Assigned ID: 256 ----- Attempting Submission 1 (Fri Feb 24 00:27:12 GMT 2012) ----- ----- Attempting Submission 1 (Fri Jul 06 09:16:15 GMT 2012) ----- HST Phase II Proposal 13010 (lmc_phaseII.apt) successfully submitted. ----- Attempting Submission 2 (Wed Sep 26 02:26:30 GMT 2012) ----- ----- Attempting Submission 3 (Wed Oct 03 00:02:01 GMT 2012) ----- A precise calibration of the zero point of the cosmic distance scale from late-type eclipsing binaries in the LMC Eclipsing binaries represent one of the most accurate distance measurement tools available. This is especially true for systems composed of late-type stars, for which a reliable surface brightness-color relationship is now at hand. We have discovered 31 G-type eclipsing binary systems in the LMC wading through 100,000 eclipsing systems catalogued by the OGLE project. We have also uncovered two rare and unique systems in which one of the two components is a Cepheid variable. We have collected near-IR photometry and high-resolution spectroscopy from the ground for all the new systems in order to derive orbital and stellar parameters, and distances. Recently, we published the results for the first of our systems, obtaining a distance modulus to the LMC of 18.50 +/- 0.06. We also derived the dynamical mass of a Cepheid variable contained in one of our binaries with an unprecedented accuracy of 1%. We are now in a position to measure the distance to the LMC, the main anchor point of the extragalactic distance scale, with an accuracy of 1%, using the large number of binaries at our disposal. However, our photometric solutions for the eclipsing binaries assume that there is no blending with nearby companions. Therefore, in order to make full use of the very special stellar systems that we have discovered and obtain a very accurate distance to the LMC, we request multi-band, high spatial resolution WFC3 imaging of 11 of the best systems to check for the presence of companions and characterize their spectral energy distribution. The program obtains images in 4 filters of single stellar targets (eclipsing binaries) in the LMC. The 512 pixel subarray is used in order to reduce readout times and observe two targets in single-orbit visits (the targets are separated by less than 1 degree). One of the visits observes a single target. A 2-point dithering is used. For the longer exposures (with filters F336W, F438W) we include a CR-SPLIT requirement to better handle cosmic ray events. RESOLVED STELLAR POPULATIONS 12 false 0.0 0.0 false false false false SUPPORTED EXT-STAR CEPHEID J2000 J2000 Cepheid in binary EXT-STAR CEPHEID J2000 J2000 Cepheid in binary EXT-STAR REGULAR VARIABLE 2MASSJ05140595-6915568 J2000 J2000 EXT-STAR REGULAR VARIABLE MACHO47.1884.17 J2000 J2000 EXT-STAR REGULAR VARIABLE 2MASSJ04555149-6913479 J2000 J2000 EXT-STAR REGULAR VARIABLE 2MASSJ05043288-6920509 J2000 J2000 EXT-STAR REGULAR VARIABLE 2MASSJ05101965-6858120 J2000 J2000 EXT-STAR REGULAR VARIABLE 2MASSJ05195369-6917204 J2000 EXT-STAR REGULAR VARIABLE 2MASSJ05140190-6841184 J2000 J2000 EXT-STAR REGULAR VARIABLE 2MASSJ05252555-6933044 J2000 J2000 EXT-STAR REGULAR VARIABLE 2MASSJ05325304-6859123 J2000 J2000 WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W POS-TARG DITHER 0.145 LINE false false 2 46.84 WFC3-UVIS-DITHER-LINE 1 false The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. /private/var/folders/28/28-HOEOVFyyfcm5fXIDD7E+++TI/-Tmp-/OPVisit4014043560841056147.xml (Tic-Visit :proposal-id 13010 :visit-id "01" :proposal-version -1 :trans-version "20120604" :date "02-Oct-2012 13:55:54.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 427792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13010 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13010 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2650 :al-overhead-at-end 76 :internal-dur-at-end 504 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3073 :pcs-gap 0 ) true 1 0 /private/var/folders/28/28-HOEOVFyyfcm5fXIDD7E+++TI/-Tmp-/OPVisit724963647206934438.xml The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13010 :visit-id "02" :proposal-version -1 :trans-version "20120604" :date "02-Oct-2012 13:55:57.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 118992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13010 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Obset :proposal-id 13010 :visit-id "02" :obset-id "A2" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13010 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2665 :al-overhead-at-end 40 :internal-dur-at-end 167 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3057 :pcs-gap 0 ) true 1 0 /private/var/folders/28/28-HOEOVFyyfcm5fXIDD7E+++TI/-Tmp-/OPVisit7614361688050237061.xml The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13010 :visit-id "03" :proposal-version -1 :trans-version "20120604" :date "02-Oct-2012 13:55:59.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 118992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13010 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Obset :proposal-id 13010 :visit-id "03" :obset-id "A3" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13010 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2672 :al-overhead-at-end 40 :internal-dur-at-end 167 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3057 :pcs-gap 0 ) true 1 0 /private/var/folders/28/28-HOEOVFyyfcm5fXIDD7E+++TI/-Tmp-/OPVisit1405124291146310462.xml The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. 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(Tic-Visit :proposal-id 13010 :visit-id "06" :proposal-version -1 :trans-version "20120604" :date "02-Oct-2012 13:56:07.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 118992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13010 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Obset :proposal-id 13010 :visit-id "06" :obset-id "A6" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13010 :visit-id "06" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2638 :al-overhead-at-end 40 :internal-dur-at-end 167 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3057 :pcs-gap 0 ) true 1 0