! Proposal 6569, submission 1 ! PI: John MacKenty ! Received Sun Apr 28 13:36:22 EDT 1996 ! From: mackenty@tib_srvr ! +====================+ ! | PED OUTPUT PRODUCT | ! +====================+ ! ! /qso/data11/6569/6569.prop ! Generated by PREPROCESSOR, version 6.0e ! Date: Sat Apr 27 17:57:56 EDT 1996 Proposal_Information Title: The Physics of Nearby Blue Irregular Starbursts Proposal_Category: GO Scientific_Category: STELLAR POPULATIONS Cycle: 6 Investigators PI_Name: John MacKenty PI_Institution: Space Telescope Science Institute CoI_Name: Colin Norman CoI_Institution: The Johns Hopkins University Contact: CoI_Name: Richard Burg CoI_Institution: The Johns Hopkins University Contact: CoI_Name: Richard Griffiths CoI_Institution: The Johns Hopkins University Contact: CoI_Name: Rosemary Wyse CoI_Institution: The Johns Hopkins University Contact: Abstract: We propose to exploit the resolution of the WFPC2 to obtain U, V, R, and I and narrow band H Alpha and O III images of an optimally-selected sample of three local dwarf starburst galaxies in order to understand the mechanism of star formation in these systems. These objects have O III equivalent widths greater than 50Angstrom. These dwarf galaxies are close enough that massive stars can be resolved by HST and are extremely important local laboratories for the study of star formation. This type of low luminosity irregular galaxy has been shown to evolve significantly from redshifts of 0.5 - 1 to the current epoch (Glazebrook et al. 1995, Driver et al. 1995, Lilly et al. 1995) in contrast to the more luminous population of early type systems that do not seem to evolve. The understanding of the evolutionary processes in these systems is unclear but interactions, merging, and general starburst activity seem to play a major role. Our detailed study of the sample proposed here may be of significant help in understanding the physics of these objects and there evolution. Many fundamental questions about the essential physical nature of these and larger starburst systems remain unanswered including: (1) is the mass function of a burst restricted to the high mass end; (2) does it depend on metallicity; (3) what physical mechanisms actually trigger the burst. Our HST data will have sufficient spatial resolution to resolve isolated individual high mass main sequence stars and super giants and to distinguish clusters similar to R136A. Questions Observing_Description: We propose to observe three blue dwarf galaxies with WFPC2 and the appropriate wide filter bandpasses for U (F336W), V (F555W), R (F702W), and I (F814W). Images in H Alpha (F656N or F658N) and O III (F502N) will also be obtained. We will request CR-SPLIT images with a ratio of 3:2 to improve the dynamic range of the images and to permit us to reject cosmic rays in the data analysis. Since the star formation is occurring across essentially the entire galaxy for the members of our sample, we request that the PC1 detector be pointed at the centers of these galaxies. Our sample represents the closest galaxies meeting our selection criteria which span a broad range of luminosities as shown below. Name m_B B(0) v_H UGC 685 14.5 -12.88 113 UGC 5456 13.5 -14.31 513 NGC 4214 10.4 -16.6 294 The broad band observations are primarily intended to permit the determination of the magnitudes and colors of the brightest stars which currently (or recently) provide the ionizing flux in the galaxy. These are the B and O main sequence stars and the supergiants. The following exposure times are derived for a distance modulus of 27.6 and are based on the formulae and values given in the WFPC2 Instrument Handbook. A simple calculation indicates that in a total of two orbits we should achieve a S/N of 20 or better for main sequence stars hotter than B0V. These exposures provide similar S/N for supergiants hotter than K0 I except in the U filter where we will only reach F0 I for a signal to noise better than 20. Specifically, for a M_v=-6 star signal levels of 7.3, 16.7, 13.6, and 5.0 e^-/s are expected in F336W, F555W, F702W, and F814W, respectively. The most distant galaxy in our sample (NGC 3432) should have corresponding S/N ratios better than 5. The H Alpha and O III exposure times are more difficult to constrain due to the large range in surface brightnesses in the line emission regions. We propose to obtain a 30 to 40 minutes of integration in each filter (CR-SPLIT) to explore a range of surface brightnesses. Real_Time_Justification: Calibration_Justification: Additional_Comments: Fixed_Targets Target_Number: 1 Target_Name: NGC4214 Alternate_Names: UGC7278 Description: GALAXY,MAGELLANIC IRREGULAR, Position: RA=12H 15M 39.3S +/- 1",DEC=36D 19' 38" +/- 1" Equinox: J2000 RV_or_Z: V = 294 RA_PM: 0.0 Dec_PM: 0.0 Epoch: Annual_Parallax: 0.0 Flux: V = 10.4+/-0.2 Comments: Target_Number: 2 Target_Name: UGC685 Alternate_Names: Description: GALAXY,DWARF COMPACT/HII GALAXY, Position: RA=01H 07M 23S +/- 2",DEC=16D 41' 03" +/- 2" Equinox: J2000 RV_or_Z: V = 113 RA_PM: 0.0 Dec_PM: 0.0 Epoch: Annual_Parallax: 0.0 Flux: V = 14.5+/-0.2 Comments: Target_Number: 3 Target_Name: UGC5456 Alternate_Names: Description: GALAXY,DWARF COMPACT/HII GALAXY, Position: RA=10H 07M 19.7S +/- 2",DEC=10D 21' 46" +/- 2" Equinox: J2000 RV_or_Z: V = 513 RA_PM: 0.0 Dec_PM: 0.0 Epoch: Annual_Parallax: 0.0 Flux: V = 13.5+/-0.2 Comments: Solar_System_Targets Generic_Targets Scan_Data Visits Visit_Number: 01 Visit_Requirements: PCS MODE FINE On_Hold_Comments: Visit_Comments: Exposure_Number: 10 Target_Name: NGC4214 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F336W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 260S Special_Requirements: Comments: Exposure_Number: 11 Target_Name: NGC4214 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F336W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 2 Time_Per_Exposure: 900S Special_Requirements: SAME POS AS 10 Comments: Exposure_Number: 20 Target_Name: NGC4214 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F555W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 100S Special_Requirements: SAME POS AS 10 Comments: Exposure_Number: 21 Target_Name: NGC4214 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F555W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 2 Time_Per_Exposure: 600S Special_Requirements: SAME POS AS 10 Comments: Exposure_Number: 30 Target_Name: NGC4214 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F702W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 2 Time_Per_Exposure: 500S Special_Requirements: SAME POS AS 10 Comments: Exposure_Number: 31 Target_Name: NGC4214 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F702W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 100S Special_Requirements: SAME POS AS 10 Comments: Exposure_Number: 40 Target_Name: NGC4214 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F814W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 100S Special_Requirements: SAME POS AS 10 Comments: Exposure_Number: 41 Target_Name: NGC4214 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F814W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 2 Time_Per_Exposure: 600S Special_Requirements: SAME POS AS 10 Comments: Exposure_Number: 50 Target_Name: NGC4214 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F502N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 700S Special_Requirements: SAME POS AS 10 Comments: Exposure_Number: 51 Target_Name: NGC4214 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F502N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: SAME POS AS 10 Comments: Exposure_Number: 60 Target_Name: NGC4214 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F656N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: SAME POS AS 10 Comments: Exposure_Number: 61 Target_Name: NGC4214 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F656N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: SAME POS AS 10 Comments: Visit_Number: 02 Visit_Requirements: ORIENT 313D TO 343D PCS MODE FINE On_Hold_Comments: Visit_Comments: Exposure_Number: 110 Target_Name: UGC5456 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F336W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 300S Special_Requirements: POS TARG -15,-15 Comments: Exposure_Number: 111 Target_Name: UGC5456 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F336W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 2 Time_Per_Exposure: 1000S Special_Requirements: SAME POS AS 110 Comments: Exposure_Number: 120 Target_Name: UGC5456 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F555W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 100S Special_Requirements: SAME POS AS 110 Comments: Exposure_Number: 121 Target_Name: UGC5456 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F555W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 2 Time_Per_Exposure: 500S Special_Requirements: SAME POS AS 110 Comments: Exposure_Number: 130 Target_Name: UGC5456 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F702W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 2 Time_Per_Exposure: 500S Special_Requirements: SAME POS AS 110 Comments: Exposure_Number: 131 Target_Name: UGC5456 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F702W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 100S Special_Requirements: SAME POS AS 110 Comments: Exposure_Number: 140 Target_Name: UGC5456 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F814W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 100S Special_Requirements: SAME POS AS 110 Comments: Exposure_Number: 141 Target_Name: UGC5456 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F814W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 2 Time_Per_Exposure: 600S Special_Requirements: SAME POS AS 110 Comments: Exposure_Number: 150 Target_Name: UGC5456 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F502N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 700S Special_Requirements: SAME POS AS 110 Comments: Exposure_Number: 151 Target_Name: UGC5456 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F502N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: SAME POS AS 110 Comments: Exposure_Number: 160 Target_Name: UGC5456 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F656N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 700S Special_Requirements: SAME POS AS 110 Comments: Exposure_Number: 161 Target_Name: UGC5456 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F656N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: SAME POS AS 110 Comments: Visit_Number: 03 Visit_Requirements: ORIENT 103D TO 123D PCS MODE FINE On_Hold_Comments: Visit_Comments: Exposure_Number: 210 Target_Name: UGC685 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F336W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 300S Special_Requirements: POS TARG -15,-15 Comments: Exposure_Number: 211 Target_Name: UGC685 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F336W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 2 Time_Per_Exposure: 1000S Special_Requirements: SAME POS AS 210 Comments: Exposure_Number: 220 Target_Name: UGC685 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F555W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 100S Special_Requirements: SAME POS AS 210 Comments: Exposure_Number: 221 Target_Name: UGC685 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F555W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 2 Time_Per_Exposure: 500S Special_Requirements: SAME POS AS 210 Comments: Exposure_Number: 230 Target_Name: UGC685 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F702W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 2 Time_Per_Exposure: 500S Special_Requirements: SAME POS AS 210 Comments: Exposure_Number: 231 Target_Name: UGC685 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F702W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 100S Special_Requirements: SAME POS AS 210 Comments: Exposure_Number: 240 Target_Name: UGC685 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F814W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 100S Special_Requirements: SAME POS AS 210 Comments: Exposure_Number: 241 Target_Name: UGC685 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F814W Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 2 Time_Per_Exposure: 600S Special_Requirements: SAME POS AS 210 Comments: Exposure_Number: 250 Target_Name: UGC685 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F502N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 700S Special_Requirements: SAME POS AS 210 Comments: Exposure_Number: 251 Target_Name: UGC685 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F502N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: SAME POS AS 210 Comments: Exposure_Number: 260 Target_Name: UGC685 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F656N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 700S Special_Requirements: SAME POS AS 210 Comments: Exposure_Number: 261 Target_Name: UGC685 Config: WFPC2 Opmode: IMAGE Aperture: WFALL-FIX Sp_Element: F656N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: SAME POS AS 210 Comments: Data_Distribution ! 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