIN=7,SCAN 1 800S SPATIAL SCAN 2 -READ=ALL,CR- SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 20 LMC-BAR WFPC2 IMAGE PC1-FIX F410M ATD-GAIN=7,SCAN 1 800S SPATIAL SCAN 2 -READ=ALL,CR- SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 21 LMC-BAR WFPC2 IMAGE PC1-FIX F410M ATD-GAIN=7,SCAN 1 800S SPATIAL SCAN 2 -READ=ALL,CR- SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 22 LMC-BAR WFPC2 IMAGE PC1-FIX F410M ATD-GAIN=7,SCAN 1 800S SPATIAL SCAN 2 -READ=ALL,CR- SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 6102( 16) - 02/26/96 10:00 - [ 6] Visit: 03 Visit Requirements: AFTER 01-NOV-95 SAME ORIENT AS 2 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 LMC-BAR WFPC2 IMAGE PC1-FIX F547M ATD-GAIN=7,SCAN 2 200S SPATIAL SCAN 3 -READ=ALL,CR- SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 10 LMC-BAR WFPC2 IMAGE PC1-FIX F336W ATD-GAIN=7,SCAN 1 800S SPATIAL SCAN 3 -READ=ALL,CR- SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 11 LMC-BAR WFPC2 IMAGE PC1-FIX F336W ATD-GAIN=7,SCAN 1 800S SPATIAL SCAN 3 -READ=ALL,CR- SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 20 LMC-BAR WFPC2 IMAGE PC1-FIX F410M ATD-GAIN=7,SCAN 1 800S SPATIAL SCAN 3 -READ=ALL,CR- SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 21 LMC-BAR WFPC2 IMAGE PC1-FIX F410M ATD-GAIN=7,SCAN 1 800S SPATIAL SCAN 3 -READ=ALL,CR- SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 22 LMC-BAR WFPC2 IMAGE PC1-FIX F410M ATD-GAIN=7,SCAN 1 800S SPATIAL SCAN 3 -READ=ALL,CR- SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 6102( 16) - 02/26/96 10:00 - [ 7] Visit: 10 Visit Requirements: AFTER 01-NOV-95 SAME ORIENT AS 2 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 ------------------------------------------------------------------------------------------------------------------------------------ 30 LMC-BAR WFPC2 IMAGE PC1-FIX F467M ATD-GAIN=7,SCAN 1 700S SPATIAL SCAN 10 -READ=ALL,CR- SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 31 LMC-BAR WFPC2 IMAGE PC1-FIX F467M ATD-GAIN=7,SCAN 1 800S SPATIAL SCAN 10 -READ=ALL,CR- SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 32 LMC-BAR WFPC2 IMAGE PC1-FIX F467M ATD-GAIN=7,SCAN 1 800S SPATIAL SCAN 10 -READ=ALL,CR- SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 33 LMC-BAR WFPC2 IMAGE PC1-FIX F467M ATD-GAIN=7,SCAN 1 800S SPATIAL SCAN 10 -READ=ALL,CR- SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ 6102( 16) - 02/26/96 10:00 - [ 8] Visit: 04 Visit Requirements: On Hold Comments: Additional Comments: Possible guide stars only available in W, SW, and S Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC5139 WFPC2 IMAGE PC1-FIX F336W CR-SPLIT=NO,ATD 2 400S SPATIAL SCAN 4 1-4 -GAIN=7,SCAN- READ=ALL ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC5139 WFPC2 IMAGE PC1-FIX F410M CR-SPLIT=NO,ATD 2 300S -GAIN=7,SCAN- READ=ALL ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC5139 WFPC2 IMAGE PC1-FIX F467M CR-SPLIT=NO,ATD 2 200S -GAIN=7,SCAN- READ=ALL ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC5139 WFPC2 IMAGE PC1-FIX F547M CR-SPLIT=NO,ATD 1 50S -GAIN=7,SCAN- READ=ALL ------------------------------------------------------------------------------------------------------------------------------------ 6102( 16) - 02/26/96 10:00 - [ 9] Visit: 05 Visit Requirements: ORIENT 313D TO 319D 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 NGC2682- WFPC2 IMAGE PC1-FIX F336W CR-SPLIT=NO,ATD 1 8S SPATIAL SCAN 5 1-4 FIELD1 -GAIN=7,SCAN- READ=ALL ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC2682- WFPC2 IMAGE PC1-FIX F410M CR-SPLIT=NO,ATD 1 6S FIELD1 -GAIN=7,SCAN- READ=ALL ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC2682- WFPC2 IMAGE PC1-FIX F467M CR-SPLIT=NO,ATD 1 3S FIELD1 -GAIN=7,SCAN- READ=ALL ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC2682- WFPC2 IMAGE PC1-FIX F547M CR-SPLIT=NO,ATD 1 0.50S FIELD1 -GAIN=7,SCAN- READ=ALL ------------------------------------------------------------------------------------------------------------------------------------ 6102( 16) - 02/26/96 10:00 - [ 10] Visit: 06 Visit Requirements: ORIENT 100D TO 104D 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 NGC2682- WFPC2 IMAGE PC1-FIX F336W CR-SPLIT=NO,ATD 1 8S SPATIAL SCAN 6 1-4 FIELD2 -GAIN=7,SCAN- READ=ALL ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC2682- WFPC2 IMAGE PC1-FIX F410M CR-SPLIT=NO,ATD 1 6S FIELD2 -GAIN=7,SCAN- READ=ALL ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC2682- WFPC2 IMAGE PC1-FIX F467M CR-SPLIT=NO,ATD 1 3S FIELD2 -GAIN=7,SCAN- READ=ALL ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC2682- WFPC2 IMAGE PC1-FIX F547M CR-SPLIT=NO,ATD 1 0.50S FIELD2 -GAIN=7,SCAN- READ=ALL ------------------------------------------------------------------------------------------------------------------------------------ 6102( 16) - 02/26/96 10:00 - [ 11] Scan Paramters Form ------------------------------------------------------------------------------------------------------------------------------------ Data ID: 1 Exposure Logsheet lines: 1.001-1.002 FGS Scan: D Dwell Only: dwell points/line: 2 Seconds per dwell: 1.00 Scan width (arc-secs): 0.4901 Scan length (arc-secs): 0.4901 Angle between sides (degrees) 90.00 Number of lines: 2 Scan rate (arc-sec/sec): 0.0000 PA of first scan line (degrees) 30.726 Scan frame (CEL or S/C): S/C Length Offset (arc-sec): 0.0 Width Offset (arc-sec): 0.0 ------------------------------------------------------------------------------------------------------------------------------------ Data ID: 2 Exposure Logsheet lines: 2.001,2.010,2.011,2.0 FGS Scan: D Dwell Only: dwell points/line: 2 Seconds per dwell: 1.00 Scan width (arc-secs): 0.4901 Scan length (arc-secs): 0.4901 Angle between sides (degrees) 90.00 Number of lines: 2 Scan rate (arc-sec/sec): 0.0000 PA of first scan line (degrees) 30.726 Scan frame (CEL or S/C): S/C Length Offset (arc-sec): 0.0 Width Offset (arc-sec): 0.0 ------------------------------------------------------------------------------------------------------------------------------------ Data ID: 3 Exposure Logsheet lines: 3.001,3.010,3.011,3.0 FGS Scan: D Dwell Only: dwell points/line: 2 Seconds per dwell: 1.00 Scan width (arc-secs): 0.4901 Scan length (arc-secs): 0.4901 Angle between sides (degrees) 90.00 Number of lines: 2 Scan rate (arc-sec/sec): 0.0000 PA of first scan line (degrees) 30.726 Scan frame (CEL or S/C): S/C Length Offset (arc-sec): 0.0 Width Offset (arc-sec): 0.0 ------------------------------------------------------------------------------------------------------------------------------------ Data ID: 4 Exposure Logsheet lines: 5.001-5.004 FGS Scan: D Dwell Only: dwell points/line: 2 Seconds per dwell: 1.00 Scan width (arc-secs): 0.4901 Scan length (arc-secs): 0.4901 Angle between sides (degrees) 90.00 Number of lines: 2 Scan rate (arc-sec/sec): 0.0000 PA of first scan line (degrees) 30.726 Scan frame (CEL or S/C): S/C Length Offset (arc-sec): 0.0 Width Offset (arc-sec): 0.0 ------------------------------------------------------------------------------------------------------------------------------------ Data ID: 5 Exposure Logsheet lines: 6.001-6.004 FGS Scan: D Dwell Only: dwell points/line: 2 Seconds per dwell: 1.00 Scan width (arc-secs): 0.4901 Scan length (arc-secs): 0.4901 Angle between sides (degrees) 90.00 Number of lines: 2 Scan rate (arc-sec/sec): 0.0000 PA of first scan line (degrees) 30.726 Scan frame (CEL or S/C): S/C Length Offset (arc-sec): 0.0 Width Offset (arc-sec): 0.0 ------------------------------------------------------------------------------------------------------------------------------------ Data ID: 6 Exposure Logsheet lines: 7.001-7.004 FGS Scan: D Dwell Only: dwell points/line: 2 Seconds per dwell: 1.00 Scan width (arc-secs): 0.4901 Scan length (arc-secs): 0.4901 Angle between sides (degrees) 90.00 Number of lines: 2 Scan rate (arc-sec/sec): 0.0000 PA of first scan line (degrees) 30.726 Scan frame (CEL or S/C): S/C Length Offset (arc-sec): 0.0 Width Offset (arc-sec): 0.0 ------------------------------------------------------------------------------------------------------------------------------------ Data ID: 10 Exposure Logsheet lines: 4.030,4.031,4.032,4.0 FGS Scan: D Dwell Only: dwell points/line: 2 Seconds per dwell: 1.00 Scan width (arc-secs): 0.4901 Scan length (arc-secs): 0.4901 Angle between sides (degrees) 90.00 Number of lines: 2 Scan rate (arc-sec/sec): 0.0000 PA of first scan line (degrees) 30.726 Scan frame (CEL or S/C): S/C Length Offset (arc-sec): 0.0 Width Offset (arc-sec): 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 6102( 16) - 02/26/96 10:00 - [ 12] Summary Form for Proposal 6102 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ATD-GAIN=7 SCAN-READ=ALL ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Stellar Populations ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CVZ BEFORE 01-NOV-95 SPATIAL SCAN 1 1-2 GROUP 2,3,10 WITHIN 6D AFTER 01-NOV-95 SPATIAL SCAN 2 AFTER 01-NOV-95 SAME ORIENT AS 2 SPATIAL SCAN 3 SPATIAL SCAN 10 SPATIAL SCAN 4 1-4 ORIENT 313D TO 319D SPATIAL SCAN 5 1-4 ORIENT 100D TO 104D SPATIAL SCAN 6 1-4 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F467M F547M F336W F410M ------------------------------------------------------------------------------------------------------------------------------------ Target Names LMC-BAR NGC5139 NGC2682-FIELD1 NGC2682-FIELD2 ------------------------------------------------------------------------------------------------------------------------------------