Forgot to add ORIENT constraint for one visit in first submission. ----- Submission 1 (Thu May 12 21:49:57 GMT 2005) ----- Phase II Proposal 10595 (LMC_GCs) successfully submitted. ----- Submission 2 (Thu May 12 22:16:06 GMT 2005) ----- Assigned ID: 604 ----- Submission 1 (Sat Jan 22 00:24:53 GMT 2005) ----- Phase I Proposal 604 (LMC_GC) successfully submitted. ----- Submission 3 (Sat Jan 22 00:43:33 GMT 2005) ----- Phase I Proposal 604 (LMC_GC) successfully submitted. A Reference Database for Accurate Ages and Metallicities of Globular Clusters in the Magellanic Clouds We propose to finalize the compilation of a comprehensive database of high-quality ages and metallicities of Simple Stellar Populations (SSPs) in the Milky Way and the Magellanic Clouds. We will acquire new ACS imagery for 8 young and intermediate-age globular clusters in the Magellanic Clouds to create high-quality color-magnitude diagrams (CMDs) to enable accurate measurements of their ages and metallicities. In concert with a similar analysis of CMD data already available in the HST archive for 8 more such GCs, the resulting database will provide a well-sampled coverage of the full range of ages and metallicities known among globular clusters (0.5 <= Age (Gyr) <= 13.5 and -2.3 <= [Fe/H] <= +0.1, respectively). This database will form the crucial basis for our ongoing, comprehensive multi-wavelength program to: (1) establish empirical relations among SSP colors (from the UV [GALEX] through the mid-IR [Spitzer]), line strengths, ages and metallicities, and (2) provide a stringent test of the systemic accuracy of age and metallicity determinations using state-of-the-art population synthesis models.
The target globular clusters younger than an estimated age of about 4 Gyr are observed in F435W, F555W and F814W except for the older cluster ESO 121-SC03, which is observed in F435W, F606W, and F814W (since good CMDs for "old" Galactic clusters straddling the estimated metallicity of ESO 121-SC03 are only available in ACS/WFC F606W, not in F555W), using ACS/WFC. Three filters are used to improve the age estimate (relative to the use of only two filters) and to enable an estimate of the reddening for these clusters. Since the shape and position of the giant branch is used to determine metallicities, it is imperative to involve exposures in each filter that do not saturate the bright giants. On the other hand, an accurate age determination by comparing the CMD with isochrones requires color uncertainties of about 0.1 mag at or slightly beyond the estimated turnoff magnitude, which dictates the need for long exposures as well. Hence, a short exposure is used in each filter to avoid saturation of the brightest giants (and the turn-off stars for the youngest clusters), while two or three longer exposures are used to reach a depth sufficiently beyond the estimated turnoff magnitude. Two dither positions per cluster are used. The orbit lengths are set to 70 min. This doesn't impede their schedulability at the declination of the Large Magellanic Cloud according to the visit planner. As requested in Phase I, we will observe ESO 121-SC03 in the Continuous Viewing Zone. The fact that the Earthshine will be somewhat higher during CVZ orbits than during non-CVZ orbits is not detrimental for the proposed observations, since the limiting factor for S/N ratios in our case is the `background' associated with the crowded star field of the LMC. STELLAR POPULATIONS 12 false 0.0 false false false false false SUPPORTED STELLAR CLUSTER GLOBULAR CLUSTER NGC1751 J2000 04 54 12.0000 -69 48 24.00 J2000 STELLAR CLUSTER GLOBULAR CLUSTER NGC1806 J2000 05 02 11.0000 -67 59 20.00 J2000 STELLAR CLUSTER GLOBULAR CLUSTER NGC1846 J2000 05 07 35.0000 -67 27 39.00 J2000 STELLAR CLUSTER GLOBULAR CLUSTER NGC1987 J2000 05 27 17.0000 -70 44 6.00 J2000 STELLAR CLUSTER GLOBULAR CLUSTER NGC2108 J2000 05 43 56.9000 -69 10 56.00 J2000 STELLAR CLUSTER GLOBULAR CLUSTER J2000 06 03 24.0000 -60 31 0.00 J2000 STELLAR CLUSTER GLOBULAR CLUSTER NGC1783 J2000 04 59 8.0000 -65 59 20.00 J2000 STELLAR CLUSTER GLOBULAR CLUSTER LW431 J2000 06 13 27.0000 -70 41 43.00 J2000 STELLAR CLUSTER GLOBULAR CLUSTER NGC1751 J2000 04 54 12.0000 -69 48 24.00 J2000 ACS/WFC Imaging No No F435W ACS/WFC Imaging No No F555W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F435W ACS/WFC Imaging No No F555W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F435W ACS/WFC Imaging No No F555W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F435W ACS/WFC Imaging No No F555W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F435W ACS/WFC Imaging No No F555W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F435W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F606W ACS/WFC Imaging No No F435W ACS/WFC Imaging No No F555W ACS/WFC Imaging No No F814W ACS/WFC Imaging No No F435W ACS/WFC Imaging No No F555W ACS/WFC Imaging No No F814W POS-TARG DITHER 3.011 LINE false false 2 85.28 ACS-WFC-DITHER-LINE 1 false NGC1751 visit (Tic-Visit :proposal-id 10595 :visit-id "01" :proposal-version -1 :trans-version "20050323" :date "10-May-2005 13:46:14.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2558016 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10595 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10595 :visit-id "01" :orbit-number 1 :pcs-time 367 :si-vis-utilization 4353 :al-overhead-at-end 0 :internal-dur-at-end 349 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 4730.0 :pcs-gap 0 ) false 1 0 NGC1806 visit (Tic-Visit :proposal-id 10595 :visit-id "02" :proposal-version -1 :trans-version "20050323" :date "12-May-2005 17:47:11.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2558016 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10595 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10595 :visit-id "02" :orbit-number 1 :pcs-time 367 :si-vis-utilization 4353 :al-overhead-at-end 0 :internal-dur-at-end 349 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 4730.0 :pcs-gap 0 ) false 1 0 NGC1846 visit (Tic-Visit :proposal-id 10595 :visit-id "03" :proposal-version -1 :trans-version "20050323" :date "12-May-2005 17:47:24.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2558016 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10595 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10595 :visit-id "03" :orbit-number 1 :pcs-time 367 :si-vis-utilization 4353 :al-overhead-at-end 0 :internal-dur-at-end 349 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 4730.0 :pcs-gap 0 ) false 1 0 NGC1987 visit; ORIENT range chosen to avoid V < 10 mag star in field. (Tic-Visit :proposal-id 10595 :visit-id "04" :proposal-version -1 :trans-version "20050323" :date "12-May-2005 18:14:42.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2558016 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10595 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10595 :visit-id "04" :orbit-number 1 :pcs-time 367 :si-vis-utilization 4353 :al-overhead-at-end 0 :internal-dur-at-end 349 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 4730.0 :pcs-gap 0 ) false 1 0 NGC2108 visit (Tic-Visit :proposal-id 10595 :visit-id "05" :proposal-version -1 :trans-version "20050323" :date "12-May-2005 17:47:55.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2558016 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10595 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10595 :visit-id "05" :orbit-number 1 :pcs-time 367 :si-vis-utilization 4353 :al-overhead-at-end 0 :internal-dur-at-end 349 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 4730.0 :pcs-gap 0 ) false 1 0 ESO 121-SC03 visit (Tic-Visit :proposal-id 10595 :visit-id "06" :proposal-version -1 :trans-version "20050323" :date "12-May-2005 17:48:08.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2842240 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10595 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 10595 :visit-id "06" :orbit-number 1 :pcs-time 367 :si-vis-utilization 4970 :al-overhead-at-end 0 :internal-dur-at-end 349 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) false 1 0 NGC1783 visit (Tic-Visit :proposal-id 10595 :visit-id "07" :proposal-version -1 :trans-version "20050323" :date "12-May-2005 17:48:29.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2558016 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10595 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10595 :visit-id "07" :orbit-number 1 :pcs-time 367 :si-vis-utilization 4353 :al-overhead-at-end 0 :internal-dur-at-end 349 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 4730.0 :pcs-gap 0 ) false 1 0 LW431 visit. ORIENT range chosen to avoid blooming spike from bright star near target (within FOV). 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