14794( 3) - 02-Dec-2016 17:03:06 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14794 Version: 3 Check-in Time: 02-Dec-2016 17:03:06 STScI Edit Number: 0 Title Planetary Nebulae in the Open Clusters of M31 ------------------------------------------------------------------------------------ Type Cycle GO 24 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Howard E. Bond The Pennsylvania State University Y CoI: Dr. Robin Ciardullo The Pennsylvania State University N CoI: Dr. George Jacoby Lowell Observatory N ------------------------------------------------------------------------------------ Abstract Most planetary nebulae (PNe) are field objects. Precious little is known about their progenitor stars' properties and how they relate to those of the PN. The lone exceptions are the very rare cases where a PN is a member of an open star cluster. Then one can determine the ages, masses, and compositions of the progenitors, providing direct tests of stellar-evolution theory. We have recently discovered three PNe belonging to open clusters in M31, the Andromeda Galaxy. Here we propose a set of HST follow-up investigations. For the PN in the M31 cluster B477-D075, we know its precise location, and there are excellent photometric data (from the M31 PHAT project) that establish the host cluster's age (350 Myr) and the mass of the PN progenitor star (3.35 Msun). We will use STIS spectroscopy in the UV and optical to measure He, CNO, and alpha-process abundances in the nebula, based on emission-line fluxes and a photoionization code. Our primary aim is to compare the measured abundances with predictions of post-AGB evolution theory. In particular, "hot-bottom burning" is expected to produce enhanced He/H and N/O abundances when the progenitor star is sufficiently massive, but it is uncertain whether this occurs at masses as low as ~3 Msun, or requires masses of at least ~5 Msun. Thus our observations will provide key new constraints on AGB evolution of intermediate-mass stars. For two other M31 clusters, B458-D049 and SK044A, whose integrated-light spectra show that a PN is present, we will use WFC3 with an [O III] filter to verify the presence of the PNe, and determine their precise astrometric locations. We will then follow up with STIS spectroscopy in a future HST 14794( 3) - 02-Dec-2016 17:03:06 - [ 2] Cycle. ------------------------------------------------------------------------------------ Observations Description ------------------------ This program has 3 targets. For one of the targets we will obtain long-slit spectra with STIS. For the other two, we will obtain direct images with WFC3. 1. STIS: The target is a planetary nebula in the M31 open cluster B477-D075. Since the PN itself is very faint, we do an acquisition on a nearby, brighter star. We have measured the offset from this star to the PN using narrow-band ACS images that show both the star and the PN. Following the acquisition and offset maneuver, we use 4 HST orbits to obtain STIS spectra with the low-resolution gratings. We dither along the slit for these observations. 2. WFC3: For the open clusters B458-D049 and SK044A, each of which is known from ground-based integrated spectra to contain a PN, we will obtain direct images in order to precisely locate the PN (for follow-up STIS spectroscopy in a future cycle). We will obtain a narrow-band F502N image ([O III]), along with a broad-band V (F555W) image. Image subtraction will clearly identify the PN. We will also obtain images in I (F814W) in order to obtain an improved color-magnitude diagram for each cluster. ------------------------------------------------------------------------------------ 14794( 3) - 02-Dec-2016 17:03:06 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 M31-B477-OFF UNIDENTIFIED, OPTICAL RA=00H45M8.2954S +/- 0.1", J2000 V = 22 SET EMITTER DEC=+41D39'48.39" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 2 M31-B477-D07 EXT-MEDIUM, EJECTA, RA-OFF=+0.1100S, J2000 V = 22 5-PN EMISSION LINE NEBULA, DEC-OFF=-9.969", FROM 1 PLANETARY NEBULA ------------------------------------------------------------------------------------------------------------------------------------ 3 M31-B458-D04 STELLAR CLUSTER, RA=00H41M44.5900S +/- 0.5", J2000 V = 25 9 EMISSION LINE NEBULA, DEC=+40D51'22.90" +/- 0.5" OPEN CLUSTER Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 4 M31-SK044A STELLAR CLUSTER, RA=00H42M6.3200S, J2000 V = 26.1 EMISSION LINE NEBULA, DEC=+40D53'16.60" OPEN CLUSTER Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 14794( 3) - 02-Dec-2016 17:03:06 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE-3PT Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.135 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type STIS-ALONG-SLIT Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.40624 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 90.0 Angle_Between_Sides Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type STIS-ALONG-SLIT Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.40624 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 90.0 Angle_Between_Sides Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 4 Primary_Pattern Secondary_Pattern Pattern_Type STIS-ALONG-SLIT Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.3952 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 90.0 Angle_Between_Sides Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ 14794( 3) - 02-Dec-2016 17:03:06 - [ 5] Visit: 02 (WFC3-M31-B458) 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 M31-B458-D0 WFC3/UVI ACCUM UVIS2-C51 F502N CR-SPLIT=NO, FLASH=8 1 450 S PATTERN 1 1-3 49 S 2C-SUB (1350 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 M31-B458-D0 WFC3/UVI ACCUM UVIS2-C51 F555W CR-SPLIT=NO, FLASH=6 1 175 S (525 49 S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 3 M31-B458-D0 WFC3/UVI ACCUM UVIS2-C51 F814W CR-SPLIT=NO 1 150 S (450 49 S 2C-SUB 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 | ------------------------------------------------------------------------------------------------------------------------------------ M31-B458-D049 1 WFC3/UVI ACCUM UVIS2-C5 F502N 1 none none none 1 N/A S 12C-SUB M31-B458-D049 1 WFC3/UVI ACCUM UVIS2-C5 F502N 2 none none none 1 N/A S 12C-SUB M31-B458-D049 1 WFC3/UVI ACCUM UVIS2-C5 F502N 3 none none none 1 N/A S 12C-SUB M31-B458-D049 2 WFC3/UVI ACCUM UVIS2-C5 F555W 1 none none none 1 N/A S 12C-SUB M31-B458-D049 2 WFC3/UVI ACCUM UVIS2-C5 F555W 2 none none none 1 N/A S 12C-SUB M31-B458-D049 2 WFC3/UVI ACCUM UVIS2-C5 F555W 3 none none none 1 N/A S 12C-SUB M31-B458-D049 3 WFC3/UVI ACCUM UVIS2-C5 F814W 1 none none none 1 N/A S 12C-SUB M31-B458-D049 3 WFC3/UVI ACCUM UVIS2-C5 F814W 2 none none none 1 N/A S 12C-SUB M31-B458-D049 3 WFC3/UVI ACCUM UVIS2-C5 F814W 3 none none none 1 N/A S 12C-SUB 14794( 3) - 02-Dec-2016 17:03:06 - [ 6] Visit: 03 (WFC3-M31-SK044A) 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 M31-SK044A WFC3/UVI ACCUM UVIS2-C51 F502N CR-SPLIT=NO, FLASH=8 1 450 S PATTERN 1 1-3 S 2C-SUB (1350 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 M31-SK044A WFC3/UVI ACCUM UVIS2-C51 F555W CR-SPLIT=NO, FLASH=6 1 175 S (525 S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 3 M31-SK044A WFC3/UVI ACCUM UVIS2-C51 F814W CR-SPLIT=NO 1 150 S (450 S 2C-SUB 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 | ------------------------------------------------------------------------------------------------------------------------------------ M31-SK044A 1 WFC3/UVI ACCUM UVIS2-C5 F502N 1 none none none 1 N/A S 12C-SUB M31-SK044A 1 WFC3/UVI ACCUM UVIS2-C5 F502N 2 none none none 1 N/A S 12C-SUB M31-SK044A 1 WFC3/UVI ACCUM UVIS2-C5 F502N 3 none none none 1 N/A S 12C-SUB M31-SK044A 2 WFC3/UVI ACCUM UVIS2-C5 F555W 1 none none none 1 N/A S 12C-SUB M31-SK044A 2 WFC3/UVI ACCUM UVIS2-C5 F555W 2 none none none 1 N/A S 12C-SUB M31-SK044A 2 WFC3/UVI ACCUM UVIS2-C5 F555W 3 none none none 1 N/A S 12C-SUB M31-SK044A 3 WFC3/UVI ACCUM UVIS2-C5 F814W 1 none none none 1 N/A S 12C-SUB M31-SK044A 3 WFC3/UVI ACCUM UVIS2-C5 F814W 2 none none none 1 N/A S 12C-SUB M31-SK044A 3 WFC3/UVI ACCUM UVIS2-C5 F814W 3 none none none 1 N/A S 12C-SUB 14794( 3) - 02-Dec-2016 17:03:06 - [ 7] Visit: 04 (STIS-CCD-M31-B477-PN) 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 M31-B477-OF STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 120 S (120 FSET S) ------------------------------------------------------------------------------------------------------------------------------------ 2 M31-B477-D0 STIS/CCD ACCUM 52X0.5E1 G750L 7751 CR-SPLIT=NO, GAIN=1 1 615 S PATTERN 2 2 75-PN (1845 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 CCDFLAT STIS/CCD ACCUM 52X0.1 G750L 7751 2 DEF (0 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 M31-B477-D0 STIS/CCD ACCUM 52X0.5E1 G430L 4300 CR-SPLIT=NO, GAIN=1 1 690 S PATTERN 3 4 75-PN (2760 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 | ------------------------------------------------------------------------------------------------------------------------------------ M31-B477-OFFSET 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A M31-B477-D075-PN 2 STIS/CCD ACCUM 52X0.5E1 G750L 7751 1 none none none 1 N/A M31-B477-D075-PN 2 STIS/CCD ACCUM 52X0.5E1 G750L 7751 2 none none none 1 N/A M31-B477-D075-PN 2 STIS/CCD ACCUM 52X0.5E1 G750L 7751 3 none none none 1 N/A CCDFLAT 3 STIS/CCD ACCUM 52X0.1 G750L 7751 none none 1 none 1 N/A CCDFLAT 3 STIS/CCD ACCUM 52X0.1 G750L 7751 none none 2 none 1 N/A M31-B477-D075-PN 4 STIS/CCD ACCUM 52X0.5E1 G430L 4300 1 none none none 2 N/A M31-B477-D075-PN 4 STIS/CCD ACCUM 52X0.5E1 G430L 4300 2 none none none 2 N/A M31-B477-D075-PN 4 STIS/CCD ACCUM 52X0.5E1 G430L 4300 3 none none none 2 N/A M31-B477-D075-PN 4 STIS/CCD ACCUM 52X0.5E1 G430L 4300 4 none none none 2 N/A 14794( 3) - 02-Dec-2016 17:03:06 - [ 8] Visit: 05 (STIS-MAMA-M31-B477-PN) 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 M31-B477-OF STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 75 S (75 FSET S) ------------------------------------------------------------------------------------------------------------------------------------ 2 M31-B477-D0 STIS/NUV ACCUM 52X0.5 G230L 2376 1 1430 S PATTERN 4 2 75-PN -MAMA see below (2006 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 M31-B477-D0 STIS/FUV ACCUM 52X0.5D1 G140L 1425 1 1435 S PATTERN 4 3 75-PN -MAMA (2870 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 | ------------------------------------------------------------------------------------------------------------------------------------ M31-B477-OFFSET 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A M31-B477-D075-PN 2 STIS/NUV ACCUM 52X0.5 G230L 2376 1 none none none 1 1003.0 S -MAMA M31-B477-D075-PN 2 STIS/NUV ACCUM 52X0.5 G230L 2376 2 none none none 1 1003.0 S -MAMA M31-B477-D075-PN 3 STIS/FUV ACCUM 52X0.5D1 G140L 1425 1 none none none 2 N/A -MAMA M31-B477-D075-PN 3 STIS/FUV ACCUM 52X0.5D1 G140L 1425 2 none none none 2 N/A -MAMA 14794( 3) - 02-Dec-2016 17:03:06 - [ 9] Summary Form for Proposal 14794 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X0.1, 52X0.5, 52X0.5D1, 52X0.5E1, F28X50LP, UVIS2-C512C-SUB ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA, STIS/NUV-MAMA, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ACQTYPE=POINT, CR-SPLIT=NO, FLASH=6, FLASH=8, GAIN=1 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1-3, PATTERN 2 2, PATTERN 3 4, PATTERN 4 2, PATTERN 4 3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F502N, F555W, F814W, G140L, G230L, G430L, G750L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names CCDFLAT, M31-B458-D049, M31-B477-D075-PN, M31-B477-OFFSET, M31-SK044A ------------------------------------------------------------------------------------------------------------------------------------