We postponed the 1-orbit visit05, as to be taken >1 year AFTER the already collected visits:04,06,07,08,09. This small change (approved by Claus Leitherer on 14 may 2010) will enable great proper motions, which significantly will improve our science, as they will decontaminate our color-magnitude diagram from most of the bulge's star in foreground and background of NGC6441. ----- Attempting Submission 1 (Tue Jul 01 15:59:41 GMT 2008) ----- ----- Attempting Submission 2 (Mon Jul 14 10:57:06 GMT 2008) ----- ----- Attempting Submission 3 (Mon Jul 14 15:52:38 GMT 2008) ----- ----- Attempting Submission 5 (Mon Jul 14 17:56:54 GMT 2008) ----- Phase II Proposal 11739 (11739.apt) successfully submitted. ----- Attempting Submission 6 (Mon Jul 14 18:07:17 GMT 2008) ----- ----- Attempting Submission 7 (Mon Jun 29 15:28:14 GMT 2009) ----- ----- Attempting Submission 8 (Mon Jun 29 19:08:36 GMT 2009) ----- ----- Attempting Submission 9 (Fri May 14 15:38:07 GMT 2010) ----- We postponed visit 05. Assigned ID: 321 ----- Attempting Submission 1 (Fri Mar 07 12:09:18 GMT 2008) ----- Over the last few years HST observations have resulted in one of the most exciting and unexpected developments in stellar population studies: the discovery of multiple generations of stars in several globular clusters. The finding of multiple main sequences in the massive clusters NGC 2808 and Omega Centauri, and multiple subgiant branches in NGC 1851, M54, and NGC 6388 has challenged the long-held paradigm that globular clusters are simple stellar populations. Even more surprising, given the spectroscopic and photometric constraints, the only viable explanation for the main sequence splitting appears to be Helium enrichment, up to an astonishingly high Y=0.4. The conditions under which certain globulars experience the formation of multiple stellar generations remain mysterious, and even more so the helium-enrichment phenomenon. Such an enrichment has important implications for chemical-enrichment, star-formation, and stellar-evolution scenarios, in star clusters and likely elsewhere. To properly constrain the multiple main sequence phenomenon, it is important to determine its extent among GCs: is it limited to Omega Cen and NGC2808, or is it more common? We propose deep WFC3 optical/IR imaging of NGC 6388 and 6441, the two globular clusters that are most likely to host multiple, helium-enriched populations. Our simulations of WFC3 performance suggest that we will be able to detect even the main sequence splittings caused by small He differences (Delta Y <0.03).

UVIS and NIR WFC3 observations of two Bulge clusters. RESOLVED STELLAR POPULATIONS 12 false 0.0 0.0 false false false false false false SUPPORTED STELLAR CLUSTER GLOBULAR CLUSTER This object was generated by the targetselector and retrieved from the NED database. J2000 17 36 17.4000 -44 44 8.00 J2000 STELLAR CLUSTER GLOBULAR CLUSTER This object was generated by the targetselector and retrieved from the NED database. J2000 17 50 12.8000 -37 03 4.00 J2000 WFC3/UVIS Imaging No No F390W WFC3/IR Imaging No No F160W ACS/WFC Imaging No No F475W ACS/WFC Imaging No No F814W WFC3/UVIS Imaging No No F390W WFC3/IR Imaging No No F160W ACS/WFC Imaging No No F475W ACS/WFC Imaging No No F814W Same orient constraint links visits (01 02 03) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1246302114809 (Tic-Visit :proposal-id 11739 :visit-id "01" :proposal-version -1 :trans-version "20090130" :date "29-Jun-2009 15:01:54.0" :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 2003136 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11739 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11739 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2991 :al-overhead-at-end 82 :internal-dur-at-end 1019 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3351 :pcs-gap 0 ) true 1 0 Same orient constraint links visits (01 02 03) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1246302115851 (Tic-Visit :proposal-id 11739 :visit-id "02" :proposal-version -1 :trans-version "20090130" :date "29-Jun-2009 15:01:55.0" :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 2003136 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11739 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11739 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2989 :al-overhead-at-end 82 :internal-dur-at-end 1019 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3351 :pcs-gap 0 ) true 1 0 Same orient constraint links visits (01 02 03) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1246302117748 (Tic-Visit :proposal-id 11739 :visit-id "03" :proposal-version -1 :trans-version "20090130" :date "29-Jun-2009 15:01:57.0" :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 2094800 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11739 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11739 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2986 :al-overhead-at-end 0 :internal-dur-at-end 998 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3351 :pcs-gap 0 ) true 1 0 Same orient constraint links visits (04 08 09) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1246302119505 1273336308000 300.0 (Tic-Visit :proposal-id 11739 :visit-id "04" :proposal-version -1 :trans-version "20090130" :date "29-Jun-2009 15:01:59.0" :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 2003136 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11739 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11739 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2975 :al-overhead-at-end 105 :internal-dur-at-end 1019 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3310 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1246302120513 (Tic-Visit :proposal-id 11739 :visit-id "05" :proposal-version -1 :trans-version "20090130" :date "29-Jun-2009 15:02:00.0" :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 2003136 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11739 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11739 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2977 :al-overhead-at-end 105 :internal-dur-at-end 1019 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3310 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1246302121532 1273244206000 296.0 (Tic-Visit :proposal-id 11739 :visit-id "06" :proposal-version -1 :trans-version "20090130" :date "29-Jun-2009 15:02:01.0" :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 2003136 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11739 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11739 :visit-id "06" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2975 :al-overhead-at-end 105 :internal-dur-at-end 1019 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3310 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1246302122620 1272996582000 296.0 (Tic-Visit :proposal-id 11739 :visit-id "07" :proposal-version -1 :trans-version "20090130" :date "29-Jun-2009 15:02:02.0" :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 2003136 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11739 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11739 :visit-id "07" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2976 :al-overhead-at-end 105 :internal-dur-at-end 1019 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3310 :pcs-gap 0 ) true 1 0 Same orient constraint links visits (04 08 09) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1246302124474 1273255907000 300.0 (Tic-Visit :proposal-id 11739 :visit-id "08" :proposal-version -1 :trans-version "20090130" :date "29-Jun-2009 15:02:04.0" :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 2094800 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11739 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11739 :visit-id "08" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2952 :al-overhead-at-end 0 :internal-dur-at-end 998 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3310 :pcs-gap 0 ) true 1 0 Same orient constraint links visits (04 08 09) The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. 1246302126264 1273249963000 300.0 (Tic-Visit :proposal-id 11739 :visit-id "09" :proposal-version -1 :trans-version "20090130" :date "29-Jun-2009 15:02:05.0" :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 2094800 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11739 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11739 :visit-id "09" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2962 :al-overhead-at-end 0 :internal-dur-at-end 998 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3310 :pcs-gap 0 ) true 1 0