! Proposal 6756, submission 1 ! PI: David Bennett ! Received Thu Feb 8 16:42:40 EST 1996 ! From: bennett@igpp.llnl.gov ! +====================+ ! | PED OUTPUT PRODUCT | ! +====================+ ! ! /tmp_mnt/home/bennett/hst/cycle6_phase2/6756.prop ! Generated by PREPROCESSOR, version 6.0e ! Date: Tue Feb 6 15:01:29 PST 1996 Proposal_Information Title: Measuring Proper Motions of Galactic Microlenses Proposal_Category: GO Scientific_Category: STELLAR POPULATIONS Cycle: 6 Investigators PI_Name: David Bennett PI_Institution: U. of Notre Dame CoI_Name: Matt Lehner CoI_Institution: U.C. San Diego Contact: N CoI_Name: Stuart Marshall CoI_Institution: U.C. Santa Barbara Contact: N CoI_Name: Bruce Peterson CoI_Institution: Mt. Stromlo and Siding Spring Observatories Contact: N CoI_Name: Mark Pratt CoI_Institution: U.C. Santa Barbara Contact: N CoI_Name: Peter Quinn CoI_Institution: European Southern Observatory Contact: N CoI_Name: Alex Rodgers CoI_Institution: Mt. Stromlo and Siding Spring Observatories Contact: N CoI_Name: Chris Stubbs CoI_Institution: University of Washington Contact: N CoI_Name: Doug Welch CoI_Institution: McMaster University Contact: N CoI_Name: Kem Cook CoI_Institution: Lawrence Livermore National Laboratory Contact: N CoI_Name: Will Sutherland CoI_Institution: Oxford Contact: N CoI_Name: Ken Freeman CoI_Institution: Mt. Stromlo and Siding Spring Observatories Contact: N CoI_Name: Charles Alcock CoI_Institution: Lawrence Livermore National Laboratory Contact: N CoI_Name: Robyn Allsman CoI_Institution: Australian National University Contact: N CoI_Name: David Alves CoI_Institution: U.C., Davis Contact: N CoI_Name: Tim Axelrod CoI_Institution: Mt. Stromlo and Siding Spring Observatories Contact: N CoI_Name: Bob Becker CoI_Institution: U.C., Davis Contact: N CoI_Name: Kim Griest CoI_Institution: U.C. San Diego Contact: N CoI_Name: Jerry Guern CoI_Institution: U.C. San Diego Contact: N Abstract: Gravitational microlensing surveys have revealed an excess of lensing events over theoretical predictions toward both the Large Magellanic Cloud and the Galactic bulge. Only a small fraction of the LMC lensing events can be explained by known stellar populations in the Milky Way and LMC, suggesting that the bulk of the lenses belong to a new population of dark compact objects which contribute a significant fraction of the Galactic halo mass. Toward the Galactic bulge, most lenses are expected to be luminous stars in the Galactic bulge or disk, but the detected lensing rate is much higher than predicted. We propose to obtain high resolution images of 10 fields around some of our recently discovered gravitational microlensing events toward the bulge. These will be the first epoch images for comparison with later images to resolve the proper motion of the lensing objects which are luminous. We will observe 10 lens systems in the I band for one orbit per system. This will allow the measurement of proper motions for a large number of bulge lenses yielding a complete solution of the mass, distance, and velocity of the lenses. Questions Observing_Description: We propose to image 10 fields in the Galactic bulge. We will collect F814W (I band) images as first epoch data to search for proper motion of (potentially) luminous lensing objects as faint as I = 25.5. All observations will have the target placed on the PC for maximum spacial resolution. They will also be dithered to increase the spacial resolution. Also, all exposures will be taken with clocks=YES to avoid bleeding problems and to reduce overhead time. All exposures will use a gain of 7 electrons per ADU to minimize digitization noise. The length of the exposures is limited by the requirement that the lensed star and its close neighbors not be saturated, and the exposures will be dithered to improve the spacial resolution. For 9 or the targets, we will take 6 F814W I band of 260 seconds each which just fill a single orbit. For the brightest source, STAR-1803-2942, which underwent a binary lensing event with a significant color shift due to blending, the F814W I band exposures will be 4* 160 seconds. Because of the detected chromaticity and blending in this event, we will also take two 400 second F555W V band exposures of this object in order to determine how much, if any, of the observed flux is coming from the lens. Real_Time_Justification: Calibration_Justification: Additional_Comments: Because these observations are first epoch proper motion images it is highly desirable that they be scheduled as early as possible. The F555W V band exposures of star STAR-1803-2942 were included in the part (10 orbits) of the phase 1 proposal that was accepted, but the TAC also stated that only I band exposures should be taken. We believe that the resolution of these conflicting instructions from the TAC is clear: they clearly meant to exclude the deep V band images that were proposed in order to study the bulge luminosity function. (These added 2 more orbits to the bulge observations which were rejected by the TAC.) Forbiding the shallower V band images of the binary lens where the color information has already been demonstrated be important makes no scientific sence. Fixed_Targets Target_Number: 1 Target_Name: STAR-1800-2827 Alternate_Names: MACHO-108-C Description: STAR Position: RA=18H 00M 01.3S +/- 0.2S,DEC=-28D 27' 41.0" +/- 2" Equinox: J2000 RV_or_Z: RA_PM: 0.0 Dec_PM: 0.0 Epoch: J2000 Annual_Parallax: 0.0 Flux: V = 19.7+/-0.3, V-R = 1.1+/-0.2 Comments: Target_Number: 2 Target_Name: STAR-1803-3009 Alternate_Names: MACHO-119-C Description: STAR Position: RA=18H 03M 03.0S +/- 0.2S,DEC=-30D 09' 56.5" +/- 2" Equinox: J2000 RV_or_Z: RA_PM: 0.0 Dec_PM: 0.0 Epoch: J2000 Annual_Parallax: 0.0 Flux: V = 19.5+/-0.3 V-R = 0.7+/-0.2 Comments: Target_Number: 3 Target_Name: STAR-1804-3005 Alternate_Names: MACHO-119-D Description: STAR Position: RA=18H 04M 24.8S +/- 0.2S,DEC=-30D 05' 58.9" +/- 2" Equinox: J2000 RV_or_Z: RA_PM: 0.0 Dec_PM: 0.0 Epoch: J2000 Annual_Parallax: 0.0 Flux: V = 19.7+/-0.3 V-R = 1.1+/-0.2 Comments: Target_Number: 4 Target_Name: STAR-1807-2939 Alternate_Names: MACHO-120-A Description: STAR Position: RA=18H 07M 26.4S +/- 0.2S,DEC=-29D 39' 34.0" +/- 2" Equinox: J2000 RV_or_Z: RA_PM: 0.0 Dec_PM: 0.0 Epoch: J2000 Annual_Parallax: 0.0 Flux: V = 20.8+/-0.3 V-R = 0.7+/-0.2 Comments: Target_Number: 5 Target_Name: STAR-1807-3109 Alternate_Names: MACHO-124-B Description: STAR Position: RA=18H 07M 51.9S +/- 0.2S,DEC=-31D 09' 19.8" +/- 2" Equinox: J2000 RV_or_Z: RA_PM: 0.0 Dec_PM: 0.0 Epoch: J2000 Annual_Parallax: 0.0 Flux: V = 20.0+/-0.3 V-R = 0.7+/-0.2 Comments: Target_Number: 6 Target_Name: STAR-1813-2631 Alternate_Names: MACHO-167-A Description: STAR Position: RA=18H 13M 32.15S +/- 0.2S,DEC=-26D 31' 10.3" +/- 2" Equinox: J2000 RV_or_Z: RA_PM: 0.0 Dec_PM: 0.0 Epoch: J2000 Annual_Parallax: 0.0 Flux: V = 20.1+/-0.3 V-R = 0.9+/-0.2 Comments: Target_Number: 7 Target_Name: STAR-1807-2731 Alternate_Names: MACHO-101-C Description: STAR Position: RA=18H 07M 32.65S +/- 0.2S,DEC=-27D 31' 35.6" +/- 2" Equinox: J2000 RV_or_Z: RA_PM: 0.0 Dec_PM: 0.0 Epoch: J2000 Annual_Parallax: 0.0 Flux: V = 19.5+/-0.3 V-R = 0.8+/-0.2 Comments: Target_Number: 8 Target_Name: STAR-1804-3012 Alternate_Names: MACHO-Alert-95-11 Description: STAR Position: RA=18H 04M 37.2S +/- 0.2S,DEC=-30D 12' 11.0" +/- 2" Equinox: J2000 RV_or_Z: RA_PM: 0.0 Dec_PM: 0.0 Epoch: J2000 Annual_Parallax: 0.0 Flux: V = 19.9+/-0.3 V-R = 1.0+/-0.2 Comments: Target_Number: 9 Target_Name: STAR-1806-2753 Alternate_Names: MACHO-Alert-96-BLG-17 Description: STAR Position: RA=18H 06M 09.1S +/- 0.2S,DEC=-27D 53' 39.0" +/- 2" Equinox: J2000 RV_or_Z: RA_PM: 0.0 Dec_PM: 0.0 Epoch: J2000 Annual_Parallax: 0.0 Flux: V = 19.9+/-0.3 V-R = 0.6+/-0.2 Comments: Target_Number: 10 Target_Name: STAR-1803-2942 Alternate_Names: MACHO-119-A Description: STAR Position: RA=18H 03M 35.8S +/- 0.2S,DEC=-29D 42' 01.0" +/- 2" Equinox: J2000 RV_or_Z: RA_PM: 0.0 Dec_PM: 0.0 Epoch: J2000 Annual_Parallax: 0.0 Flux: V = 19.0+/-0.3 V-R = 0.9+/-0.2 Comments: Solar_System_Targets Generic_Targets Scan_Data Visits Visit_Number: 01 Visit_Requirements: ORIENT 93d to 93d On_Hold_Comments: Visit_Comments: Exposure_Number: 1 Target_Name: STAR-1800-2827 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F814W Wavelength: Optional_Parameters: CLOCKS=YES,DITHER-TYPE=LINE,DITHER-LINE-STEPS=6,DITHER-LINE-SPACING=0.4714 Number_of_Iterations: 1 Time_Per_Exposure: 260s Special_Requirements: Comments: Visit_Number: 02 Visit_Requirements: ORIENT 93d to 93d On_Hold_Comments: Visit_Comments: Exposure_Number: 1 Target_Name: STAR-1803-3009 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F814W Wavelength: Optional_Parameters: CLOCKS=YES,DITHER-TYPE=LINE,DITHER-LINE-STEPS=6,DITHER-LINE-SPACING=0.4714 Number_of_Iterations: 1 Time_Per_Exposure: 260s Special_Requirements: Comments: Visit_Number: 03 Visit_Requirements: ORIENT 93d to 93d On_Hold_Comments: Visit_Comments: Exposure_Number: 1 Target_Name: STAR-1804-3005 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F814W Wavelength: Optional_Parameters: CLOCKS=YES,DITHER-TYPE=LINE,DITHER-LINE-STEPS=6,DITHER-LINE-SPACING=0.4714 Number_of_Iterations: 1 Time_Per_Exposure: 260s Special_Requirements: Comments: Visit_Number: 04 Visit_Requirements: ORIENT 89d to 89d On_Hold_Comments: Visit_Comments: Exposure_Number: 1 Target_Name: STAR-1807-2939 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F814W Wavelength: Optional_Parameters: CLOCKS=YES,DITHER-TYPE=LINE,DITHER-LINE-STEPS=6,DITHER-LINE-SPACING=0.4714 Number_of_Iterations: 1 Time_Per_Exposure: 260s Special_Requirements: Comments: Visit_Number: 05 Visit_Requirements: ORIENT 104d to 104d On_Hold_Comments: Visit_Comments: Exposure_Number: 1 Target_Name: STAR-1807-3109 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F814W Wavelength: Optional_Parameters: CLOCKS=YES,DITHER-TYPE=LINE,DITHER-LINE-STEPS=6,DITHER-LINE-SPACING=0.4714 Number_of_Iterations: 1 Time_Per_Exposure: 260s Special_Requirements: Comments: Visit_Number: 06 Visit_Requirements: ORIENT 90d to 90d On_Hold_Comments: Visit_Comments: Exposure_Number: 1 Target_Name: STAR-1813-2631 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F814W Wavelength: Optional_Parameters: CLOCKS=YES,DITHER-TYPE=LINE,DITHER-LINE-STEPS=6,DITHER-LINE-SPACING=0.4714 Number_of_Iterations: 1 Time_Per_Exposure: 260s Special_Requirements: Comments: Visit_Number: 07 Visit_Requirements: ORIENT 7d to 7d On_Hold_Comments: Visit_Comments: Exposure_Number: 1 Target_Name: STAR-1807-2731 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F814W Wavelength: Optional_Parameters: CLOCKS=YES,DITHER-TYPE=LINE,DITHER-LINE-STEPS=6,DITHER-LINE-SPACING=0.4714 Number_of_Iterations: 1 Time_Per_Exposure: 260s Special_Requirements: Comments: Visit_Number: 08 Visit_Requirements: ORIENT 84d to 84d On_Hold_Comments: Visit_Comments: Exposure_Number: 1 Target_Name: STAR-1804-3012 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F814W Wavelength: Optional_Parameters: CLOCKS=YES,DITHER-TYPE=LINE,DITHER-LINE-STEPS=6,DITHER-LINE-SPACING=0.4714 Number_of_Iterations: 1 Time_Per_Exposure: 260s Special_Requirements: Comments: Visit_Number: 09 Visit_Requirements: ORIENT 90d to 90d On_Hold_Comments: Visit_Comments: Exposure_Number: 1 Target_Name: STAR-1806-2753 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F814W Wavelength: Optional_Parameters: CLOCKS=YES,DITHER-TYPE=LINE,DITHER-LINE-STEPS=6,DITHER-LINE-SPACING=0.4714 Number_of_Iterations: 1 Time_Per_Exposure: 260s Special_Requirements: Comments: Visit_Number: 10 Visit_Requirements: ORIENT 80d to 80d On_Hold_Comments: Visit_Comments: Exposure_Number: 1 Target_Name: STAR-1803-2942 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F814W Wavelength: Optional_Parameters: CLOCKS=YES,DITHER-TYPE=BOX Number_of_Iterations: 1 Time_Per_Exposure: 160S Special_Requirements: Comments: Exposure_Number: 2 Target_Name: STAR-1803-2942 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F555W Wavelength: Optional_Parameters: CLOCKS=YES,DITHER-TYPE=LINE,DITHER-LINE-STEPS=2,DITHER-LINE-SPACING=0.3535 Number_of_Iterations: 1 Time_Per_Exposure: 400S Special_Requirements: Comments: Data_Distribution ! Defaults indicated; change if desired Medium: 8MM Blocking_Factor: 10 Ship_To: David Bennett Physics Department Nieuwland Science Hall University of Notre Dame Notre Dame, IN 46556 Ship_Via: UPS Recipient_Email: ! Let us know what you think of this template and software! ! Please send a list of your likes and dislikes to your Program Coordinator