14126( 3) - 23-Jul-2015 21:29:42 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14126 Version: 3 Check-in Time: 23-Jul-2015 21:29:42 STScI Edit Number: 0 Title Startlingly fast evolution of the Stingray Nebula ------------------------------------------------------------------------------------ Type Cycle GO 23 ------------------------------------------------------------------------------------ Investigators Contact? PI: Mr. Zachary Edwards Louisiana State University and A & M Y College CoI: Prof. Bradley E. Schaefer Louisiana State University and A & M N College CoI: Dr. Howard E. Bond The Pennsylvania State University N CoI: Dr. Kailash C. Sahu Space Telescope Science Institute N CoI: Mr. Zhichao Xue Louisiana State University and A & M N College ------------------------------------------------------------------------------------ Abstract The Stingray Nebula provides the unique opportunity to watch the ionization of a planetary nebula, a helium shell flash, and the evolution of the central star. Importantly, before 1980 the Stingray's spectrum was characteristic of a B1 I star, then in 1990 the Stingray's spectrum was dominated by bright emission lines characteristic of a young planetary nebula, indicating the fast evolution of this system. Despite its fast evolution, the Stingray has not been imaged for 15 years. We propose to use 2 orbits of HST, using WFC3, to define the evolution of this planetary nebula and its central star. These observation will address three science goals: First, measure the differential expansion of the shell from 1992 to present. Second, detect brightening from the fast wind of the 1980s ionization event impacting the inside of the planetary nebula shell. Third, define the motion of the central star through the HR diagram to provide quantitative measures for comparison to theory. This program cannot be done from ground-based observatories since it requires HST's angular resolution to detect expansion, and resolve the central star from the surrounding nebula. ------------------------------------------------------------------------------------ Observations Description ------------------------ We propose to take WFC3 images of the Stingray to answer three main science questions: First, we will measure the differential expansion of the shell from 1992 to present. Second, we will detect the collision of the fast stellar wind from the 1980s with the PN shell. Third, we will define the current position of the central star on the HR diagram so as to follow its fast and startling evolution. All three goals can be accomplished with just two HST orbits of imaging with WFC3-UVIS. We will take exposures through narrow band filters F502N ([O III]), F487N (H_beta), and F658N ([N II]) as to nearly match the exposures from the first epoch images. Indeed, these first epoch images provide the proof that our exposure times will produce good S/N and not be saturated in the nebula. We will also take short and long exposures through the F438W (B), F555W (V), and F625W (SDSS r') filters. 14126( 3) - 23-Jul-2015 21:29:42 - [ 2] To accomplish the first two science goals, we will use our narrow band images in 2015 as second epoch images, for direct comparison with first epoch HST images variously from 1992, 1996, and 2000. Our analysis is to make a direct comparison to measure the expansion and to difference the images to seek the collisional brightening. Within two HST orbits, we have time for three narrow-band filters, and these must be F502N ([O III]), F487N (H_beta), and F658N ([N II]). These three filters have the highest S/N in the nebula, and they have the most first epoch images. (The 1992 data set has both [O III] and H_beta, the 1996 set has all three, while the 2000 images include [O III] and [N II].) The three sets of old first epoch images will provide multiple time baselines of 23 years, 19 years, and 15 years. Our original observing plan was to take short exposures in F487N and F658N to protect against overstaturation due to unexpected brigthening. After calculating the expected counts, the long exposures are far from overstaturation and thus we do not require the short observations. Therefore, we are reallocating the time orignially used for the F487N and F658N filters to take an exposure in the F656N filter. This provides yet another filter with high S/N to accomplish our first two stated science goals. In addition, we are left with ~5 minutes of unused orbital visability. Thus, in addition our proposed program, we will get a long exposure in [SII] (F673N). This additional filter (providing a 19 year baseline) will allow us to a 5th measure of the shell expansion as well as provide another spectral element to detect any collisional brightening. ------------------------------------------------------------------------------------ 14126( 3) - 23-Jul-2015 21:29:42 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NAME-STINGRA STAR, EMISSION LINE RA=17H16M21.0800S, J2000 V = 12.26 +/- 0.01 Y-NEBULA NEBULA, PLANETARY DEC=-59D29'23.30" NEBULA CENTRAL STAR Reference Frame: Other: SIMBAD Extended: YES Comments: This object was generated by the target selector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 14126( 3) - 23-Jul-2015 21:29:42 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.173 Line_Spacing 0.112 Coordinate_Frame POS-TARG Pattern_Orient 23.884 Angle_Between_Sides 81.785 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 14126( 3) - 23-Jul-2015 21:29:42 - [ 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NAME-STINGR WFC3/UVI ACCUM UVIS2-C51 F502N CR-SPLIT=NO, FLASH=12 1 15 S (60 PATTERN 1 1-12 AY-NEBULA S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NAME-STINGR WFC3/UVI ACCUM UVIS2-C51 F502N FLASH=11, CR-SPLIT=NO 1 150 S (600 AY-NEBULA S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NAME-STINGR WFC3/UVI ACCUM UVIS2-C51 F487N CR-SPLIT=NO, FLASH=11 1 150 S (600 AY-NEBULA S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NAME-STINGR WFC3/UVI ACCUM UVIS2-C51 F658N CR-SPLIT=NO, FLASH=11 1 150 S (600 AY-NEBULA S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NAME-STINGR WFC3/UVI ACCUM UVIS2-C51 F656N CR-SPLIT=NO, FLASH=12 1 60 S AY-NEBULA S 2C-SUB see below (382 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 NAME-STINGR WFC3/UVI ACCUM UVIS2-C51 F673N FLASH=11, CR-SPLIT=NO 1 90 S (360 AY-NEBULA S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NAME-STINGR WFC3/UVI ACCUM UVIS2-C51 F555W CR-SPLIT=NO, FLASH=12, BLADE=A 1 1 S (4 S) AY-NEBULA S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 8 NAME-STINGR WFC3/UVI ACCUM UVIS2-C51 F555W CR-SPLIT=NO, FLASH=11 1 15 S (60 AY-NEBULA S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 9 NAME-STINGR WFC3/UVI ACCUM UVIS2-C51 F625W FLASH=12, CR-SPLIT=NO, BLADE=A 1 1 S (4 S) AY-NEBULA S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 10 NAME-STINGR WFC3/UVI ACCUM UVIS2-C51 F625W FLASH=12, CR-SPLIT=NO 1 22.5 S (90 AY-NEBULA S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 11 NAME-STINGR WFC3/UVI ACCUM UVIS2-C51 F438W FLASH=12, CR-SPLIT=NO, BLADE=A 1 1 S (4 S) AY-NEBULA S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 12 NAME-STINGR WFC3/UVI ACCUM UVIS2-C51 F438W CR-SPLIT=NO, FLASH=12 1 30 S (120 AY-NEBULA S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 14126( 3) - 23-Jul-2015 21:29:42 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NAME-STINGRAY-NEBUL 1 WFC3/UVI ACCUM UVIS2-C5 F502N 1 none none none 1 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 1 WFC3/UVI ACCUM UVIS2-C5 F502N 2 none none none 1 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 1 WFC3/UVI ACCUM UVIS2-C5 F502N 3 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 1 WFC3/UVI ACCUM UVIS2-C5 F502N 4 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 2 WFC3/UVI ACCUM UVIS2-C5 F502N 1 none none none 1 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 2 WFC3/UVI ACCUM UVIS2-C5 F502N 2 none none none 1 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 2 WFC3/UVI ACCUM UVIS2-C5 F502N 3 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 2 WFC3/UVI ACCUM UVIS2-C5 F502N 4 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 3 WFC3/UVI ACCUM UVIS2-C5 F487N 1 none none none 1 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 3 WFC3/UVI ACCUM UVIS2-C5 F487N 2 none none none 1 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 3 WFC3/UVI ACCUM UVIS2-C5 F487N 3 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 3 WFC3/UVI ACCUM UVIS2-C5 F487N 4 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 4 WFC3/UVI ACCUM UVIS2-C5 F658N 1 none none none 1 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 4 WFC3/UVI ACCUM UVIS2-C5 F658N 2 none none none 1 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 4 WFC3/UVI ACCUM UVIS2-C5 F658N 3 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 4 WFC3/UVI ACCUM UVIS2-C5 F658N 4 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 5 WFC3/UVI ACCUM UVIS2-C5 F656N 1 none none none 1 68.0 S A S 12C-SUB NAME-STINGRAY-NEBUL 5 WFC3/UVI ACCUM UVIS2-C5 F656N 2 none none none 1 68.0 S A S 12C-SUB NAME-STINGRAY-NEBUL 5 WFC3/UVI ACCUM UVIS2-C5 F656N 3 none none none 2 123.0 S A S 12C-SUB NAME-STINGRAY-NEBUL 5 WFC3/UVI ACCUM UVIS2-C5 F656N 4 none none none 2 123.0 S A S 12C-SUB NAME-STINGRAY-NEBUL 6 WFC3/UVI ACCUM UVIS2-C5 F673N 1 none none none 1 N/A A S 12C-SUB 14126( 3) - 23-Jul-2015 21:29:42 - [ 7] 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 | ------------------------------------------------------------------------------------------------------------------------------------ NAME-STINGRAY-NEBUL 6 WFC3/UVI ACCUM UVIS2-C5 F673N 2 none none none 1 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 6 WFC3/UVI ACCUM UVIS2-C5 F673N 3 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 6 WFC3/UVI ACCUM UVIS2-C5 F673N 4 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 7 WFC3/UVI ACCUM UVIS2-C5 F555W 1 none none none 1 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 7 WFC3/UVI ACCUM UVIS2-C5 F555W 2 none none none 1 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 7 WFC3/UVI ACCUM UVIS2-C5 F555W 3 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 7 WFC3/UVI ACCUM UVIS2-C5 F555W 4 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 8 WFC3/UVI ACCUM UVIS2-C5 F555W 1 none none none 1 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 8 WFC3/UVI ACCUM UVIS2-C5 F555W 2 none none none 1 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 8 WFC3/UVI ACCUM UVIS2-C5 F555W 3 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 8 WFC3/UVI ACCUM UVIS2-C5 F555W 4 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 9 WFC3/UVI ACCUM UVIS2-C5 F625W 1 none none none 1 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 9 WFC3/UVI ACCUM UVIS2-C5 F625W 2 none none none 1 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 9 WFC3/UVI ACCUM UVIS2-C5 F625W 3 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 9 WFC3/UVI ACCUM UVIS2-C5 F625W 4 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 10 WFC3/UVI ACCUM UVIS2-C5 F625W 1 none none none 1 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 10 WFC3/UVI ACCUM UVIS2-C5 F625W 2 none none none 1 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 10 WFC3/UVI ACCUM UVIS2-C5 F625W 3 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 10 WFC3/UVI ACCUM UVIS2-C5 F625W 4 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 11 WFC3/UVI ACCUM UVIS2-C5 F438W 1 none none none 1 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 11 WFC3/UVI ACCUM UVIS2-C5 F438W 2 none none none 1 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 11 WFC3/UVI ACCUM UVIS2-C5 F438W 3 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 11 WFC3/UVI ACCUM UVIS2-C5 F438W 4 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 12 WFC3/UVI ACCUM UVIS2-C5 F438W 1 none none none 1 N/A A S 12C-SUB 14126( 3) - 23-Jul-2015 21:29:42 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NAME-STINGRAY-NEBUL 12 WFC3/UVI ACCUM UVIS2-C5 F438W 2 none none none 1 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 12 WFC3/UVI ACCUM UVIS2-C5 F438W 3 none none none 2 N/A A S 12C-SUB NAME-STINGRAY-NEBUL 12 WFC3/UVI ACCUM UVIS2-C5 F438W 4 none none none 2 N/A A S 12C-SUB 14126( 3) - 23-Jul-2015 21:29:42 - [ 9] Summary Form for Proposal 14126 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS2-C512C-SUB ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BLADE=A, CR-SPLIT=NO, FLASH=11, FLASH=12 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1-12 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F438W, F487N, F502N, F555W, F625W, F656N, F658N, F673N ------------------------------------------------------------------------------------------------------------------------------------ Target Names NAME-STINGRAY-NEBULA ------------------------------------------------------------------------------------------------------------------------------------