14746( 2) - 01-Jul-2016 14:06:56 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14746 Version: 2 Check-in Time: 01-Jul-2016 14:06:56 STScI Edit Number: 0 Title Stellar Laboratories: High-precision Atomic Physics with STIS ------------------------------------------------------------------------------------ Type Cycle GO 24 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Thomas Rauch Eberhard Karls Universitat, Tubingen Y CoI: Ms. Lisa Loebling Eberhard Karls Universitat, Tubingen Y CoI: Prof. Klaus Werner Eberhard Karls Universitat, Tubingen N ------------------------------------------------------------------------------------ Abstract Stellar atmospheres are prime laboratories to determine atomic properties of highly ionized species. Since reliable metal opacities are crucial ingredients of many astrophysical simulations, we propose to exploit STIS's spectroscopic capabilities to obtain high-resolution, high-S/N spectra of three hot subdwarf stars that exhibit extremely high iron-group (calcium to nickel) abundances and, thus, are ideal objects to identify even weak spectral lines of these species. The precise spectral analysis by advanced non-LTE model-atmosphere techniques allows to determine photospheric properties accurately and subsequently derive relative weighted oscillator strengths of iron-group lines. This will establish an important benchmark test for available atomic-line lists of iron-group elements for ionization stages III to VI. ------------------------------------------------------------------------------------ Observations Description ------------------------ Short-slit (0.2"x0.2") medium-dispersion UV spectroscopy of three relatively bright , isolated sdOB stars in the STIS/FUV-MAMA configuration with grating E140M to cover the wavelength range 1150-1700 A. We used the STIS ETC (version 24.2) to determine the exposure times necessary to achieve S/N 30 - 50 in the complete wavelength range. From our experience with previous HST/STIS data analyses, this S/N is necessary for reliable line-profile analysis. To achieve the maximum S/N, we use the complete orbit. ------------------------------------------------------------------------------------ 14746( 2) - 01-Jul-2016 14:06:56 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 EC11481-2303 STAR, SDO RA=11H50M38.8484S +/- 0.01", J2000 V = V = 11.778 +/- 0.1 5.5E-12 DEC=-23D20'34.78" +/- 0.01" -17.5 erg/cm**2/s/A at 1300A from IUE SWP48111LL Reference Frame: ICRS Extended: NO 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 1.452196633313613E-4 -0.0099 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 2 FEIGE110 STAR, SDO RA=23H19M58.3981S +/- 0.01", J2000 V = 8.0 V = 11.845 +/- 0.1 7.2E-12 DEC=-05D09'56.16" +/- 0.01" erg/cm**2/s/A at 1300A from IUE SWP21891LL Reference Frame: ICRS Extended: NO 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 -7.149034844842737E-4 3.1E-4 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 3 PG0909+276 STAR, SDO RA=09H12M51.6620S +/- 0.01", J2000 V = 12.091 +/- 0.1 3.5E-12 DEC=+27D20'31.43" +/- 0.01" erg/cm**2/s/A at 1300A from IUE SWP27469LL Reference Frame: ICRS Extended: NO 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 3.752569352850871E-5 1.0E-4 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 14746( 2) - 01-Jul-2016 14:06:56 - [ 3] Visit: 01 (EC11481-2303) 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 EC11481-230 STIS/CCD ACQ F28X50OII MIRROR 1 1 S (1 S) 3 ------------------------------------------------------------------------------------------------------------------------------------ 2 EC11481-230 STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 2431 S 3 -MAMA (2431 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 | ------------------------------------------------------------------------------------------------------------------------------------ EC11481-2303 1 STIS/CCD ACQ F28X50OI MIRROR none none none none 1 N/A I EC11481-2303 2 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 1 N/A -MAMA 14746( 2) - 01-Jul-2016 14:06:56 - [ 4] Visit: 02 (FEIGE110) 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 FEIGE110 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 FEIGE110 STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 2453 S -MAMA (2453 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 | ------------------------------------------------------------------------------------------------------------------------------------ FEIGE110 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A FEIGE110 2 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 1 N/A -MAMA 14746( 2) - 01-Jul-2016 14:06:56 - [ 5] Visit: 03 (PG0909+276) 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 PG0909+276 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 PG0909+276 STIS/FUV ACCUM 0.2X0.2 E140M 1425 1 2469 S -MAMA (2469 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 | ------------------------------------------------------------------------------------------------------------------------------------ PG0909+276 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A PG0909+276 2 STIS/FUV ACCUM 0.2X0.2 E140M 1425 none none none none 1 N/A -MAMA 14746( 2) - 01-Jul-2016 14:06:56 - [ 6] Summary Form for Proposal 14746 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 0.2X0.2, F28X50LP, F28X50OII ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements E140M, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names EC11481-2303, FEIGE110, PG0909+276 ------------------------------------------------------------------------------------------------------------------------------------