Corrected Phase2 with COS G140L FP-POS=4 removed. ----- Attempting Submission 1 (Fri Oct 31 18:59:21 GMT 2008) ----- Phase II Proposal 11829 (11829_ph2.apt) successfully submitted. ----- Attempting Submission 2 (Fri Dec 04 21:28:04 GMT 2009) ----- Assigned ID: 514 ----- Attempting Submission 1 (Fri Mar 07 19:38:57 GMT 2008) ----- Phase I Proposal 514 (AMG_cyc17.apt) successfully submitted. ----- Attempting Submission 2 (Fri Mar 07 23:05:37 GMT 2008) ----- Phase I Proposal 514 (AMG_cyc17.apt) successfully submitted. ----- Attempting Submission 3 (Sat Mar 08 00:45:05 GMT 2008) ----- 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.

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. 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. COOL STARS 12 false 0.0 0.0 false false false false false false SUPPORTED STAR G V-IV J2000 16 13 48.5585 -57 34 13.84 J2000 COS/FUV Spectroscopic No No G140L 1230 COS/FUV Spectroscopic No No G140L 1230 COS/FUV Spectroscopic No No G140L 1230 COS/FUV Spectroscopic No No G140L 1230 The scheduling data was generated by CASM 17.2. CASM was run in Phase II mode. C:\Documents and Settings\Alex Brown\OP-cache\11829_ph2rev-v01.xml 1259959663562 (Tic-Visit :proposal-id 11829 :visit-id "01" :proposal-version -1 :trans-version "20090702" :date "04-Dec-2009 13:47:43.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 765680 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 11829 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 11829 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2975 :al-overhead-at-end 0 :internal-dur-at-end 50 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3310 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11829 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3085 :al-overhead-at-end 0 :internal-dur-at-end 50 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3310 :pcs-gap 0 ) (Tic-Orbit :proposal-id 11829 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3082 :al-overhead-at-end 0 :internal-dur-at-end 352 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3310 :pcs-gap 0 ) true 3 0