6795( 4) - 09/05/96 09:28 - [ 0] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6795 Version: 4 Check-in Date: 05-Sep-1996 09:25:02 1.Proposal Title: Sleuthing the Dynamo: The Final Frontier ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle COOL STARS GO 6 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Thomas Ayres University of Colorado CASA CoI: Alex Brown University of Colorado CASA N CoI: Graham Harper University of Colorado CASA N ------------------------------------------------------------------------------------ 6. Abstract Innovative technologies are opening new windows into the Sun; from its hidden interior to the far reaches of its turbulent outer envelope: rare-earth detectors for solar neutrinos; the GONG project for helioseismology; SOHO for high-resolution XUV spectroscopy, and YOHKOH for coronal X-ray imaging. At the same time, a fleet of space observatories--ROSAT, EUVE, ASCA, and HST itself--are providing unprecedented views of the vacuum-UV and X-ray emissions of stars in our Galactic neighborhood. These seemingly unrelated developments are in fact deeply connected. A central issue of solar-stellar physics is the nature and origin of magnetic activity: the link between the interior dynamics of a late-type star and the violent state of its outermost coronal layers. As solar physicists are unlocking the secrets of the hydromagnetic Dynamo deep inside the Sun, we and others have been documenting the early evolution of the Dynamo and its associated external gas-dynamic activity. In particular, we have obtained HST/FOS spectra of ten young solar-type stars in three nearby open clusters--the Hyades, Pleiades, and Alpha Persei--ranging in age from 50 Myr to 600 Myr. We have supplemented the HST spectroscopy with deep ROSAT pointings, and ground-based studies. Here, we will continue the HST side of our project by obtaining FUV spectra of two Alpha Perseids from our original program (but not yet observed), and high-S/N follow-up measurements of the hyperactive Pleiad H II 314. ------------------------------------------------------------------------------------ Observations Description ------------------------ Our original proposal was to record diagnostic-quality FUV spectra of solar- type stars in the young galactic clusters: Hyades, Pleiades, and Alpha Persei. We selected five stars from each cluster, which meet a number of strict criteria for membership, very likely are single, and have reddening- corrected colors corresponding to the restricted MK types G2+/-2 (to minimize the influence of surface temperature in the solar-stellar comparison). To date, ten of the original fifteen targets have been observed (with FOS/BL because GHRS Side 1 was unavailable during Cyc 2 & 3). Our Cycle 6 program has two distinct objectives: (1) Obtain Si IV & C IV detections, or firm upper limits, for two of the four remaining targets with spectral types G0--G1. (2) Record representative high-quality GHRS spectra of one of the hyperactive stars (H II 314) observed previously with the FOS. The availability of GHRS Side 1 offers the possibility to revisit several of our original diagnostic goals, which had to be deferred when the program was moved to FOS. Two settings of G140L can cover the full range 1160-1676, with redundant exposure of the 1400 A region (which contains the the key Si IV 1400 A doublet and crucial density diagnostic O IV] 1400 A multiplet). Also observed are the C IV 1549 A doublet, X-ray- activated He II 1640 A, the low-excitation C I 1657 A and O I 1305 A multiplets, and the intermediate- excitation Si III 1206 A resonance line and C III 1175 A multiplet. We FP-SPLIT the two settings, to mitigate the influence of bad pixels; selecting (sub-)exposure times sufficiently short (5-10m) to resolve any flare activity that might occur (as did for the FOS observation of H II 314). The cluster stars are too faint to be acquired directly on Side 1 of the GHRS, but an FOS-assisted acquisition is feasible (ACQ/binary for the two >11-th magnitude Alpha Perseids; bi-directional ACQ/Peak using G270H disperser for the 10-th magnitude Pleiad H II 314). Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 6795( 4) - 09/05/96 09:28 - [ 1] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 STAR- STAR, G V-IV, Corona RA=3H 44M 20.07S +/- 2000 V = +10.56+/-0.05 0344+2447 0.05S,DEC=24D 47' 46.8" +/- B-V = +0.64+/-0.05 1",PLATE-ID=009M TYPE=G0V Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1983.0 0.0 0.0 0.0 2 STAR- STAR, G V-IV, Corona RA=3H 26M 22.20S +/- 2000 V = +11.3+/-0.1 0326+4925 0.05S,DEC=49D 25' 38.1" +/- B-V = +0.70+/-0.05 1",PLATE-ID=02RP TYPE=G0V Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1983.7 0.0 0.0 0.0 3 STAR- STAR, G V-IV, Corona RA=3H 30M 47.58S +/- 2000 V = +10.93+/-0.1 0330+4753 0.05S,DEC=47D 53' 22.2" +/- B-V = +0.66+/-0.05 1",PLATE-ID=02RP TYPE=G0V Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1983.7 0.0 0.0 0.0 6795( 4) - 09/05/96 09:28 - [ 2] Visit: 01 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 STAR-0344+2 FOS/BL ACQ/PEA 4.3 G270H SEARCH-SIZE-X=1,SEARCH-SIZE-Y=3, 1 1.0 S ONBOARD ACQ FOR 2 447 K SCAN-STEP-Y=1.23,TYPE=UP Comments: First step of standard two-step ACQ/PEAK for 0.4" accuracy ------------------------------------------------------------------------------------------------------------------------------------ 2 STAR-0344+2 FOS/BL ACQ/PEA 1.0 G270H SEARCH-SIZE-X=6,SCAN-STEP-X=0.61, 1 1.8 S ONBOARD ACQ FOR 3-4 447 K SEARCH-SIZE-Y=2,SCAN-STEP-Y=0.61, TYPE=UP Comments: Second step of standard ACQ/PEAK, followed by two series of GHRS Side 1 G140L's ------------------------------------------------------------------------------------------------------------------------------------ 3 STAR-0344+2 HRS ACCUM 2.0 G140L 1303 COMB=FOUR,STEP-PATT=DEF, 2 1305.6 447 DOPPLER=DEF,FP-SPLIT=STD ------------------------------------------------------------------------------------------------------------------------------------ 4 STAR-0344+2 HRS ACCUM 2.0 G140L 1533 COMB=FOUR,STEP-PATT=DEF, 3 1305.6 447 DOPPLER=DEF,FP-SPLIT=STD ------------------------------------------------------------------------------------------------------------------------------------ 6795( 4) - 09/05/96 09:28 - [ 3] Visit: 02 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 STAR-0326+4 FOS/BL ACQ/BIN 4.3 MIRROR 1 1.2 S ONBOARD ACQ FOR 2-3 925 ARY Comments: Standard ACQ/BINARY followed by two GHRS Side 1 G140L's ------------------------------------------------------------------------------------------------------------------------------------ 2 STAR-0326+4 HRS ACCUM 2.0 G140L 1303 COMB=FOUR,STEP-PATT=DEF, 1 2067.2 925 DOPPLER=DEF,FP-SPLIT=STD ------------------------------------------------------------------------------------------------------------------------------------ 3 STAR-0326+4 HRS ACCUM 2.0 G140L 1533 COMB=FOUR,STEP-PATT=DEF, 2 1305.6 925 DOPPLER=DEF,FP-SPLIT=STD ------------------------------------------------------------------------------------------------------------------------------------ 6795( 4) - 09/05/96 09:28 - [ 4] Visit: 03 Visit Requirements: On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 STAR-0330+4 FOS/BL ACQ/PEA 4.3 G270H SEARCH-SIZE-X=1,SEARCH-SIZE-Y=3, 1 1.4 S ONBOARD ACQ FOR 2 753 K SCAN-STEP-Y=1.23,TYPE=UP Comments: First step of standard 2-step ACQ/PEAK with disperser G270H for 0.4" accuracy ------------------------------------------------------------------------------------------------------------------------------------ 2 STAR-0330+4 FOS/BL ACQ/PEA 1.0 G270H SEARCH-SIZE-X=6,SCAN-STEP-X=0.61, 1 2.5 S ONBOARD ACQ FOR 3-4 753 K SEARCH-SIZE-Y=2,SCAN-STEP-Y=0.61, TYPE=UP Comments: Second step of standard ACQ/PEAK, followed by two GHRS Side 1 G140L's ------------------------------------------------------------------------------------------------------------------------------------ 3 STAR-0330+4 HRS ACCUM 2.0 G140L 1303 COMB=FOUR,STEP-PATT=DEF, 1 1849.6 753 DOPPLER=DEF,FP-SPLIT=STD ------------------------------------------------------------------------------------------------------------------------------------ 4 STAR-0330+4 HRS ACCUM 2.0 G140L 1533 COMB=FOUR,STEP-PATT=DEF, 2 1088.0 753 DOPPLER=DEF,FP-SPLIT=STD ------------------------------------------------------------------------------------------------------------------------------------ 6795( 4) - 09/05/96 09:28 - [ 5] Summary Form for Proposal 6795 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOS/BL HRS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/PEAK ACCUM ACQ/BINARY ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SEARCH-SIZE-X=1 SEARCH-SIZE-Y=3 SCAN-STEP-Y=1.23 TYPE=UP SCAN-STEP-Y=0.61 FP-SPLIT=STD DOPPLER=DEF STEP-PATT=DEF COMB=FOUR SEARCH-SIZE-Y=2 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category COOL STARS ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 2 ONBOARD ACQ FOR 3-4 ONBOARD ACQ FOR 2-3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G270H G140L MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names STAR-0344+2447 STAR-0326+4925 STAR-0330+4753 ------------------------------------------------------------------------------------------------------------------------------------