16247( 4) - 31-Jan-2022 16:56:35 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16247 Version: 4 Check-in Time: 31-Jan-2022 16:56:35 STScI Edit Number: 1 Title The radial chromosomic map of Omega Centauri ------------------------------------------------------------------------------------ Type Cycle GO 28 ------------------------------------------------------------------------------------ Investigators Contact? PI: Michele Scalco Osservatorio Astronomico di Padova Y CoI: Dr. Luigi R. Bedin Osservatorio Astronomico di Padova N CoI: Dr. Enrico Vesperini Indiana University System N ------------------------------------------------------------------------------------ Abstract A complete characterization of the spatial distributions of the different multiple stellar populations in Omega Centauri is of fundamental importance to study their formation and dynamical history. Recent studies have revealed a very complex picture of this cluster and found the presence of 15 different sub-populations groups. While previous studies have found a radial gradient in the number fraction of the two major groups of stellar populations, nothing is known about the radial variation of all the other groups of sub-populations. Studies of all the sub-populations are available in the core (from the literature) and in the outermost regions (from HST archival observations) of the cluster, while data in the intermediate regions are missing. These intermediate regions are those where the strongest radial gradient of the two major groups of stars has been found and they are thus essential to explore possible structural differences between all the different sub-groups. Here we propose to collect the missing observations needed to separate and identify all the sub-groups multiple populations in these intermediate regions. This will give us the opportunity to obtain the necessary radial coverage to trace for the first time the radial gradient of all the multiple populations along almost the entire cluster. Such a major improvement requires a relatively modest investment of only two additional HST orbits. ------------------------------------------------------------------------------------ Observations Description ------------------------ The observations consist in a short image, ~20 s, at the beggining of each orbit, and six ~350 s deep exposure (four in the F814W filter and two in the F606W filter) per orbit. WFC3/UVIS will be used as the primary camera, while ACS/WFC will image the parallel field with one ~110 s exposure in the F606W filter per orbit. ------------------------------------------------------------------------------------ 16247( 4) - 31-Jan-2022 16:56:35 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC-5139-RST STELLAR CLUSTER, RA=13H26M30.1500S, J2000 V = 5.33 TV1 GLOBULAR CLUSTER DEC=-47D33'50.00" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 -5.928302449291017E-4 -0.005019999980504508 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-5139-BRW STELLAR CLUSTER, RA=13H27M13.3510S, J2000 V = 5.33 NV1V3 GLOBULAR CLUSTER DEC=-47D32'8.37" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 -5.928302449291017E-4 -0.005019999980504508 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 16247( 4) - 31-Jan-2022 16:56:35 - [ 3] Visit: 01 Visit Requirements: ORIENT 339.1D TO 340.1 D 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-5139-RS WFC3/UVI ACCUM UVIS-CENT F814W FLASH=11 1 13 S (13 POS TARG -7.5, -7.5; SEQ TTV1 S ER S) 1-8 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-5139-RS WFC3/UVI ACCUM UVIS-CENT F814W FLASH=4 1 348 S (348 POS TARG -7.5, -7.5 TTV1 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-5139-RS WFC3/UVI ACCUM UVIS-CENT F814W FLASH=4 1 348 S (348 POS TARG -2.4901, TTV1 S ER S) -2.4801 ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-5139-RS WFC3/UVI ACCUM UVIS-CENT F814W FLASH=4 1 348 S (348 POS TARG 2.5199, 2.5099 TTV1 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-5139-RS WFC3/UVI ACCUM UVIS-CENT F814W FLASH=4 1 348 S (348 POS TARG 7.5298, 7.5298 TTV1 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-5139-RS WFC3/UVI ACCUM UVIS-CENT F606W 1 348 S (348 POS TARG -8, -8 TTV1 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-5139-RS WFC3/UVI ACCUM UVIS-CENT F606W 1 325 S (325 POS TARG 8.0198875, TTV1 S ER S) 8.0198875; PAR 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC-5139-RS ACS/WFC ACCUM WFC-FIX F814W 1 113 S (113 TTV1 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-5139-RSTTV1 1 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-5139-RSTTV1 2 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-5139-RSTTV1 3 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-5139-RSTTV1 4 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-5139-RSTTV1 5 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-5139-RSTTV1 6 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER 16247( 4) - 31-Jan-2022 16:56:35 - [ 4] 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-5139-RSTTV1 7 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER NGC-5139-RSTTV1 8 ACS/WFC ACCUM WFC-FIX F814W none none none none 1 N/A 16247( 4) - 31-Jan-2022 16:56:35 - [ 5] Visit: 02 Visit Requirements: ORIENT 43D TO 43 D; ORIENT 223D TO 223 D 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-5139-BR WFC3/UVI ACCUM UVIS-CENT F814W FLASH=11 1 13 S (13 POS TARG -7.5, -7.5; SEQ WNV1V3 S ER S) 1-8 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC-5139-BR WFC3/UVI ACCUM UVIS-CENT F814W FLASH=4 1 348 S (348 POS TARG -7.5, -7.5 WNV1V3 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC-5139-BR WFC3/UVI ACCUM UVIS-CENT F814W FLASH=4 1 348 S (348 POS TARG -2.4901, WNV1V3 S ER S) -2.4801 ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC-5139-BR WFC3/UVI ACCUM UVIS-CENT F814W FLASH=4 1 348 S (348 POS TARG 2.5199, 2.5099 WNV1V3 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC-5139-BR WFC3/UVI ACCUM UVIS-CENT F814W FLASH=4 1 348 S (348 POS TARG 7.5298, 7.5298 WNV1V3 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NGC-5139-BR WFC3/UVI ACCUM UVIS-CENT F606W 1 348 S (348 POS TARG -8, -8 WNV1V3 S ER S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NGC-5139-BR WFC3/UVI ACCUM UVIS-CENT F606W 1 325 S (325 POS TARG 8.0198875, WNV1V3 S ER S) 8.0198875; PAR 8 WITH 7 ------------------------------------------------------------------------------------------------------------------------------------ 8 NGC-5139-BR ACS/WFC ACCUM WFC-FIX F814W 1 113 S (113 WNV1V3 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-5139-BRWNV1V3 1 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-5139-BRWNV1V3 2 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-5139-BRWNV1V3 3 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-5139-BRWNV1V3 4 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-5139-BRWNV1V3 5 WFC3/UVI ACCUM UVIS-CEN F814W none none none none 1 N/A S TER NGC-5139-BRWNV1V3 6 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER 16247( 4) - 31-Jan-2022 16:56:35 - [ 6] 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-5139-BRWNV1V3 7 WFC3/UVI ACCUM UVIS-CEN F606W none none none none 1 N/A S TER NGC-5139-BRWNV1V3 8 ACS/WFC ACCUM WFC-FIX F814W none none none none 1 N/A 16247( 4) - 31-Jan-2022 16:56:35 - [ 7] Summary Form for Proposal 16247 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-CENTER, WFC-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=11, FLASH=4 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 223D TO 223 D, ORIENT 339.1D TO 340.1 D, ORIENT 43D TO 43 D, PAR 8 WITH 7, POS TARG -2.4901, -2.4801, POS TARG -7.5, -7.5, POS TARG -8, -8, POS TARG 2.5199, 2.5099, POS TARG 7.5298, 7.5298, POS TARG 8.0198875, 8.0198875, SEQ 1-8 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC-5139-BRWNV1V3, NGC-5139-RSTTV1 ------------------------------------------------------------------------------------------------------------------------------------