! +====================+ ! | PED OUTPUT PRODUCT | ! +====================+ ! ! /data/frodo1/aroman/work/6860.prop ! Generated by PREPROCESSOR, version 7.1.1b ! Date: Tue Jul 01 15:43:39 EDT 1997 Proposal_Information Title: STELLAR POPULATIONS IN THE SMC Proposal_Category: GTO/WF2 Scientific_Category: STELLAR POPULATIONS Cycle: 6 Investigators PI_Name: TRAUGER, JOHN PI_Institution: JET PROPULSION LABORATORY CoI_Name: Jon Holtzman CoI_Institution: Lowell Observatory Contact: CoI_Name: Jay Gallagher CoI_Institution: University of Wisconsin Contact: CoI_Name: Jeremy Mould CoI_Institution: Mount Stromlo Observatory Contact: Abstract: The Magellanic Clouds (MC) are the nearest major galaxies and therefore afford unique opportunities for studies of stellar populations and star formation histories through observations of color-magnitude diagrams (CMDs; e.g. Bertelli et al. 1992, ApJ, 388, 400). In this program we extend HST WFPC2 studies of low mass stars in the LMC through observations of a field in the SMC which is near the bar. The resulting CMDs will be modelled using isochrones such as those by Bergbusch & Vandenberg (1992, ApJS, 81, 163) to recover the lower stellar IMF and to search for the signatures of episodic star formation in these galaxies. Questions Observing_Description: Color-magnitude diagrams are well established as powerful tools for investigating galactic stellar populations. In cases such as the LMC and SMC where HST allows observations to be made to well below the oldest main sequence turnoff, we can recover information about the form of the stellar IMF and the history of star formation (e.g., Mighell \\& Butcher 1992, AA, 255, 26). In Cycle 4 the WFPC2 IDT obtained a CMD which is reasonably complete to V=27 (M_V=8) for an outer disk field in the LMC. These data demonstrate that this region has experienced episodic star forming events which appear as three well-defined main sequence turn-offs which are separated by gaps. This behavior is consistent with star formation ceasing for extended times. We also have obtained the first reliable stellar LF for the lower main sequence in another galaxy, which we are now analyzing (c.f., Bessell \\& Stringfellow 1993, ARAA, 31, 433). A Cycle 5 GTO program was proposed to obtain high quality photometric data in the F555W and F814W filters for more fields in the LMC with the goal of testing the uniformity of stellar populations in the LMC. Also, a single SMC field was proposed. In all cases make more effective use of the PC was made by centering on a small star cluster of the type which abound in the Magellanic Clouds (e.g., Hodge 1980, AJ, 85, 423; Hodge 1986, PASP, 98, 1113). These data have not yet been fully analyzed. Our Cycle 6 proposal adds one additional SMC field, so we will have more than one sample of the stellar populations in the SMC. Real_Time_Justification: Calibration_Justification: Additional_Comments: Fixed_Targets Target_Number: 1 Target_Name: SMC-L31 Alternate_Names: Description: GALAXY Position: RA=0H 46M 33.87S +/- 0.010S,DEC=-72D 44' 33.6" +/- 0.10",PLATE-ID=06B1 Equinox: J2000 RV_or_Z: RA_PM: 0.0 Dec_PM: 0.0 Epoch: Annual_Parallax: 0.0 Flux: V = 27 Comments: Solar_System_Targets Generic_Targets Scan_Data Visits Visit_Number: 01 Visit_Requirements: ORIENT 0D TO 359D On_Hold_Comments: Visit_Comments: Exposure_Number: 10 Target_Name: SMC-L31 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 300 S Special_Requirements: NO SPLIT PAR 22 WITH 10-21 Comments: Exposure_Number: 20 Target_Name: SMC-L31 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 1000 S Special_Requirements: SAME POS AS 10 NO SPLIT Comments: Exposure_Number: 21 Target_Name: SMC-L31 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 1300 S Special_Requirements: SAME POS AS 10 NO SPLIT Comments: Exposure_Number: 22 Target_Name: SMC-L31 Config: NIC2 Opmode: MULTIACCUM Aperture: NIC2-FIX Sp_Element: F110W Wavelength: Optional_Parameters: SAMP-SEQ=SPARS256,NSAMP=12 Number_of_Iterations: 1 Time_Per_Exposure: DEF Special_Requirements: Comments: Exposure_Number: 25 Target_Name: SMC-L31 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 1300 S Special_Requirements: SAME POS AS 10 NO SPLIT PAR 27 WITH 25-26 Comments: Exposure_Number: 26 Target_Name: SMC-L31 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F555W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 1600 S Special_Requirements: SAME POS AS 10 NO SPLIT Comments: Exposure_Number: 27 Target_Name: SMC-L31 Config: NIC2 Opmode: MULTIACCUM Aperture: NIC2-FIX Sp_Element: F110W Wavelength: Optional_Parameters: SAMP-SEQ=SPARS256,NSAMP=12 Number_of_Iterations: 1 Time_Per_Exposure: DEF Special_Requirements: Comments: Exposure_Number: 30 Target_Name: SMC-L31 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F814W Wavelength: Optional_Parameters: CR-SPLIT=NO,ATD-GAIN=15 Number_of_Iterations: 1 Time_Per_Exposure: 200 S Special_Requirements: SAME POS AS 10 NO SPLIT PAR 42 WITH 30-41 Comments: Exposure_Number: 40 Target_Name: SMC-L31 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F814W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 1200 S Special_Requirements: SAME POS AS 10 NO SPLIT Comments: Exposure_Number: 41 Target_Name: SMC-L31 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F814W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 1300 S Special_Requirements: SAME POS AS 10 NO SPLIT Comments: Exposure_Number: 42 Target_Name: SMC-L31 Config: NIC2 Opmode: MULTIACCUM Aperture: NIC2-FIX Sp_Element: F160W Wavelength: Optional_Parameters: SAMP-SEQ=SPARS256,NSAMP=12 Number_of_Iterations: 1 Time_Per_Exposure: DEF Special_Requirements: Comments: Exposure_Number: 45 Target_Name: SMC-L31 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F814W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 1300 S Special_Requirements: SAME POS AS 10 NO SPLIT PAR 47 WITH 45-46 Comments: Exposure_Number: 46 Target_Name: SMC-L31 Config: WFPC2 Opmode: IMAGE Aperture: PC1-FIX Sp_Element: F814W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 1600 S Special_Requirements: SAME POS AS 10 NO SPLIT Comments: Exposure_Number: 47 Target_Name: SMC-L31 Config: NIC2 Opmode: MULTIACCUM Aperture: NIC2-FIX Sp_Element: F160W Wavelength: Optional_Parameters: SAMP-SEQ=SPARS256,NSAMP=12 Number_of_Iterations: 1 Time_Per_Exposure: DEF Special_Requirements: Comments: Data_Distribution ! 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