13469( 7) - 19-Feb-2014 19:41:04 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13469 Version: 7 Check-in Time: 19-Feb-2014 19:41:04 STScI Edit Number: 0 Title Tol 26 and the EGB 6 Class of Planetary-Nebula Nuclei: What Happens to a Companion Star when a PN is Ejected? ------------------------------------------------------------------------------------ Type Cycle GO 21 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Howard E. Bond The Pennsylvania State University Y CoI: Dr. Steven A Hawley University of Kansas N CoI: Dr. Reginald J. Dufour Rice University N CoI: Dr. Ulisse Munari Universita degli Studi di Padova N CoI: Dr. James Liebert University of Arizona N ------------------------------------------------------------------------------------ Abstract Tol 26 is a faint, compact, high-latitude planetary nebula (PN), little studied since its discovery in the 70's. Its nebular spectrum is unusual in having no [O II] or [N II], and strong [O III] 4363, indicating very high electron density. Tol 26 is unresolved from the ground. GALEX, BVRI, 2MASS, and WISE data reveal: a bright UV source, which we identify as the central star; optical flux consistent with a dK companion, and NIR and MIR excesses indicating the presence of warm dust with two distinct temperatures. Tol 26 resembles the formerly unique EGB 6, a faint PN with a compact nucleus, also containing a hot white dwarf (WD) and dual-temperature dust. EGB 6 has a close dM companion; HST imaging shows that the compact nebula coincides with the dM star, not the WD. We speculate that a portion of the outflow during PN ejection created an accretion disk around the dM star, which has survived to the present time, and is ionized by the WD's UV flux. We propose WFC3 imaging of Tol 26, using filters that will separately isolate the hot central star, nebular emission, and the optical and NIR fluxes. We will determine whether there is likewise a resolved companion star in this system, and if so whether the nebular emission comes from an accreted disk around the companion, as in EGB 6. We will also obtain a FUV spectrum of Tol 26, to determine the Teff/log g of the central star and search for accreted metals. Our study will have wider implications for the spin-up of companion stars of PN nuclei, formation of barium stars, and the nature of 24-micron excesses discovered in several hot WDs and PN central stars. We will also obtain new images of EGB 6, last imaged by HST in 1995. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will obtain WFC3 images of two central stars of planetary nebulae, Tol 26 and EGB 6, with the main aim of determining the spatial locations of (a) the hot central star, (b) a cool companion star that is resolved from the hot star in EGB 6 and possibly in Tol 26, (c) compact ionized nebulae, possibly associated with the cool companions, and (d) warm dust. A range of WFC3 filters from the NUV, to the optical (including narrow-band filters), and the NIR will be used to sort out these components. 13469( 7) - 19-Feb-2014 19:41:04 - [ 2] We will also obtain a COS FUV spectrum of Tol 26, for the purpose of determining atmospheric parameters of the hot stellar component. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 13469( 7) - 19-Feb-2014 19:41:04 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 TOL26 STAR, PLANETARY NEBULA RA=12H33M12.9800S +/- 0.1", J2000 V = 15.5 CENTRAL STAR DEC=-27D48'53.40" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 2 EGB6 STAR, PLANETARY NEBULA RA=09H52M59.0000S +/- 0.1", J2000 V = 16.0 CENTRAL STAR DEC=+13D44'35.00" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 3 TOL26-UPDATE STAR, PLANETARY NEBULA RA=12H33M12.9769S +/- 0.1", J2000 V = 15.5 D CENTRAL STAR DEC=-27D48'53.14" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 13469( 7) - 19-Feb-2014 19:41:04 - [ 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 YES ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BOX-MIN Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.572 Line_Spacing 0.365 Coordinate_Frame POS-TARG Pattern_Orient 18.528 Angle_Between_Sides 74.653 Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 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 ------------------------------------------------------------------------------------------------------------------------------------ 13469( 7) - 19-Feb-2014 19:41:04 - [ 5] Visit: 01 Visit Requirements: ORIENT 283D TO 353 D; ORIENT 13D TO 38 D; ORIENT 58D TO 83 D; ORIENT 103D TO 173 D On Hold Comments: Additional Comments: ORIENT requirements are included because there is a bright star 25" away from the target. These requirements avoid either the charge bleeding columns or the diffraction spikes from the bright star interfering with the target. 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 TOL26 WFC3/UVI ACCUM UVIS2-C51 F225W CR-SPLIT=NO, FLASH=12, BLADE=A 1 12 S (48 PATTERN 1 1 S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 2 TOL26 WFC3/UVI ACCUM UVIS2-C51 F275W CR-SPLIT=NO, FLASH=12 1 15 S (60 PATTERN 1 2 S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 3 TOL26 WFC3/UVI ACCUM UVIS2-C51 F336W CR-SPLIT=NO, FLASH=12 1 20 S (80 PATTERN 1 3 S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 4 TOL26 WFC3/UVI ACCUM UVIS2-C51 F502N CR-SPLIT=NO, FLASH=12 1 30 S (120 PATTERN 1 4 S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 5 TOL26 WFC3/UVI ACCUM UVIS2-C51 F656N CR-SPLIT=NO, FLASH=12 1 20 S (80 PATTERN 1 5 S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 6 TOL26 WFC3/UVI ACCUM UVIS2-C51 F555W CR-SPLIT=NO, FLASH=12, BLADE=A 1 5 S (20 S) PATTERN 1 6 S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 7 TOL26 WFC3/UVI ACCUM UVIS2-C51 F814W CR-SPLIT=NO, FLASH=12, BLADE=A 1 5 S (20 S) PATTERN 1 7 S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 8 TOL26 WFC3/IR MULTIAC IRSUB128 F160W NSAMP=9, SAMP-SEQ=RAPID 1 DEF (4.057 PATTERN 2 8 CUM 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 | ------------------------------------------------------------------------------------------------------------------------------------ TOL26 1 WFC3/UVI ACCUM UVIS2-C5 F225W 1 none none none 1 N/A S 12C-SUB TOL26 1 WFC3/UVI ACCUM UVIS2-C5 F225W 2 none none none 1 N/A S 12C-SUB TOL26 1 WFC3/UVI ACCUM UVIS2-C5 F225W 3 none none none 1 N/A S 12C-SUB TOL26 1 WFC3/UVI ACCUM UVIS2-C5 F225W 4 none none none 1 N/A S 12C-SUB TOL26 2 WFC3/UVI ACCUM UVIS2-C5 F275W 1 none none none 1 N/A S 12C-SUB 13469( 7) - 19-Feb-2014 19:41:04 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ TOL26 2 WFC3/UVI ACCUM UVIS2-C5 F275W 2 none none none 1 N/A S 12C-SUB TOL26 2 WFC3/UVI ACCUM UVIS2-C5 F275W 3 none none none 1 N/A S 12C-SUB TOL26 2 WFC3/UVI ACCUM UVIS2-C5 F275W 4 none none none 1 N/A S 12C-SUB TOL26 3 WFC3/UVI ACCUM UVIS2-C5 F336W 1 none none none 1 N/A S 12C-SUB TOL26 3 WFC3/UVI ACCUM UVIS2-C5 F336W 2 none none none 1 N/A S 12C-SUB TOL26 3 WFC3/UVI ACCUM UVIS2-C5 F336W 3 none none none 1 N/A S 12C-SUB TOL26 3 WFC3/UVI ACCUM UVIS2-C5 F336W 4 none none none 1 N/A S 12C-SUB TOL26 4 WFC3/UVI ACCUM UVIS2-C5 F502N 1 none none none 1 N/A S 12C-SUB TOL26 4 WFC3/UVI ACCUM UVIS2-C5 F502N 2 none none none 1 N/A S 12C-SUB TOL26 4 WFC3/UVI ACCUM UVIS2-C5 F502N 3 none none none 1 N/A S 12C-SUB TOL26 4 WFC3/UVI ACCUM UVIS2-C5 F502N 4 none none none 1 N/A S 12C-SUB TOL26 5 WFC3/UVI ACCUM UVIS2-C5 F656N 1 none none none 1 N/A S 12C-SUB TOL26 5 WFC3/UVI ACCUM UVIS2-C5 F656N 2 none none none 1 N/A S 12C-SUB TOL26 5 WFC3/UVI ACCUM UVIS2-C5 F656N 3 none none none 1 N/A S 12C-SUB TOL26 5 WFC3/UVI ACCUM UVIS2-C5 F656N 4 none none none 1 N/A S 12C-SUB TOL26 6 WFC3/UVI ACCUM UVIS2-C5 F555W 1 none none none 1 N/A S 12C-SUB TOL26 6 WFC3/UVI ACCUM UVIS2-C5 F555W 2 none none none 1 N/A S 12C-SUB TOL26 6 WFC3/UVI ACCUM UVIS2-C5 F555W 3 none none none 1 N/A S 12C-SUB TOL26 6 WFC3/UVI ACCUM UVIS2-C5 F555W 4 none none none 1 N/A S 12C-SUB TOL26 7 WFC3/UVI ACCUM UVIS2-C5 F814W 1 none none none 1 N/A S 12C-SUB TOL26 7 WFC3/UVI ACCUM UVIS2-C5 F814W 2 none none none 1 N/A S 12C-SUB TOL26 7 WFC3/UVI ACCUM UVIS2-C5 F814W 3 none none none 1 N/A S 12C-SUB TOL26 7 WFC3/UVI ACCUM UVIS2-C5 F814W 4 none none none 1 N/A S 12C-SUB TOL26 8 WFC3/IR MULTIAC IRSUB128 F160W 1 none none none 1 N/A CUM 13469( 7) - 19-Feb-2014 19:41:04 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ TOL26 8 WFC3/IR MULTIAC IRSUB128 F160W 2 none none none 1 N/A CUM TOL26 8 WFC3/IR MULTIAC IRSUB128 F160W 3 none none none 1 N/A CUM TOL26 8 WFC3/IR MULTIAC IRSUB128 F160W 4 none none none 1 N/A CUM 13469( 7) - 19-Feb-2014 19:41:04 - [ 8] 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 EGB6 WFC3/UVI ACCUM UVIS2-C51 F225W CR-SPLIT=NO, FLASH=12, BLADE=A 1 5 S (15 S) PATTERN 3 1 S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 2 EGB6 WFC3/UVI ACCUM UVIS2-C51 F275W CR-SPLIT=NO, FLASH=12, BLADE=A 1 5 S (15 S) PATTERN 3 2 S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 3 EGB6 WFC3/UVI ACCUM UVIS2-C51 F336W CR-SPLIT=NO, FLASH=12, BLADE=A 1 5 S (15 S) PATTERN 3 3 S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 4 EGB6 WFC3/UVI ACCUM UVIS2-C51 F502N CR-SPLIT=NO, FLASH=12 1 120 S (360 PATTERN 3 4 S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 5 EGB6 WFC3/UVI ACCUM UVIS2-C51 F656N CR-SPLIT=NO, FLASH=12 1 240 S (720 PATTERN 3 5 S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 6 EGB6 WFC3/UVI ACCUM UVIS2-C51 F555W CR-SPLIT=NO, FLASH=12, BLADE=A 1 5 S (15 S) PATTERN 3 6 S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 7 EGB6 WFC3/UVI ACCUM UVIS2-C51 F814W CR-SPLIT=NO, FLASH=12, BLADE=A 1 10 S (30 PATTERN 3 7 S 2C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 8 EGB6 WFC3/IR MULTIAC IRSUB512 F160W NSAMP=6, SAMP-SEQ=RAPID 1 DEF PATTERN 2 8 CUM (20.473 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 | ------------------------------------------------------------------------------------------------------------------------------------ EGB6 1 WFC3/UVI ACCUM UVIS2-C5 F225W 1 none none none 1 N/A S 12C-SUB EGB6 1 WFC3/UVI ACCUM UVIS2-C5 F225W 2 none none none 1 N/A S 12C-SUB EGB6 1 WFC3/UVI ACCUM UVIS2-C5 F225W 3 none none none 1 N/A S 12C-SUB EGB6 2 WFC3/UVI ACCUM UVIS2-C5 F275W 1 none none none 1 N/A S 12C-SUB EGB6 2 WFC3/UVI ACCUM UVIS2-C5 F275W 2 none none none 1 N/A S 12C-SUB EGB6 2 WFC3/UVI ACCUM UVIS2-C5 F275W 3 none none none 1 N/A S 12C-SUB 13469( 7) - 19-Feb-2014 19:41:04 - [ 9] 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 | ------------------------------------------------------------------------------------------------------------------------------------ EGB6 3 WFC3/UVI ACCUM UVIS2-C5 F336W 1 none none none 1 N/A S 12C-SUB EGB6 3 WFC3/UVI ACCUM UVIS2-C5 F336W 2 none none none 1 N/A S 12C-SUB EGB6 3 WFC3/UVI ACCUM UVIS2-C5 F336W 3 none none none 1 N/A S 12C-SUB EGB6 4 WFC3/UVI ACCUM UVIS2-C5 F502N 1 none none none 1 N/A S 12C-SUB EGB6 4 WFC3/UVI ACCUM UVIS2-C5 F502N 2 none none none 1 N/A S 12C-SUB EGB6 4 WFC3/UVI ACCUM UVIS2-C5 F502N 3 none none none 1 N/A S 12C-SUB EGB6 5 WFC3/UVI ACCUM UVIS2-C5 F656N 1 none none none 1 N/A S 12C-SUB EGB6 5 WFC3/UVI ACCUM UVIS2-C5 F656N 2 none none none 1 N/A S 12C-SUB EGB6 5 WFC3/UVI ACCUM UVIS2-C5 F656N 3 none none none 1 N/A S 12C-SUB EGB6 6 WFC3/UVI ACCUM UVIS2-C5 F555W 1 none none none 1 N/A S 12C-SUB EGB6 6 WFC3/UVI ACCUM UVIS2-C5 F555W 2 none none none 1 N/A S 12C-SUB EGB6 6 WFC3/UVI ACCUM UVIS2-C5 F555W 3 none none none 1 N/A S 12C-SUB EGB6 7 WFC3/UVI ACCUM UVIS2-C5 F814W 1 none none none 1 N/A S 12C-SUB EGB6 7 WFC3/UVI ACCUM UVIS2-C5 F814W 2 none none none 1 N/A S 12C-SUB EGB6 7 WFC3/UVI ACCUM UVIS2-C5 F814W 3 none none none 1 N/A S 12C-SUB EGB6 8 WFC3/IR MULTIAC IRSUB512 F160W 1 none none none 1 N/A CUM EGB6 8 WFC3/IR MULTIAC IRSUB512 F160W 2 none none none 1 N/A CUM EGB6 8 WFC3/IR MULTIAC IRSUB512 F160W 3 none none none 1 N/A CUM EGB6 8 WFC3/IR MULTIAC IRSUB512 F160W 4 none none none 1 N/A CUM 13469( 7) - 19-Feb-2014 19:41:04 - [ 10] 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 TOL26-UPDAT COS/FUV ACQ/PEA PSA G140L 1105 1 5 S (5 S) ED KXD ------------------------------------------------------------------------------------------------------------------------------------ 2 TOL26-UPDAT COS/FUV ACQ/PEA PSA G140L 1105 NUM-POS=5, STEP-SIZE=0.9, 1 5 S (5 S) ED KD CENTER=FLUX-WT-FLR ------------------------------------------------------------------------------------------------------------------------------------ 3 TOL26-UPDAT COS/FUV TIME-TA PSA G140L 1105 BUFFER-TIME=1000, FLASH=YES, 1 100 S ED G FP-POS=ALL see below (2080 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 | ------------------------------------------------------------------------------------------------------------------------------------ TOL26-UPDATED 1 COS/FUV ACQ/PEA PSA G140L 1105 none none none none 1 N/A KXD TOL26-UPDATED 2 COS/FUV ACQ/PEA PSA G140L 1105 none none none none 1 N/A KD TOL26-UPDATED 3 COS/FUV TIME-TA PSA G140L 1105 none none none 1 1 520.0 S G TOL26-UPDATED 3 COS/FUV TIME-TA PSA G140L 1105 none none none 2 1 520.0 S G TOL26-UPDATED 3 COS/FUV TIME-TA PSA G140L 1105 none none none 3 1 520.0 S G TOL26-UPDATED 3 COS/FUV TIME-TA PSA G140L 1105 none none none 4 1 520.0 S G 13469( 7) - 19-Feb-2014 19:41:04 - [ 11] Summary Form for Proposal 13469 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IRSUB128, IRSUB512, PSA, UVIS2-C512C-SUB ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ/PEAKD, ACQ/PEAKXD, MULTIACCUM, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BLADE=A, BUFFER-TIME=1000, CENTER=FLUX-WT-FLR, CR-SPLIT=NO, FLASH=12, FLASH=YES, FP-POS=ALL, NSAMP=6, NSAMP=9, NUM-POS=5, SAMP-SEQ=RAPID, STEP-SIZE=0.9 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 103D TO 173 D, ORIENT 13D TO 38 D, ORIENT 283D TO 353 D, ORIENT 58D TO 83 D, PATTERN 1 1, PATTERN 1 2, PATTERN 1 3, PATTERN 1 4, PATTERN 1 5, PATTERN 1 6, PATTERN 1 7, PATTERN 2 8, PATTERN 3 1, PATTERN 3 2, PATTERN 3 3, PATTERN 3 4, PATTERN 3 5, PATTERN 3 6, PATTERN 3 7 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F160W, F225W, F275W, F336W, F502N, F555W, F656N, F814W, G140L ------------------------------------------------------------------------------------------------------------------------------------ Target Names EGB6, TOL26, TOL26-UPDATED ------------------------------------------------------------------------------------------------------------------------------------