11829( 3) - 07-Dec-2009 12:13:26 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 11829 Version: 3 Check-in Time: 07-Dec-2009 12:13:26 STScI Edit Number: 0 Title Coronal and Transition Region Heating Due to Magnetic Activity on Metal-Poor Dwarf Stars ------------------------------------------------------------------------------------ Type Cycle GO 17 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Alexander Brown University of Colorado at Boulder CoI: Dr. Graham M. Harper University of Colorado at Boulder N CoI: Dr. Thomas R. Ayres University of Colorado at Boulder N ------------------------------------------------------------------------------------ Abstract How does low metallicity affect the heating and resultant temperature structure of the chromospheres, transition regions, and coronae of old solar-like dwarf stars? Our ACIS-S observations of 7 Gyr old Arcturus Moving Group (AMG) dwarfs show very little conventional coronal (> 1 MK) plasma and suggest that these stars have insufficient magnetic energy input to power a solar-like corona. However, they do have chomospheres and transition regions similar to the minimum activity Quiet Sun. It this typical or an aberration of the AMG? We propose a 35 ksec ACIS-S observation and HST COS spectroscopy of the nearest (9.2 pc), truely metal-poor ([Fe/H] = -1.4) dwarf star that is known to have definite magnetic dynamo activity (activity cycles, active region modulation) -- HD103095 -- to investigate this question further. ------------------------------------------------------------------------------------ Observations Description ------------------------ The metal-poor G8 dwarf HD103095 is to be observed using COS G140L/G160M/G130M during the 3 orbits allocated . HD130095 is visually bright with V = 6.45 and has very accurate coordinates from the Hipparcos Catalogue. However, its proper motion is very large at 7 arcseconds per year. The coordinates given in this Phase II proposal are already corrected for proper motion to 2000.0. Our observational sequence is: Acquisition consists of a 3X3 ACQ/SEARCH followed by an ACQ/IMAGE. The G140L (1230A) spectrum is taken in four pieces at the nominal FP-POS (1->4) positions. We do FP-POS=1, 2, and 3 in the first orbit and FP-POS=4 in the second orbit to maximize exposure time at the shorter wavelengths (e.g N V at 1238, 1242A). Then 3 segments of G160M spectra are obtained followed by 2 G130M exposures. For our acquistion we use BOA+MIRRORB and 15 second exposures. Fragementary STIS and GHRS data exist for HD103095. Using V=6.45 to normalize G8V or K0V models puts the count rate right at the limit of MIRRORA+BOA but using the observed flux at 2700 A to normalize shows that MIRRORB is needed (see COS ETC output COS85797-COS85802. Because of the large proper motion we use a 3X3 NUV ACQ/SEARCH, although we think that the predicted position corrected for proper motion should be good to betetr than 1 arcsecond. 11829( 3) - 07-Dec-2009 12:13:26 - [ 2] The COS Spectroscopy ETC indicates no problems when fed the existing GALEX GRISM spectra for similar metal poor dwarfs. 2009 DEC 4: G140L FP-POS=4 exposure removed per STScI instructions --- exposure time moved to existing G130M exposures which cover same short-wavelength emission lines. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 11829( 3) - 07-Dec-2009 12:13:26 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD103095 STAR, G V-IV RA=11H52M58.7690S +/- 0.1", J2000 V = 6.45 +/- 0.01 DEC=+37D43'7.24" +/- 0.1" Reference Frame: ICRS Comments: Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000.0 0.337491 -5.8130 0.1092 ------------------------------------------------------------------------------------------------------------------------------------ 11829( 3) - 07-Dec-2009 12:13:26 - [ 4] 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 HD103095 COS/NUV ACQ/SEA BOA MIRRORB SCAN-SIZE=3 1 15 S RCH ------------------------------------------------------------------------------------------------------------------------------------ 2 HD103095 COS/NUV ACQ/IMA BOA MIRRORB 1 15 S GE ------------------------------------------------------------------------------------------------------------------------------------ 3 HD103095 COS/FUV TIME-TA PSA G140L 1230 BUFFER-TIME=510, FP-POS=1 1 620 S G ------------------------------------------------------------------------------------------------------------------------------------ 4 HD103095 COS/FUV TIME-TA PSA G140L 1230 BUFFER-TIME=525, FP-POS=2 1 635 S G ------------------------------------------------------------------------------------------------------------------------------------ 5 HD103095 COS/FUV TIME-TA PSA G140L 1230 BUFFER-TIME=525, FP-POS=3 1 635 S G ------------------------------------------------------------------------------------------------------------------------------------ 6 HD103095 COS/FUV TIME-TA PSA G160M 1577 BUFFER-TIME=770 1 880 S G ------------------------------------------------------------------------------------------------------------------------------------ 7 HD103095 COS/FUV TIME-TA PSA G160M 1600 BUFFER-TIME=770 1 880 S G ------------------------------------------------------------------------------------------------------------------------------------ 8 HD103095 COS/FUV TIME-TA PSA G160M 1623 BUFFER-TIME=775 1 885 S G ------------------------------------------------------------------------------------------------------------------------------------ 9 HD103095 COS/FUV TIME-TA PSA G130M 1309 BUFFER-TIME=1310 1 1420 S G ------------------------------------------------------------------------------------------------------------------------------------ 10 HD103095 COS/FUV TIME-TA PSA G130M 1327 BUFFER-TIME=1310 1 1420 S G ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD103095 1 COS/NUV ACQ/SEA BOA MIRRORB none none none none 1 N/A RCH HD103095 2 COS/NUV ACQ/IMA BOA MIRRORB none none none none 1 N/A GE HD103095 3 COS/FUV TIME-TA PSA G140L 1230 none none none none 1 N/A G 11829( 3) - 07-Dec-2009 12:13:26 - [ 5] 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD103095 4 COS/FUV TIME-TA PSA G140L 1230 none none none none 1 N/A G HD103095 5 COS/FUV TIME-TA PSA G140L 1230 none none none none 1 N/A G HD103095 6 COS/FUV TIME-TA PSA G160M 1577 none none none none 2 N/A G HD103095 7 COS/FUV TIME-TA PSA G160M 1600 none none none none 2 N/A G HD103095 8 COS/FUV TIME-TA PSA G160M 1623 none none none none 2 N/A G HD103095 9 COS/FUV TIME-TA PSA G130M 1309 none none none none 3 N/A G HD103095 10 COS/FUV TIME-TA PSA G130M 1327 none none none none 3 N/A G 11829( 3) - 07-Dec-2009 12:13:26 - [ 6] Summary Form for Proposal 11829 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures BOA, PSA ------------------------------------------------------------------------------------------------------------------------------------ Configurations COS/FUV, COS/NUV ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/IMAGE, ACQ/SEARCH, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1310, BUFFER-TIME=510, BUFFER-TIME=525, BUFFER-TIME=770, BUFFER-TIME=775, FP-POS=1, FP-POS=2, FP-POS=3, SCAN-SIZE=3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G130M, G140L, G160M, MIRRORB ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD103095 ------------------------------------------------------------------------------------------------------------------------------------