0 Assigned ID: 846 ----- Attempting Submission 1 (Fri Apr 08 21:18:43 GMT 2016) ----- 0 ----- Attempting Submission 1 (Mon Jul 18 16:09:03 GMT 2016) ----- Hunting for Brown Dwarfs in Globular Clusters: Second Epoch Deep IR observations of the Globular Clusters M4 We propose to obtain a second epoch of deep WFC3/F110W imaging of the globular cluster M4 to confirm (or rule out) the first brown dwarfs (BDs) detected in this cluster. In a first epoch of deep WFC3 IR imaging of M4, four good BD candidates were identified. We will use a second epoch to test whether the BD candidates share the proper motion of the cluster population or not, thereby confirming (or ruling out) these sources as genuine cluster members. Confirming these sources as cluster BDs is crucial if we want to fill the observational plane with old and metal-poor benchmark sources that are much needed if we are to test and calibrate models about BD atmospheres, BD formation and evolution. The observations will be obtained using a dither pattern otpimized to best sample the PSF, and to compensate for detector deficits like hot/cold/dead pixels and the IR blobs, which will improve image quality and resolution. We use POS TARG to implement the dither steps. The observations will be carried out in two visits consisting of 1 orbit each. Both orbits will be done with a NSAMP14 SPARS50 and the four point dither pattern. Stellar Populations 12 false false false false false false SUPPORTED STELLAR CLUSTER GLOBULAR CLUSTER This object was generated by the targetselector and retrieved from the SIMBAD database, the coordinates were updated to match the coordinates of the first epoch WFC3 F110W observations (GO-12602). J2000 J2000 STELLAR CLUSTER GLOBULAR CLUSTER This object was generated by the targetselector and retrieved from the SIMBAD database, the coordinates were updated to match the coordinates of the first epoch WFC3 F110W observations (GO-12602) and shifted slightly. J2000 J2000 WFC3/IR Imaging No No F110W /vol/aibn30/data1/adieball/Text/proposals/hst/Cycle24/phaseII/OP-cache/M4e2-v01.xml The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 14725 :visit-id "01" :proposal-version -1 :trans-version "20160601" :date "15-Jul-2016 16:42:37.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1044528 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14725 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14725 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2864 :al-overhead-at-end 0 :internal-dur-at-end 519 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) true 1 0 /vol/aibn30/data1/adieball/Text/proposals/hst/Cycle24/phaseII/OP-cache/M4e2-v02.xml The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 14725 :visit-id "02" :proposal-version -1 :trans-version "20160601" :date "18-Jul-2016 17:26:15.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1044528 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14725 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14725 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2855 :al-overhead-at-end 0 :internal-dur-at-end 519 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) true 1 0