17574( 3) - 11-Jun-2024 21:55:36 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17574 Version: 3 Check-in Time: 11-Jun-2024 21:55:36 STScI Edit Number: 1 Title Spin Me Right Round: Testing Accretion Spin-up in Wide Binary Main-Sequence Carbon Stars ------------------------------------------------------------------------------------ Type Cycle GO 31 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Benjamin R Roulston Clarkson University Y CoI: Dr. Paul J. Green Smithsonian Institution Astrophysical N Observatory CoI: Dr. Rodolfo Montez Jr. Smithsonian Institution Astrophysical N Observatory CoI: Dr. Jeremy J. Drake Lockheed Martin Space N CoI: Prof. Scott F. Anderson University of Washington N ------------------------------------------------------------------------------------ Abstract The dwarf carbon stars are a class of post-mass transfer binaries that have accreted a significant amount of C-rich mass and angular momentum from a former AGB companion (now a white dwarf, usually undetected in the optical). We aim to use these dwarf carbon stars to better understand the physics behind mass and angular momentum transfer in binary systems, and the resulting spin-up and activity lifetimes of rejuvenated dwarfs. We propose to use joint Chandra+HST observations of 5 nearby dwarf carbon stars in wide binary systems to (1) probe the dC X-ray magnetic activity and diagnose mass-transfer spin-up, (2) constrain the coronal temperature of the dC, and (3) assess the remnant white dwarf companion cooling age through UV photometry. ------------------------------------------------------------------------------------ Observations Description ------------------------ We plan observations of 3 interesting dwarf carbon (dC) stars, utilizing both the ACS-SBC and WFC3-UVIS detectors. This will allow us to obtain stronger UV constraints than allowed by the 1 weak GALEX NUV detection. The dCs must have (from an evolutionary perspective) a WD component. Since no WD features are evident in the optical spectrum the WD must be relatively cool, implying Gyr since its AGB phase. We seek to detect and constrain its age using these NUV and FUV HST observations. The WFC3 ETC predcits (assuming WD T=3000K): HE 2115-0709 -- S/N=14.5 in the NUV with UVIS+[F225W] in 2333s LP 758-43 -- S/N=17.0 in the NUV with UVIS+[F225W] in 2334s LP 225-12 -- S/N=11.0 in the NUV with UVIS+[F225W] in 2414s For the UVIS observations we include a post-FLASH of 15e to aid with CTE issues as recommended. For the UVIS observations we utilize a BOX dither. The UVIS observations pass saturation checks with the BOT and GSC2. 17574( 3) - 11-Jun-2024 21:55:36 - [ 2] The ACS ETC predicts (assuming WD T=4500K): HE 2115-0709 -- S/N= 3.5 in the FUV with SBC+[F140LP] in 2482s LP 758-43 -- S/N= 4.0 in the FUV with SBC+[F140LP] in 2483s LP 225-12 -- S/N= 2.7 in the FUV with SBC+[F140LP] in 2545s HE 2115-0709 -- S/N= 6.3 in the FUV with SBC+[F165LP] in 2496s LP 758-43 -- S/N= 7.0 in the FUV with SBC+[F165LP] in 2497s LP 225-12 -- S/N= 5.4 in the FUV with SBC+[F165LP] in 2577s For the FUV observations, we use both the [F140LP] and [F165LP] filters in order to account for the red leak of the SBC as recommneded. The SBC observation passes the BOT using the GALEX catalog with all SAFE objects. For the SBC observations we utilize a BOX dither. ------------------------------------------------------------------------------------ 17574( 3) - 11-Jun-2024 21:55:36 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HE-2115-0709 STAR, CARBON STAR, RA=21H17M42.1969S +/- J2000 V = 16.2 B=17.88, J=12.673, H=12.0, COMPOSITE SPECTRAL 0.00014093731", K=11.808, G=14.81, BP=15.69 RP=13.90 TYPE, DA DEC=-06D57'11.86" +/- 0.00011563963" Reference Frame: ICRS Extended: NO Comments: This object was matched into Gaia DR3. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2016.0 0.003703973764873826 -0.04506193506897677 0.005714750374423056 ------------------------------------------------------------------------------------------------------------------------------------ 2 LP-758-43 STAR, CARBON STAR, RA=21H49M38.1564S +/- J2000 V = 15.97 J=13.0, H=12.26, K=11.90, COMPOSITE SPECTRAL 0.00009722284", G=15.12, BP=16.08, RP=14.12 TYPE, DA DEC=-11D38'28.40" +/- 0.00008462605" Reference Frame: ICRS Extended: NO Comments: This object was matched into Gaia DR3. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2016.0 0.01773877743506485 -0.0029346540996493878 0.006723484031388449 ------------------------------------------------------------------------------------------------------------------------------------ 3 LP-225-12 STAR, CARBON STAR, RA=16H22M32.7158S +/- J2000 V = 16.5 +/- 0.5 GALEX NUV=19.5931, COMPOSITE SPECTRAL 0.00016935606", B=17.2, R=15.1, G=15.52, BP=16.42, TYPE, DA DEC=+42D37'56.42" +/- RP=14.59 0.00019040398" Reference Frame: ICRS Extended: NO Comments: This object was matched into Gaia DR3. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2016.0 -0.009546074176622723 0.1469109540652787 0.0079002798022676055 ------------------------------------------------------------------------------------------------------------------------------------ 17574( 3) - 11-Jun-2024 21:55:36 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type ACS-SBC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.179 Line_Spacing 0.116 Coordinate_Frame POS-TARG Pattern_Orient 20.02 Angle_Between_Sides 63.65 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 17574( 3) - 11-Jun-2024 21:55:36 - [ 5] Visit: 01 (HE 2115-0709) 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 HE-2115-070 WFC3/UVI ACCUM UVIS2 F225W FLASH=15.0 1 2327 S PATTERN 1 1 9 S see below (2209 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HE-2115-070 ACS/SBC ACCUM SBC F140LP 1 2482 S PATTERN 2 2 9 see below (2366 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HE-2115-070 ACS/SBC ACCUM SBC F165LP 1 2496 S PATTERN 2 3 9 see below (2360 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 | ------------------------------------------------------------------------------------------------------------------------------------ HE-2115-0709 1 WFC3/UVI ACCUM UVIS2 F225W 1 none none none 1 552.0 S S HE-2115-0709 1 WFC3/UVI ACCUM UVIS2 F225W 2 none none none 1 552.0 S S HE-2115-0709 1 WFC3/UVI ACCUM UVIS2 F225W 3 none none none 1 552.0 S S HE-2115-0709 1 WFC3/UVI ACCUM UVIS2 F225W 4 none none none 1 553.0 S S HE-2115-0709 2 ACS/SBC ACCUM SBC F140LP 1 none none none 2 591.0 S HE-2115-0709 2 ACS/SBC ACCUM SBC F140LP 2 none none none 2 591.0 S HE-2115-0709 2 ACS/SBC ACCUM SBC F140LP 3 none none none 2 592.0 S HE-2115-0709 2 ACS/SBC ACCUM SBC F140LP 4 none none none 2 592.0 S HE-2115-0709 3 ACS/SBC ACCUM SBC F165LP 1 none none none 3 590.0 S HE-2115-0709 3 ACS/SBC ACCUM SBC F165LP 2 none none none 3 590.0 S HE-2115-0709 3 ACS/SBC ACCUM SBC F165LP 3 none none none 3 590.0 S HE-2115-0709 3 ACS/SBC ACCUM SBC F165LP 4 none none none 3 590.0 S 17574( 3) - 11-Jun-2024 21:55:36 - [ 6] Visit: 02 (LP 758-43) 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 LP-758-43 WFC3/UVI ACCUM UVIS2 F225W FLASH=15.0 1 2327 S PATTERN 1 1 S see below (2214 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 LP-758-43 ACS/SBC ACCUM SBC F140LP 1 2482 S PATTERN 2 2 see below (2371 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 LP-758-43 ACS/SBC ACCUM SBC F165LP 1 2496 S PATTERN 2 3 see below (2365 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 | ------------------------------------------------------------------------------------------------------------------------------------ LP-758-43 1 WFC3/UVI ACCUM UVIS2 F225W 1 none none none 1 553.0 S S LP-758-43 1 WFC3/UVI ACCUM UVIS2 F225W 2 none none none 1 553.0 S S LP-758-43 1 WFC3/UVI ACCUM UVIS2 F225W 3 none none none 1 554.0 S S LP-758-43 1 WFC3/UVI ACCUM UVIS2 F225W 4 none none none 1 554.0 S S LP-758-43 2 ACS/SBC ACCUM SBC F140LP 1 none none none 2 592.0 S LP-758-43 2 ACS/SBC ACCUM SBC F140LP 2 none none none 2 593.0 S LP-758-43 2 ACS/SBC ACCUM SBC F140LP 3 none none none 2 593.0 S LP-758-43 2 ACS/SBC ACCUM SBC F140LP 4 none none none 2 593.0 S LP-758-43 3 ACS/SBC ACCUM SBC F165LP 1 none none none 3 591.0 S LP-758-43 3 ACS/SBC ACCUM SBC F165LP 2 none none none 3 591.0 S LP-758-43 3 ACS/SBC ACCUM SBC F165LP 3 none none none 3 591.0 S LP-758-43 3 ACS/SBC ACCUM SBC F165LP 4 none none none 3 592.0 S 17574( 3) - 11-Jun-2024 21:55:36 - [ 7] Visit: 03 (LP 225-12) 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 LP-225-12 WFC3/UVI ACCUM UVIS2 F225W FLASH=15.0 1 2327 S PATTERN 1 1 S see below (2250 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 LP-225-12 ACS/SBC ACCUM SBC F140LP 1 2482 S PATTERN 2 2 see below (2407 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 LP-225-12 ACS/SBC ACCUM SBC F165LP 1 2496 S PATTERN 2 3 see below (2401 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 | ------------------------------------------------------------------------------------------------------------------------------------ LP-225-12 1 WFC3/UVI ACCUM UVIS2 F225W 1 none none none 1 562.0 S S LP-225-12 1 WFC3/UVI ACCUM UVIS2 F225W 2 none none none 1 562.0 S S LP-225-12 1 WFC3/UVI ACCUM UVIS2 F225W 3 none none none 1 563.0 S S LP-225-12 1 WFC3/UVI ACCUM UVIS2 F225W 4 none none none 1 563.0 S S LP-225-12 2 ACS/SBC ACCUM SBC F140LP 1 none none none 2 601.0 S LP-225-12 2 ACS/SBC ACCUM SBC F140LP 2 none none none 2 602.0 S LP-225-12 2 ACS/SBC ACCUM SBC F140LP 3 none none none 2 602.0 S LP-225-12 2 ACS/SBC ACCUM SBC F140LP 4 none none none 2 602.0 S LP-225-12 3 ACS/SBC ACCUM SBC F165LP 1 none none none 3 600.0 S LP-225-12 3 ACS/SBC ACCUM SBC F165LP 2 none none none 3 600.0 S LP-225-12 3 ACS/SBC ACCUM SBC F165LP 3 none none none 3 600.0 S LP-225-12 3 ACS/SBC ACCUM SBC F165LP 4 none none none 3 601.0 S 17574( 3) - 11-Jun-2024 21:55:36 - [ 8] Summary Form for Proposal 17574 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures SBC, UVIS2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/SBC, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=15.0 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 2 2, PATTERN 2 3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F140LP, F165LP, F225W ------------------------------------------------------------------------------------------------------------------------------------ Target Names HE-2115-0709, LP-225-12, LP-758-43 ------------------------------------------------------------------------------------------------------------------------------------