15062( 4) - 06-Dec-2018 18:09:05 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15062 Version: 4 Check-in Time: 06-Dec-2018 18:09:05 STScI Edit Number: 0 Title Extending the Search for Multiple Populations in Massive Intermediate Age Clusters ------------------------------------------------------------------------------------ Type Cycle GO 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Nate Bastian Liverpool John Moores University Y CoI: Dr. Ivan Cabrera-Ziri Harvard University N CoI: Dr. Vera Kozhurina-Platais Space Telescope Science Institute Y CoI: Dr. Soeren S. Larsen Radboud Universiteit Nijmegen N CoI: Dr. Douglas Geisler Universidad de Concepcion N CoI: Dr. Imants Platais The Johns Hopkins University N CoI: Dr. Emanuele Dalessandro INAF, Osservatorio Astronomico di Bologna N CoI: Dr. Alessio Mucciarelli Universita di Bologna N CoI: Dr. Maurizio Salaris Liverpool John Moores University N CoI: Florian Niederhofer Leibniz-Institut fur Astrophysik Potsdam N (AIP) CoI: Dr. Nikolay Kacharov Max-Planck-Institut fur Astronomie, N Heidelberg CoI: Dr. Dougal Mackey Australian National University N CoI: Ms. Katie Hollyhead Stockholm University N CoI: Dr. Carmela Lardo Ecole Polytechnique Federale de Lausanne N CoI: Dr. Christopher Usher Liverpool John Moores University N CoI: Dr. William Chantereau Liverpool John Moores University N CoI: Ms. Silvia Martocchia Liverpool John Moores University N ------------------------------------------------------------------------------------ Abstract We propose to obtain imaging of 4 massive clusters in the LMC/SMC, spanning an age range of 2-6.5 Gyr, in order to search for chemical abundance spreads (i.e. multiple populations - MPs) within them. This proposal is meant to compliment our Cycle 23 proposal, which had the unexpected result where we found MPs in all clusters older than 6 Gyr (4 clusters) and did not find MPs in any clusters younger than 2 Gyr (8 clusters). Here we will explore this age gap to pinpoint the exact age where MPs begin to occur on the red giant branch (RGB), which will in turn show the stellar mass where MPs can develop. Additionally, we will study one 6.5 Gyr cluster that is a factor of ~3 less massive than previously studied to look for the influence of cluster mass on whether MPs can develop. The proposed sample occupies a critical region of parameter space (age/mass) where there are no Milky Way counterparts. ------------------------------------------------------------------------------------ Observations Description ------------------------ We propose to obtain imaging of 4 massive star clusters one within the LMC/SMC, spanning a wide range of ages (0.1 - 10 Gyr), in order to search for elemental abundance spreads and multiple populations. The clusters will be observed in the F343N, F336W and F438W WFC3/UVIS filters, which will provide accurate color-magnitude diagrams (CMD) for studies of these phenomena. 15062( 4) - 06-Dec-2018 18:09:05 - [ 2] A CMD for such a large range of stellar ages covers everything from red and very bright giants down to the main sequence stars of various brightness and colors. To reach our science goals, it is crucial not to saturate the bright giants by using a short exposure and to reach a sufficient depth beyond the main-sequence turn-off using long exposures. Therefore, for each cluster, a short exposure and long exposures with CR-split in each filter are required. To cover the gap between the two WFC3/UVIS CCD chips, we use two dithered pointings. In order to maximize the overlap, we also require a specific orientation to match the orientation of those target clusters which have archival observations with the WFC3/UVIS. This orientation is specified in the Visit Orientation Requirement for these clusters/visits as follows: Visit1 - ngc419, Min=307, Max=307; Visit2 - ngc104 (47Tuc), Min=0, Min=1 ------------------------------------------------------------------------------------ 15062( 4) - 06-Dec-2018 18:09:05 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-2121 STELLAR CLUSTER, RA=05H48M13.1900S +/- 0.1", J2000 V = 12.37 GLOBULAR CLUSTER DEC=-71D28'52.00" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-2155 STELLAR CLUSTER, RA=05H58M32.0700S +/- 0.1", J2000 V = 12.6 GLOBULAR CLUSTER DEC=-65D28'38.62" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 3 CL-LINDSAY-1 STELLAR CLUSTER, RA=01H49M30.0000S +/- 0.1", J2000 V = 14.5 13 GLOBULAR CLUSTER DEC=-73D43'40.00" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 4 ESO-51-3 STELLAR CLUSTER, RA=00H48M50.0000S +/- 0.1", J2000 V = 14.5 GLOBULAR CLUSTER DEC=-69D52'12.00" +/- 0.1" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 15062( 4) - 06-Dec-2018 18:09:05 - [ 4] Visit: 01 (Visit 01 - NGC2121) Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-2121 WFC3/UVI ACCUM UVIS F438W FLASH=12 1 120 S (120 POS TARG 0.18, 2.44 S S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-2121 WFC3/UVI ACCUM UVIS F438W FLASH=10, CR-SPLIT=2 1 1100 S POS TARG -0.1, -0.06 S (1100 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-2121 WFC3/UVI ACCUM UVIS F336W FLASH=10, CR-SPLIT=2 1 1430 S POS TARG 0.18, 2.44 S (1430 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-2121 WFC3/UVI ACCUM UVIS F343N FLASH=12 1 540 S (540 POS TARG -0.1, -0.06 S S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-2121 WFC3/UVI ACCUM UVIS F343N FLASH=12, CR-SPLIT=2 1 2120 S POS TARG 0.18, 2.44 S (2120 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-2121 WFC3/UVI ACCUM UVIS F336W FLASH=12 1 270 S (270 POS TARG -0.1, -0.06 S S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-2121 1 WFC3/UVI ACCUM UVIS F438W none none none none 1 N/A S NGC-2121 2 WFC3/UVI ACCUM UVIS F438W none none none 1 1 N/A S NGC-2121 2 WFC3/UVI ACCUM UVIS F438W none none none 2 1 N/A S NGC-2121 3 WFC3/UVI ACCUM UVIS F336W none none none 1 1 N/A S NGC-2121 3 WFC3/UVI ACCUM UVIS F336W none none none 2 1 N/A S NGC-2121 4 WFC3/UVI ACCUM UVIS F343N none none none none 2 N/A S NGC-2121 5 WFC3/UVI ACCUM UVIS F343N none none none 1 2 N/A S NGC-2121 5 WFC3/UVI ACCUM UVIS F343N none none none 2 2 N/A S NGC-2121 6 WFC3/UVI ACCUM UVIS F336W none none none none 2 N/A S 15062( 4) - 06-Dec-2018 18:09:05 - [ 5] Visit: 02 (Visit 02 - NGC2155) Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-2155 WFC3/UVI ACCUM UVIS F438W FLASH=12 1 120 S (120 POS TARG 0.18, 2.44 S S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-2155 WFC3/UVI ACCUM UVIS F438W FLASH=10, CR-SPLIT=2 1 1090 S POS TARG -0.1, -0.06 S (1090 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-2155 WFC3/UVI ACCUM UVIS F336W FLASH=10, CR-SPLIT=2 1 1410 S POS TARG 0.18, 2.44 S (1410 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-2155 WFC3/UVI ACCUM UVIS F343N FLASH=12 1 530 S (530 POS TARG -0.1, -0.06 S S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-2155 WFC3/UVI ACCUM UVIS F343N FLASH=12, CR-SPLIT=2 1 2120 S POS TARG 0.18, 2.44 S (2120 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-2155 WFC3/UVI ACCUM UVIS F336W FLASH=12 1 250 S (250 POS TARG -0.1, -0.06 S S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NGC-2155 1 WFC3/UVI ACCUM UVIS F438W none none none none 1 N/A S NGC-2155 2 WFC3/UVI ACCUM UVIS F438W none none none 1 1 N/A S NGC-2155 2 WFC3/UVI ACCUM UVIS F438W none none none 2 1 N/A S NGC-2155 3 WFC3/UVI ACCUM UVIS F336W none none none 1 1 N/A S NGC-2155 3 WFC3/UVI ACCUM UVIS F336W none none none 2 1 N/A S NGC-2155 4 WFC3/UVI ACCUM UVIS F343N none none none none 2 N/A S NGC-2155 5 WFC3/UVI ACCUM UVIS F343N none none none 1 2 N/A S NGC-2155 5 WFC3/UVI ACCUM UVIS F343N none none none 2 2 N/A S NGC-2155 6 WFC3/UVI ACCUM UVIS F336W none none none none 2 N/A S 15062( 4) - 06-Dec-2018 18:09:05 - [ 6] Visit: 03 (Visit 03 - Lindsay113) Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 CL-LINDSAY- WFC3/UVI ACCUM UVIS F438W FLASH=12 1 128 S (128 POS TARG 0.18, 2.44 113 S S) ------------------------------------------------------------------------------------------------------------------------------------ 2 CL-LINDSAY- WFC3/UVI ACCUM UVIS F438W FLASH=10, CR-SPLIT=2 1 1090 S POS TARG -0.1, -0.06 113 S (1090 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 CL-LINDSAY- WFC3/UVI ACCUM UVIS F336W FLASH=10, CR-SPLIT=2 1 1440 S POS TARG 0.18, 2.44 113 S (1440 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 CL-LINDSAY- WFC3/UVI ACCUM UVIS F343N FLASH=12 1 530 S (530 POS TARG -0.1, -0.06 113 S S) ------------------------------------------------------------------------------------------------------------------------------------ 5 CL-LINDSAY- WFC3/UVI ACCUM UVIS F343N FLASH=12, CR-SPLIT=2 1 2130 S POS TARG 0.18, 2.44 113 S (2130 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 CL-LINDSAY- WFC3/UVI ACCUM UVIS F336W FLASH=12 1 274 S (274 POS TARG -0.1, -0.06 113 S S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ CL-LINDSAY-113 1 WFC3/UVI ACCUM UVIS F438W none none none none 1 N/A S CL-LINDSAY-113 2 WFC3/UVI ACCUM UVIS F438W none none none 1 1 N/A S CL-LINDSAY-113 2 WFC3/UVI ACCUM UVIS F438W none none none 2 1 N/A S CL-LINDSAY-113 3 WFC3/UVI ACCUM UVIS F336W none none none 1 1 N/A S CL-LINDSAY-113 3 WFC3/UVI ACCUM UVIS F336W none none none 2 1 N/A S CL-LINDSAY-113 4 WFC3/UVI ACCUM UVIS F343N none none none none 2 N/A S CL-LINDSAY-113 5 WFC3/UVI ACCUM UVIS F343N none none none 1 2 N/A S CL-LINDSAY-113 5 WFC3/UVI ACCUM UVIS F343N none none none 2 2 N/A S CL-LINDSAY-113 6 WFC3/UVI ACCUM UVIS F336W none none none none 2 N/A S 15062( 4) - 06-Dec-2018 18:09:05 - [ 7] Visit: 04 (Visit 04 - ESO-51-3) Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 ESO-51-3 WFC3/UVI ACCUM UVIS F438W FLASH=12 1 123 S (123 POS TARG 0.18, 2.44 S S) ------------------------------------------------------------------------------------------------------------------------------------ 2 ESO-51-3 WFC3/UVI ACCUM UVIS F438W FLASH=10, CR-SPLIT=2 1 1076 S POS TARG -0.1, -0.06 S (1076 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ESO-51-3 WFC3/UVI ACCUM UVIS F336W FLASH=10, CR-SPLIT=2 1 1420 S POS TARG 0.18, 2.44 S (1420 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 ESO-51-3 WFC3/UVI ACCUM UVIS F343N FLASH=12 1 515 S (515 POS TARG -0.1, -0.06 S S) ------------------------------------------------------------------------------------------------------------------------------------ 5 ESO-51-3 WFC3/UVI ACCUM UVIS F343N FLASH=12, CR-SPLIT=2 1 2115 S POS TARG 0.18, 2.44 S (2115 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 ESO-51-3 WFC3/UVI ACCUM UVIS F336W FLASH=12 1 268 S (268 POS TARG -0.1, -0.06 S S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ ESO-51-3 1 WFC3/UVI ACCUM UVIS F438W none none none none 1 N/A S ESO-51-3 2 WFC3/UVI ACCUM UVIS F438W none none none 1 1 N/A S ESO-51-3 2 WFC3/UVI ACCUM UVIS F438W none none none 2 1 N/A S ESO-51-3 3 WFC3/UVI ACCUM UVIS F336W none none none 1 1 N/A S ESO-51-3 3 WFC3/UVI ACCUM UVIS F336W none none none 2 1 N/A S ESO-51-3 4 WFC3/UVI ACCUM UVIS F343N none none none none 2 N/A S ESO-51-3 5 WFC3/UVI ACCUM UVIS F343N none none none 1 2 N/A S ESO-51-3 5 WFC3/UVI ACCUM UVIS F343N none none none 2 2 N/A S ESO-51-3 6 WFC3/UVI ACCUM UVIS F336W none none none none 2 N/A S 15062( 4) - 06-Dec-2018 18:09:05 - [ 8] Summary Form for Proposal 15062 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=2, FLASH=10, FLASH=12 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements POS TARG -0.1, -0.06, POS TARG 0.18, 2.44 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F336W, F343N, F438W ------------------------------------------------------------------------------------------------------------------------------------ Target Names CL-LINDSAY-113, ESO-51-3, NGC-2121, NGC-2155 ------------------------------------------------------------------------------------------------------------------------------------