12188( 5) - 26-Apr-2012 15:18:07 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12188 Version: 5 Check-in Time: 26-Apr-2012 15:18:07 STScI Edit Number: 1 Title Tests of Extreme Physics in Very Cool White Dwarfs ------------------------------------------------------------------------------------ Type Cycle GO 18 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Jay B. Holberg University of Arizona CoI: Dr. Didier Saumon Los Alamos National Laboratory N CoI: Dr. Piotr Kowalski Helmholtz Centre Potsdam N ------------------------------------------------------------------------------------ Abstract A program of low resolution Near UV STIS spectroscopy is proposed that will critically test new improved models of photospheric opacity in cool (Teff < 6000 K) DA and DC white dwarf stars. Such stars possess either weak or no Balmer lines from which spectroscopic information such as temperature, surface gravity and photospheric composition can be determined. These critical parameters must be estimated from fits to the overall Spectral Energy Distribution (SED), a method that is inherently less sensitive than spectroscopic methods. Our new models implement a detailed treatment of collisional perturbations to H atoms in cool dense WD photospheres that naturally account for an acknowledged missing opacity, due the red wing of the H I Lyman alpha transition. This in turn modifies the SED in the wavelength region from 2500 A to 4000 A. A full validation of these models over a significant range of temperature and gravity will greatly improve the analysis of the cool white dwarfs and provide new insights into atmospheric compositions, cooling ages, and luminosities of this important component of the white dwarf population. ------------------------------------------------------------------------------------ Observations Description ------------------------ This proposal will obtain single STIS observations of seven of our targets and two observations of the eighth and weakest target. All observations will use the STIS NUV MAMA with the G230L grating and the 52x2 slit since our observations are primarily spectrophotometric. All targets are cool white dwarf stars with spectral energy distributions that rapidly fall towards short wavelengths. We have simulated expected count rates and S/N for each target, using an appropriate model atmosphere and the STIS Spectroscopic ETC. Maximum signal levels are expected between 2800 A and 3000 A, with useful signals extending as short as 2400 A for the strongest targets. Our observations will be most sensitive to the NUV MAMA dark count. Real Time Justification ----------------------- Calibration Justification ------------------------- 12188( 5) - 26-Apr-2012 15:18:07 - [ 2] Additional Comments ------------------- ------------------------------------------------------------------------------------ 12188( 5) - 26-Apr-2012 15:18:07 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GJ3162 STAR, DC RA=02H32M37.9000S +/- 0.1", J2000 V = 15.76 +/- 0.03 DEC=-14D11'50.80" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.00233808031290225 -0.686 0.0646 ------------------------------------------------------------------------------------------------------------------------------------ 2 GJ3259 STAR, DC RA=04H00M26.6810S +/- 0.1", J2000 V = 15.87 +/- 0.03 DEC=+08D14'6.90" +/- 0.1" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -0.02425005947894466 -0.396 0.0567 ------------------------------------------------------------------------------------------------------------------------------------ 3 GJ3420 STAR, DC RA=07H00M51.6200S +/- 0.1", J2000 V = 16.56 +/- 0.03 DEC=+31D57'45.00" +/- 0.1" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.027031441962326014 -0.6 0.0536 ------------------------------------------------------------------------------------------------------------------------------------ 4 GJ1102B STAR, DC RA=07H50M14.5800S +/- 0.1", J2000 V = 16.98 +/- 0.03 DEC=+07D11'49.10" +/- 0.1" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0139095891584401 -1.793 0.0547 ------------------------------------------------------------------------------------------------------------------------------------ 5 GJ1102A STAR, DC RA=07H50M15.3400S +/- 0.1", J2000 V = 16.98 DEC=+07D11'37.30" +/- 0.1" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.013909488699311861 -1.793 0.0547 ------------------------------------------------------------------------------------------------------------------------------------ 6 GJ3866 STAR, DC RA=14H47M25.4800S +/- 0.1", J2000 V = 16.44 +/- 0.03 DEC=-17D42'15.20" +/- 0.1" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -0.0764192882592756 -0.341 0.0690 ------------------------------------------------------------------------------------------------------------------------------------ 12188( 5) - 26-Apr-2012 15:18:07 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 7 GJ4054 STAR, DA RA=18H21M19.8300S +/- 0.1", J2000 V = 15.69 +/- 0.03 DEC=+61D01'7.90" +/- 0.1" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.019538169440541292 -0.699 0.0781 ------------------------------------------------------------------------------------------------------------------------------------ 8 GJ812B STAR, DC RA=20H56M47.7200S +/- 0.1", J2000 V = 16.67 +/- 0.03 DEC=-04D50'39.50" +/- 0.1" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.05266947633435147 -0.21869 0.05656 ------------------------------------------------------------------------------------------------------------------------------------ 12188( 5) - 26-Apr-2012 15:18:07 - [ 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GJ3162 STIS/CCD ACQ F28X50LP MIRROR 1 1.1 S ------------------------------------------------------------------------------------------------------------------------------------ 2 GJ3162 STIS/NUV ACCUM 52X2 G230L 2376 1 2000 S -MAMA see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GJ3162 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A GJ3162 2 STIS/NUV ACCUM 52X2 G230L 2376 none none none none 1 2379.0 S -MAMA 12188( 5) - 26-Apr-2012 15:18:07 - [ 6] 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GJ3259 STIS/CCD ACQ F28X50LP MIRROR 1 1.3 S ------------------------------------------------------------------------------------------------------------------------------------ 2 GJ3259 STIS/NUV ACCUM 52X2 G230L 2376 1 2000 S -MAMA see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GJ3259 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A GJ3259 2 STIS/NUV ACCUM 52X2 G230L 2376 none none none none 1 2376.0 S -MAMA 12188( 5) - 26-Apr-2012 15:18:07 - [ 7] Visit: 04 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GJ1102B STIS/CCD ACQ F28X50LP MIRROR 1 1.23 S ------------------------------------------------------------------------------------------------------------------------------------ 2 GJ1102B STIS/CCD ACQ/PEA 52X0.1 G430L 4300 1 3.51 S K ------------------------------------------------------------------------------------------------------------------------------------ 3 GJ1102B STIS/NUV ACCUM 52X2 G230L 2376 1 2000 S -MAMA see below ------------------------------------------------------------------------------------------------------------------------------------ 4 GJ1102A STIS/NUV ACCUM 52X2 G230L 2376 1 2500 S POS TARG 11.293, -11.800 -MAMA see below Comments: Offset to second component of WD binary. ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GJ1102B 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A GJ1102B 2 STIS/CCD ACQ/PEA 52X0.1 G430L 4300 none none none none 1 N/A K GJ1102B 3 STIS/NUV ACCUM 52X2 G230L 2376 none none none none 1 1995.0 S -MAMA GJ1102A 4 STIS/NUV ACCUM 52X2 G230L 2376 none none none none 2 2992.0 S -MAMA 12188( 5) - 26-Apr-2012 15:18:07 - [ 8] Visit: 06 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GJ3866 STIS/CCD ACQ F28X50LP MIRROR 1 2.8 S ------------------------------------------------------------------------------------------------------------------------------------ 2 GJ3866 STIS/NUV ACCUM 52X2 G230L 2376 1 2000 S -MAMA see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GJ3866 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A GJ3866 2 STIS/NUV ACCUM 52X2 G230L 2376 none none none none 1 2377.0 S -MAMA 12188( 5) - 26-Apr-2012 15:18:07 - [ 9] Visit: 07 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GJ4054 STIS/CCD ACQ F28X50LP MIRROR 1 1.3 S ------------------------------------------------------------------------------------------------------------------------------------ 2 GJ4054 STIS/NUV ACCUM 52X2 G230L 2376 1 2000 S -MAMA see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GJ4054 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A GJ4054 2 STIS/NUV ACCUM 52X2 G230L 2376 none none none none 1 2650.0 S -MAMA 12188( 5) - 26-Apr-2012 15:18:07 - [ 10] Visit: 08 Visit Requirements: ORIENT 105D TO 255 D; ORIENT 285D TO 75 D On Hold Comments: Additional Comments: This avoids having the dMe companion in the slit. The position angle of the companion is 135D, so slit orientations of 135+/- 15D and 315 +/- 15D are to be avoided. The corresponding permitted U3 orientations are 285D to 75D and 105D to 255D. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GJ812B STIS/CCD ACQ F28X50LP MIRROR 1 3.2 S ------------------------------------------------------------------------------------------------------------------------------------ 2 GJ812B STIS/NUV ACCUM 52X2 G230L 2376 1 2000 S -MAMA see below ------------------------------------------------------------------------------------------------------------------------------------ 3 GJ812B STIS/NUV ACCUM 52X2 G230L 2376 1 2900 S -MAMA see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GJ812B 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A GJ812B 2 STIS/NUV ACCUM 52X2 G230L 2376 none none none none 1 2360.0 S -MAMA GJ812B 3 STIS/NUV ACCUM 52X2 G230L 2376 none none none none 2 2959.0 S -MAMA 12188( 5) - 26-Apr-2012 15:18:07 - [ 11] Visit: 09 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GJ3420 STIS/CCD ACQ F28X50LP MIRROR 1 3.6 S ------------------------------------------------------------------------------------------------------------------------------------ 2 GJ3420 STIS/NUV ACCUM 52X2 G230L 2376 1 2035 S -MAMA see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GJ3420 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A GJ3420 2 STIS/NUV ACCUM 52X2 G230L 2376 none none none none 1 2399.0 S -MAMA 12188( 5) - 26-Apr-2012 15:18:07 - [ 12] Summary Form for Proposal 12188 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X0.1, 52X2, F28X50LP ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, ACQ/PEAK ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 105D TO 255 D, ORIENT 285D TO 75 D, POS TARG 11.293, -11.800 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G230L, G430L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names GJ1102A, GJ1102B, GJ3162, GJ3259, GJ3420, GJ3866, GJ4054, GJ812B ------------------------------------------------------------------------------------------------------------------------------------