13769( 2) - 15-Jul-2014 16:16:27 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13769 Version: 2 Check-in Time: 15-Jul-2014 16:16:27 STScI Edit Number: 0 Title Trans-iron group elements in hot helium-rich white dwarfs ------------------------------------------------------------------------------------ Type Cycle GO 22 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Klaus Werner Eberhard Karls Universitat, Tubingen Y CoI: Dr. Thomas Rauch Eberhard Karls Universitat, Tubingen N CoI: Dr. Jeffrey W. Kruk NASA Goddard Space Flight Center N ------------------------------------------------------------------------------------ Abstract Our recent detection of twelve trans-iron group elements (Z=30-56) in the hot helium-rich white dwarf (i.e. spectral type DO) RE0503-289 is a unique discovery. This phenomenon was never observed before in any white dwarf. Abundance analyses hitherto performed for five species (Zn, Ge, Kr, Xe, Ba) reveal values between 155 and 23000 times solar. There are reasons to believe that these extreme overabundances are connected to the evolutionary history of the DO white dwarfs. They are the outcome of a late helium-shell flash that consumes all hydrogen in the stellar envelope and at the same time dredges up helium-rich intershell matter that is enriched with s-process elements. These elements were synthesised in the preceding AGB phase of the evolution. We argue that if RE0503-289 is a typical representative of the DO white dwarfs, then all DOs with similar effective temperature should also show these extraordinary chemical diversity and overabundances. In order to prove this hypothesis, we want to obtain FUV spectra of two other hot DO white dwarfs plus a representative of the PG1159 stars, which are thought to be immediate progenitors of DO white dwarfs. If all three targets show the same heavy-metal abundance pattern, then these objects hold the promise that their metal abundances can be used to constrain AGB star nucleosynthesis. If otherwise RE0503-289 remains a unique object, then an alternative evolutionary scenario (binary WD merger) is probably responsible for its extreme element abundances. ------------------------------------------------------------------------------------ Observations Description ------------------------ FUV spectra of 3 targets (stars) shall be observed , 1 visit each. For each target we use COS/G130M with central wavelength 1222 A. Targets 1 and 2: 3 orbits each. One different FP-POS per orbit Target 3: 5 orbits. FP-POS=1 in orbits 1 and 2. FP-POS=2, 3, 4 in orbits 3, 4, 5 ------------------------------------------------------------------------------------ 13769( 2) - 15-Jul-2014 16:16:27 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 PG0109+111 STAR, WDO RA=01H12M23.0800S +/- .3", J2000 V = 14.6 +/- 0.2 Flambda = 6.0E-13 at DEC=+11D23'36.10" +/- .3" 1150 A (FUSE) Reference Frame: ICRS Comments: SDSS coordinates ------------------------------------------------------------------------------------------------------------------------------------ 2 WD0111+002 STAR, WDO RA=01H13M46.7700S +/- .3", J2000 V = 14.9 +/- 0.2 Flambda = 6.5E-13 at DEC=+00D28'28.70" +/- .3" 1150 A (FUSE) Reference Frame: ICRS Comments: SDSS coordinates ------------------------------------------------------------------------------------------------------------------------------------ 3 PG1707+427 STAR, PG1159 STAR RA=17H08M47.7200S +/- .3", J2000 V = 16.4 +/- 0.2 Flambda = 2.5E-13 at DEC=+42D41'0.30" +/- .3" 1150 A (FUSE) Reference Frame: ICRS Comments: SDSS coordinates ------------------------------------------------------------------------------------------------------------------------------------ 13769( 2) - 15-Jul-2014 16:16:27 - [ 3] 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 PG0109+111 COS/FUV ACQ/SEA PSA G130M 1291 CENTER=FLUX-WT-FLR, 1 0.2 S (0.2 RCH SCAN-SIZE=3, STEP-SIZE=1.767, S) SEGMENT=BOTH ------------------------------------------------------------------------------------------------------------------------------------ 2 PG0109+111 COS/FUV ACQ/PEA PSA G130M 1291 SEGMENT=BOTH 1 0.2 S (0.2 KXD S) ------------------------------------------------------------------------------------------------------------------------------------ 3 PG0109+111 COS/FUV ACQ/PEA PSA G130M 1291 CENTER=FLUX-WT-FLR, NUM-POS=5, 1 0.2 S (0.2 KD SEGMENT=BOTH, STEP-SIZE=0.9 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 PG0109+111 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=111, EXTENDED=NO, 1 2136 S G FLASH=YES, FP-POS=1, (2136 S) SEGMENT=BOTH Comments: BUFFER-TIME: ETC recommends 151 *2/3 = 100. According to instrument handbook section 5.4.3, we set 111. ------------------------------------------------------------------------------------------------------------------------------------ 5 PG0109+111 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=111, EXTENDED=NO, 1 2940 S G FLASH=YES, FP-POS=2, (2940 S) SEGMENT=BOTH ------------------------------------------------------------------------------------------------------------------------------------ 6 PG0109+111 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=111, EXTENDED=NO, 1 2940 S G FLASH=YES, FP-POS=3, (2940 S) SEGMENT=BOTH ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ PG0109+111 1 COS/FUV ACQ/SEA PSA G130M 1291 none none none none 1 N/A RCH PG0109+111 2 COS/FUV ACQ/PEA PSA G130M 1291 none none none none 1 N/A KXD PG0109+111 3 COS/FUV ACQ/PEA PSA G130M 1291 none none none none 1 N/A KD PG0109+111 4 COS/FUV TIME-TA PSA G130M 1222 none none none none 1 N/A G PG0109+111 5 COS/FUV TIME-TA PSA G130M 1222 none none none none 2 N/A G 13769( 2) - 15-Jul-2014 16:16:27 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ PG0109+111 6 COS/FUV TIME-TA PSA G130M 1222 none none none none 3 N/A G 13769( 2) - 15-Jul-2014 16:16:27 - [ 5] 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 WD0111+002 COS/FUV ACQ/SEA PSA G130M 1291 CENTER=FLUX-WT-FLR, 1 0.2 S (0.2 RCH SCAN-SIZE=3, SEGMENT=BOTH, S) STEP-SIZE=1.767 ------------------------------------------------------------------------------------------------------------------------------------ 2 WD0111+002 COS/FUV ACQ/PEA PSA G130M 1291 SEGMENT=BOTH 1 0.2 S (0.2 KXD S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WD0111+002 COS/FUV ACQ/PEA PSA G130M 1291 CENTER=FLUX-WT-FLR, NUM-POS=5, 1 0.2 S (0.2 KD SEGMENT=BOTH, STEP-SIZE=0.9 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WD0111+002 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=111, EXTENDED=NO, 1 2132 S G FLASH=YES, FP-POS=1, (2132 S) SEGMENT=BOTH Comments: BUFFER-TIME: ETC recommends 139 *2/3 = 92. According to instrument handbook sect. 5.4.3 we set 111 ------------------------------------------------------------------------------------------------------------------------------------ 5 WD0111+002 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=111, EXTENDED=NO, 1 2936 S G FLASH=YES, FP-POS=2, (2936 S) SEGMENT=BOTH ------------------------------------------------------------------------------------------------------------------------------------ 6 WD0111+002 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=111, EXTENDED=NO, 1 2936 S G FLASH=YES, FP-POS=3, (2936 S) SEGMENT=BOTH ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD0111+002 1 COS/FUV ACQ/SEA PSA G130M 1291 none none none none 1 N/A RCH WD0111+002 2 COS/FUV ACQ/PEA PSA G130M 1291 none none none none 1 N/A KXD WD0111+002 3 COS/FUV ACQ/PEA PSA G130M 1291 none none none none 1 N/A KD WD0111+002 4 COS/FUV TIME-TA PSA G130M 1222 none none none none 1 N/A G WD0111+002 5 COS/FUV TIME-TA PSA G130M 1222 none none none none 2 N/A G 13769( 2) - 15-Jul-2014 16:16:27 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD0111+002 6 COS/FUV TIME-TA PSA G130M 1222 none none none none 3 N/A G 13769( 2) - 15-Jul-2014 16:16:27 - [ 7] Visit: 03 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 PG1707+427 COS/FUV ACQ/SEA PSA G130M 1291 CENTER=FLUX-WT-FLR, 1 0.4 S (0.4 RCH SCAN-SIZE=3, SEGMENT=BOTH, S) STEP-SIZE=1.767 ------------------------------------------------------------------------------------------------------------------------------------ 2 PG1707+427 COS/FUV ACQ/PEA PSA G130M 1291 SEGMENT=BOTH 1 0.4 S (0.4 KXD S) ------------------------------------------------------------------------------------------------------------------------------------ 3 PG1707+427 COS/FUV ACQ/PEA PSA G130M 1291 CENTER=FLUX-WT-FLR, NUM-POS=5, 1 0.4 S (0.4 KD SEGMENT=BOTH, STEP-SIZE=0.9 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 PG1707+427 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=234, EXTENDED=NO, 1 2223 S G FLASH=YES, FP-POS=1, (2223 S) SEGMENT=BOTH ------------------------------------------------------------------------------------------------------------------------------------ 5 PG1707+427 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=234, EXTENDED=NO, 1 3030 S G FLASH=YES, FP-POS=1, (3030 S) SEGMENT=BOTH ------------------------------------------------------------------------------------------------------------------------------------ 6 PG1707+427 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=234, EXTENDED=NO, 1 3030 S G FLASH=YES, FP-POS=2, (3030 S) SEGMENT=BOTH ------------------------------------------------------------------------------------------------------------------------------------ 7 PG1707+427 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=234, EXTENDED=NO, 1 3030 S G FLASH=YES, FP-POS=3, (3030 S) SEGMENT=BOTH ------------------------------------------------------------------------------------------------------------------------------------ 8 PG1707+427 COS/FUV TIME-TA PSA G130M 1222 BUFFER-TIME=234, EXTENDED=NO, 1 3030 S G FLASH=YES, FP-POS=4, (3030 S) SEGMENT=BOTH ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ PG1707+427 1 COS/FUV ACQ/SEA PSA G130M 1291 none none none none 1 N/A RCH PG1707+427 2 COS/FUV ACQ/PEA PSA G130M 1291 none none none none 1 N/A KXD PG1707+427 3 COS/FUV ACQ/PEA PSA G130M 1291 none none none none 1 N/A KD 13769( 2) - 15-Jul-2014 16:16:27 - [ 8] 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 | ------------------------------------------------------------------------------------------------------------------------------------ PG1707+427 4 COS/FUV TIME-TA PSA G130M 1222 none none none none 1 N/A G PG1707+427 5 COS/FUV TIME-TA PSA G130M 1222 none none none none 2 N/A G PG1707+427 6 COS/FUV TIME-TA PSA G130M 1222 none none none none 3 N/A G PG1707+427 7 COS/FUV TIME-TA PSA G130M 1222 none none none none 4 N/A G PG1707+427 8 COS/FUV TIME-TA PSA G130M 1222 none none none none 5 N/A G 13769( 2) - 15-Jul-2014 16:16:27 - [ 9] Summary Form for Proposal 13769 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/PEAKD, ACQ/PEAKXD, ACQ/SEARCH, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=111, BUFFER-TIME=234, CENTER=FLUX-WT-FLR, EXTENDED=NO, FLASH=YES, FP-POS=1, FP-POS=2, FP-POS=3, FP-POS=4, NUM-POS=5, SCAN-SIZE=3, SEGMENT=BOTH, STEP-SIZE=0.9, STEP-SIZE=1.767 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M ------------------------------------------------------------------------------------------------------------------------------------ Target Names PG0109+111, PG1707+427, WD0111+002 ------------------------------------------------------------------------------------------------------------------------------------