11558( 2) - 30-Jun-2009 14:38:26 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11558 Version: 2 Check-in Time: 30-Jun-2009 14:38:26 STScI Edit Number: 0 Title Planetary Nebulae, Globular Clusters and Binary Mergers ------------------------------------------------------------------------------------ Type Cycle GO 17 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Orsola De Marco American Museum of Natural History CoI: Dr. George Jacoby National Optical Astronomy Observatories, N AURA CoI: Dr. Howard E. Bond Space Telescope Science Institute N CoI: Dr. J. Patrick Harrington University of Maryland N ------------------------------------------------------------------------------------ Abstract Four planetary nebulae (PNe) have been found within 130 of the 150 globular clusters (GCs) of our Galaxy. This might not seem like many, but stellar evolution predicts that the old populations of these clusters should contain no PN at all! Observations of three of the four GC PNe show them to have peculiar characteristics, possibly indicative of a binary/merger origin. In particular two of the three observed GC PNe have masses which correspond to main sequence masses ~2-3 times the clusters' turn-off masses, sugesting mergers of two, or even three stars have taken place. One of the three observed PNe is H-deficient, a characteristic exhibited by only 5 out of hundreds of field PNe. H-deficient PNe have been associated with binarity. As usual, not all parameters for these three PNe are clean indications of their binary origin. In an approved cycle 15 ACS/WFI proposal we asked to obtain observations of the only GC PN that has never been observed before at high resolution and whose central star has never been detected, as well as of the one H-deficient GC PN for which only low-quality WFPC2 images exist. When ACS stopped working we moved part of the observations to WFPC2. With this proposal we ask to complete our project, by obtaining two ACS/WFI images that could not be efficiently taken with WFPC2. These objects could tip the balance toward a binary interpretation for the GC PNe or make us seriously reconsider our understanding of stellar evolution in old populations. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will aquire ACS/WFI observations in the [OIII] filter (F502N) of the PNs JaFu1 and IRAS18333-2357. For JaFu1 (one orbit, one visit) we will use a 3-point dither pattern (796s x 3). For IRAS18333 we will use 2 orbits and a 4-point dither pattern, where 2 pointings will be taken in each orbit (441s x 2, 2322s, 2102s). We will center our objects on the WFC1 to insure that we do not end up in the gap between the two chips. Real Time Justification ----------------------- Calibration Justification ------------------------- 11558( 2) - 30-Jun-2009 14:38:26 - [ 2] Additional Comments ------------------- A few changes were made to Phase II compared to what was proposed in Phase I. These have all been pre-approved. They are: a switch from HRC to WFI for the entire program. ------------------------------------------------------------------------------------ 11558( 2) - 30-Jun-2009 14:38:26 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 PN-JAFU-1 ISM, EJECTA, EMISSION RA=17H43M57.2100S +/- 0.01S, J2000 [OIII]=5.8e-15 erg/s/cm2/asec2 LINE NEBULA, PLANETARY DEC=-26D11'53.45" +/- 0.14" (observed) NEBULA Reference Frame: Other: WFPC2 IMAGE Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 2 IRAS18333-23 ISM, EJECTA, EMISSION RA=18H36M22.8800S +/- 0.01S, J2000 V = 14.3 +/- 0.1 [OIII]=2.8e-15 57 LINE NEBULA, PLANETARY DEC=-23D55'22.46" +/- 0.13" erg/s/cm2/asec2 (observed) NEBULA Reference Frame: Other: WFPC2 IMAGE Comments: ------------------------------------------------------------------------------------------------------------------------------------ 11558( 2) - 30-Jun-2009 14:38:26 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 3.0 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.28 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 3.0 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.28 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 11558( 2) - 30-Jun-2009 14:38:26 - [ 5] Visit: 01 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 IRAS18333-2 ACS/WFC ACCUM WFC1 F502N CR-SPLIT=NO 1 4860 S PATTERN 2 1 357 see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ IRAS18333-2357 1 ACS/WFC ACCUM WFC1 F502N 1 none none none 1 441.0 S IRAS18333-2357 1 ACS/WFC ACCUM WFC1 F502N 2 none none none 1 2102.0 S IRAS18333-2357 1 ACS/WFC ACCUM WFC1 F502N 3 none none none 2 441.0 S IRAS18333-2357 1 ACS/WFC ACCUM WFC1 F502N 4 none none none 2 2322.0 S 11558( 2) - 30-Jun-2009 14:38:26 - [ 6] Visit: 02 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PN-JAFU-1 ACS/WFC ACCUM WFC1 F502N 1 1000 S PATTERN 1 1 see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ PN-JAFU-1 1 ACS/WFC ACCUM WFC1 F502N 1 none none none 1 796.0 S PN-JAFU-1 1 ACS/WFC ACCUM WFC1 F502N 2 none none none 1 796.0 S PN-JAFU-1 1 ACS/WFC ACCUM WFC1 F502N 3 none none none 1 796.0 S 11558( 2) - 30-Jun-2009 14:38:26 - [ 7] Summary Form for Proposal 11558 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F502N ------------------------------------------------------------------------------------------------------------------------------------ Target Names IRAS18333-2357, PN-JAFU-1 ------------------------------------------------------------------------------------------------------------------------------------