0 Assigned ID: 247 ----- Attempting Submission 1 (Thu Apr 07 17:41:17 GMT 2016) ----- HST Phase I Proposal 247 (NO_MPs.apt) successfully submitted. Receipt: # 247-1 0 ----- Attempting Submission 1 (Thu Jul 14 12:33:42 GMT 2016) ----- The origin of the multiple populations (MPs) seen in nearly all globular clusters (GCs) is still unknown, with all suggested scenarios having serious shortcomings. While large ground based spectroscopic samples and space based imaging surveys have provided a wealth of data and shown how complex the situation is, they have not been able to pinpoint the GC property that controls whether MPs are present. GC mass is traditionally the assumed dominant factor, but recent results suggest a more complex scenario where the mass cannot be the only parameter. Hence, in order to make progress we need to understand which objects (if any) do not host MPs, and ultimately which property is responsible for the onset of MPs. Here we target two GCs that have been suggested to not host MPs (based on ground based imaging or abundance analyses of small stellar samples), Ruprecht 106 and IC 4499. These two clusters are "typical" in terms of age and mass of GCs, which would make the lack of MPs all the more surprising, if confirmed. If so, more exotic properties may have played a role (i.e., the type of galaxy where the clusters formed). We request 8 exposures of ~1100sec in F275W, 4 exposures of 650sec in F336W and 4 exposures of ~100sec in F438W for a total of 4 orbits to sample the central regions of the Galactic globular cluster IC4499. In order to fully exploit the resolution and photometric accuracy of HST we applied properly defined offsets and post-flash operation to limit the charge-transfer efficiency (CTE) losses. 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. J2000 J2000 WFC3/UVIS Imaging No No F275W WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F275W WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F438W 1468325976320 /Users/ema/LAVORO/HST_24/OP-cache/NO_MPs_ph2-v01.xml The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 14723 :visit-id "01" :proposal-version -1 :trans-version "20160601" :date "12-Jul-2016 14:19:34.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 4619952 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14723 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14723 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3271 :al-overhead-at-end 123 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3604 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14723 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3382 :al-overhead-at-end 123 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3604 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14723 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3382 :al-overhead-at-end 123 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3604 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14723 :visit-id "01" :orbit-number 4 :pcs-time 222 :si-vis-utilization 3382 :al-overhead-at-end 123 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3604 :pcs-gap 0 ) true 4 0