! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template ! Id: 6102 Proposal_Information Title: Chemical Evolution and History of Star Formation in the Large Magellanic Cloud Proposal_Category: GO Scientific_Category: Stellar Populations Cycle: 5 Investigators PI_name: Bengt Gustafsson PI_Institution: Uppsala Astronomical Observatory CoI_Name: Arne Ardeberg CoI_Institution: Lund Observatory Contact: ! Y or N (designate at most one contact) CoI_Name: Peter Linde CoI_Institution: Lund Observatory Contact: Y ! Y or N (designate at most one contact) ! Changed by RS 950306 CoI_Name: Poul-Erik Nissen CoI_Institution: University of Aarhus Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) 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. Questions ! Free format text (please update) Observing_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. !Inserted from original proposal, some conversion to ascii, RS 950306 Real_Time_Justification: Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: !============================================================================== Fixed_Targets ! Section 5.1 Target_Number: 1 Target_Name: LMC-BAR Alternate_Names: Description: GALAXY, Bar, EXT-STAR, F0-F2, F3-F9, G V-IV, K V-IV Position: RA=5H 20M 52.2S +/- 1.0S, DEC=-69D 35' 31.0" +/- 7.0", PLATE-ID=05ZW Equinox: 2000 Flux: V = 16, B-V = 0.5 Comments: Target_Number: 2 Target_Name: NGC5139 Alternate_Names: OMEGA-CEN Description: STELLAR CLUSTER, Globular Cluster !Coord 2000.0 = 13 26 46 -47 28.6 sp type = ?... Position: RA=13H 26M 12.05S +/- 0.1S, DEC=-47D 33' 58.60" +/- 0.1", PLATE-ID=00AK Equinox: 2000 Flux: V = 16, B-V = 0.4 Target_Number: 3 Target_Name: NGC2682-FIELD1 Alternate_Names: M67 Description: STELLAR CLUSTER, Open Cluster !Coord 2000.0 = 08 50.4 +11 49 sp type = ? Position: RA=08H 51M 26.4S +/- 0.1S, DEC=11D 49' 19" +/- 1.0", PLATE-ID=028I Equinox: 2000 Flux: V=12.251, B-V=0.25 Target_Number: 4 Target_Name: NGC2682-FIELD2 Alternate_Names: M67 Description: STELLAR CLUSTER, Open Cluster !Coord 2000.0 = 08 50.4 +11 49 sp type = ? Position: RA=08H 51M 20.5S +/- 0.1S, DEC=11D 45' 53" +/- 1.0", PLATE-ID=028I Equinox: 2000 Flux: V=12.251, B-V=0.25 !============================================================================== Visits Visit_Number: 1 !============== Visit_Requirements: CVZ BEFORE 01-NOV-95 Scan_Data Scan_Number: 1 FGS_Scan: Cont_or_Dwell: D Dwell_Points: 2 Dwell_Secs: 1 Scan_Width: 0.490108 Scan_Length: 0.490108 Sides_Angle: 90.0 Number_Lines: 2 Scan_Rate: First_Line_PA: 30.726 Scan_Frame: S/C Length_Offset: 0.0 Width_Offset: 0.0 Exposure_Number: 1 Target_Name: LMC-BAR Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F467M Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=7,SCAN-READ=ALL Number_of_Iterations: 1 Time_Per_Exposure: 700S Special_Requirements: SPATIAL SCAN 1 1-2 Exposure_Number: 2 Target_Name: LMC-BAR Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F547M Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=7,SCAN-READ=ALL Number_of_Iterations: 1 Time_Per_Exposure: 160S Special_Requirements: Visit_Number: 2 !============== Visit_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. Visit_Requirements: GROUP 2,3,10 WITHIN 6D AFTER 01-NOV-95 Scan_Data ! Appendix B Scan_Number: 2 FGS_Scan: Cont_or_Dwell: D Dwell_Points: 2 Dwell_Secs: 1 Scan_Width: 0.490108 Scan_Length: 0.490108 Sides_Angle: 90.0 Number_Lines: 2 Scan_Rate: First_Line_PA: 30.726 Scan_Frame: S/C Length_Offset: 0.0 Width_Offset: 0.0 Exposure_Number: 1 Target_Name: LMC-BAR Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F547M Optional_Parameters: ATD-GAIN=7,SCAN-READ=ALL,CR-SPLIT=NO Number_of_Iterations: 2 Time_Per_Exposure: 200S Special_Requirements: SPATIAL SCAN 2 Exposure_Number: 10 Target_Name: LMC-BAR Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F336W Optional_Parameters: ATD-GAIN=7,SCAN-READ=ALL,CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: SPATIAL SCAN 2 Exposure_Number: 11 Target_Name: LMC-BAR Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F336W Optional_Parameters: ATD-GAIN=7,SCAN-READ=ALL,CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: SPATIAL SCAN 2 Exposure_Number: 20 Target_Name: LMC-BAR Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F410M Optional_Parameters: ATD-GAIN=7,SCAN-READ=ALL,CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: SPATIAL SCAN 2 Exposure_Number: 21 Target_Name: LMC-BAR Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F410M Optional_Parameters: ATD-GAIN=7,SCAN-READ=ALL,CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: SPATIAL SCAN 2 Exposure_Number: 22 Target_Name: LMC-BAR Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F410M Optional_Parameters: ATD-GAIN=7,SCAN-READ=ALL,CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: SPATIAL SCAN 2 Visit_Number: 3 !============== Visit_Requirements: AFTER 01-NOV-95 SAME ORIENT AS 2 Scan_Data Scan_Number: 3 FGS_Scan: Cont_or_Dwell: D Dwell_Points: 2 Dwell_Secs: 1 Scan_Width: 0.490108 Scan_Length: 0.490108 Sides_Angle: 90.0 Number_Lines: 2 Scan_Rate: First_Line_PA: 30.726 Scan_Frame: S/C Length_Offset: 0.0 Width_Offset: 0.0 Exposure_Number: 1 Target_Name: LMC-BAR Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F547M Optional_Parameters: ATD-GAIN=7,SCAN-READ=ALL,CR-SPLIT=NO Number_of_Iterations: 2 Time_Per_Exposure: 200S Special_Requirements: SPATIAL SCAN 3 Exposure_Number: 10 Target_Name: LMC-BAR Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F336W Optional_Parameters: ATD-GAIN=7,SCAN-READ=ALL,CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: SPATIAL SCAN 3 Exposure_Number: 11 Target_Name: LMC-BAR Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F336W Optional_Parameters: ATD-GAIN=7,SCAN-READ=ALL,CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: SPATIAL SCAN 3 Exposure_Number: 20 Target_Name: LMC-BAR Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F410M Optional_Parameters: ATD-GAIN=7,SCAN-READ=ALL,CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: SPATIAL SCAN 3 Exposure_Number: 21 Target_Name: LMC-BAR Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F410M Optional_Parameters: ATD-GAIN=7,SCAN-READ=ALL,CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: SPATIAL SCAN 3 Exposure_Number: 22 Target_Name: LMC-BAR Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F410M Optional_Parameters: ATD-GAIN=7,SCAN-READ=ALL,CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: SPATIAL SCAN 3 Visit_Number: 10 !============== Visit_Requirements: AFTER 01-NOV-95 SAME ORIENT AS 2 Scan_Data Scan_Number: 10 FGS_Scan: Cont_or_Dwell: D Dwell_Points: 2 Dwell_Secs: 1 Scan_Width: 0.490108 Scan_Length: 0.490108 Sides_Angle: 90.0 Number_Lines: 2 Scan_Rate: First_Line_PA: 30.726 Scan_Frame: S/C Length_Offset: 0.0 Width_Offset: 0.0 Exposure_Number: 30 Target_Name: LMC-BAR Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F467M Optional_Parameters: ATD-GAIN=7,SCAN-READ=ALL,CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 700S Special_Requirements: SPATIAL SCAN 10 Exposure_Number: 31 Target_Name: LMC-BAR Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F467M Optional_Parameters: ATD-GAIN=7,SCAN-READ=ALL,CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: SPATIAL SCAN 10 Exposure_Number: 32 Target_Name: LMC-BAR Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F467M Optional_Parameters: ATD-GAIN=7,SCAN-READ=ALL,CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: SPATIAL SCAN 10 Exposure_Number: 33 Target_Name: LMC-BAR Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F467M Optional_Parameters: ATD-GAIN=7,SCAN-READ=ALL,CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: SPATIAL SCAN 10 Visit_Number: 4 !============== Visit_Requirements: Visit_Comments: Possible guide stars only available in W, SW, and S Scan_Data ! Appendix B Scan_Number: 4 FGS_Scan: Cont_or_Dwell: D Dwell_Points: 2 Dwell_Secs: 1 Scan_Width: 0.490108 Scan_Length: 0.490108 Sides_Angle: 90.0 Number_Lines: 2 Scan_Rate: First_Line_PA: 30.726 Scan_Frame: S/C Length_Offset: 0.0 Width_Offset: 0.0 Exposure_Number: 1 Target_Name: NGC5139 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F336W Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=7,SCAN-READ=ALL Number_of_Iterations: 2 Time_Per_Exposure: 400S Special_Requirements: SPATIAL SCAN 4 1-4 Exposure_Number: 2 Target_Name: NGC5139 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F410M Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=7,SCAN-READ=ALL Number_of_Iterations: 2 Time_Per_Exposure: 300S Special_Requirements: Exposure_Number: 3 Target_Name: NGC5139 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F467M Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=7,SCAN-READ=ALL Number_of_Iterations: 2 Time_Per_Exposure: 200S Special_Requirements: Exposure_Number: 4 Target_Name: NGC5139 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F547M Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=7,SCAN-READ=ALL Number_of_Iterations: 1 Time_Per_Exposure: 50S Special_Requirements: Visit_Number: 5 !============== Visit_Requirements: ORIENT 313D TO 319D Scan_Data ! Appendix B Scan_Number: 5 FGS_Scan: Cont_or_Dwell: D Dwell_Points: 2 Dwell_Secs: 1 Scan_Width: 0.490108 Scan_Length: 0.490108 Sides_Angle: 90.0 Number_Lines: 2 Scan_Rate: First_Line_PA: 30.726 Scan_Frame: S/C Length_Offset: 0.0 Width_Offset: 0.0 Exposure_Number: 1 Target_Name: NGC2682-FIELD1 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F336W Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=7,SCAN-READ=ALL Number_of_Iterations: 1 Time_Per_Exposure: 8S Special_Requirements: SPATIAL SCAN 5 1-4 Exposure_Number: 2 Target_Name: NGC2682-FIELD1 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F410M Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=7,SCAN-READ=ALL Number_of_Iterations: 1 Time_Per_Exposure: 6S Special_Requirements: Exposure_Number: 3 Target_Name: NGC2682-FIELD1 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F467M Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=7,SCAN-READ=ALL Number_of_Iterations: 1 Time_Per_Exposure: 3S Special_Requirements: Exposure_Number: 4 Target_Name: NGC2682-FIELD1 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F547M Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=7,SCAN-READ=ALL Number_of_Iterations: 1 Time_Per_Exposure: 0.50S Special_Requirements: Visit_Number: 6 !============== Visit_Requirements: ORIENT 100D TO 104D Scan_Data ! Appendix B Scan_Number: 6 FGS_Scan: Cont_or_Dwell: D Dwell_Points: 2 Dwell_Secs: 1 Scan_Width: 0.490108 Scan_Length: 0.490108 Sides_Angle: 90.0 Number_Lines: 2 Scan_Rate: First_Line_PA: 30.726 Scan_Frame: S/C Length_Offset: 0.0 Width_Offset: 0.0 Exposure_Number: 1 Target_Name: NGC2682-FIELD2 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F336W Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=7,SCAN-READ=ALL Number_of_Iterations: 1 Time_Per_Exposure: 8S Special_Requirements: SPATIAL SCAN 6 1-4 Exposure_Number: 2 Target_Name: NGC2682-FIELD2 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F410M Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=7,SCAN-READ=ALL Number_of_Iterations: 1 Time_Per_Exposure: 6S Special_Requirements: Exposure_Number: 3 Target_Name: NGC2682-FIELD2 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F467M Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=7,SCAN-READ=ALL Number_of_Iterations: 1 Time_Per_Exposure: 3S Special_Requirements: Exposure_Number: 4 Target_Name: NGC2682-FIELD2 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F547M Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=7,SCAN-READ=ALL Number_of_Iterations: 1 Time_Per_Exposure: 0.50S Special_Requirements: Data_Distribution ! Defaults indicated; change if desired Medium: 6250BPI ! 8MM or 6250BPI or 1600BPI ! NOTE: preferably DAT tape Blocking_Factor: 10 ! 10 or 1 ! Only astronomers with very old 9- ! track tape drives should consider ! a blocking factor of 1 Ship_To: Peter Linde ! STSCI or PI_Address or Lund Observatory Box 43, S-221 00 Lund, Sweden ! ! Ship_Via: UPS ! UPS (2-day) or OVERNIGHT ! Overnight shipping done at PI expense Recipient_Email: peter@astro.lu.se ! Needed if Ship_To: is not PI_Address !