8889( 3) - 09/19/01 11:51 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 8889 Version: 3 Check-in Date: 19-Sep-2001 11:50:38 1.Proposal Title: Tortured Coronae in the Rapid Breaking Zone ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 9 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Thomas Ayres University of Colorado at Boulder ------------------------------------------------------------------------------------ 5. Abstract Deep Chandra X-ray Observatory high energy transmission grating (HETGS) exposures of three key G0-G5 giants will address fundamental questions concerning their hot magnetized coronae by determining temperatures and densities, probing chemical fractionation processes, and exploring plasma dynamics. The giants lie in or near the "Rapid Braking Zone" where moderate mass stars undergo a radical transformation of their outer atmospheres, perhaps as a relic magnetosphere is disrupted by the onset of a solar-like dynamo. These are ideal targets to exploit the experience gained in the CXO "Emission Line Project" studies of the active binaries Capella and HR 1099. For two of the targets--31 Comae and Mu Velorum--we will obtain contemporaneous medium-resolution far-UV echelle spectra using the HST/STIS E140M mode for 3 orbits each. The far-UV spectra will provide a snapshot of the physical state of the subcoronal atmosphere during each long X-ray grating exposure, and will tie directly into the 2-25 A HETGS spectra by recording the key Fe XXI 1354 A coronal forbidden line. ------------------------------------------------------------------------------------ Observations Description ------------------------ The STIS FUV observations are straightforward. First, the target is acquired with the CCD, and then a PEAK-UP is performed using one of the very narrow ND- filtered apertures. The E140M/FUV-MAMA observations are carried out with the 0.2X0.2 "photometric" aperture in ACCUM mode. The same strategy has been used successfully in cycle 8 large project 8280 (73 orbits for 13 late-type stars). Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- It would be optimum to have the STIS observation scheduled to coincide with the long Chandra exposures, which typically last for a day or more. ------------------------------------------------------------------------------------ 8889( 3) - 09/19/01 11:51 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD111812 STAR, G III-I, CORONA, RA=12H 51M 41.92S +/- 0.05S, 2000 V = 0 V = +4.93+/-0.1 WIND DEC=+27D 32' 26.6" +/- 1" B-V = +0.68+/-0.1 F-CONT(1500)=0.3+/-0.1e-13 F(1548)=14+/-1e-13 TYPE=G0III Coordinate Source: OTHER_SOURCE Comments: Positions & Proper Motions from Hipparcos Catalogue; FUV fluxes from GHRS spectra Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) J2000 -0.0007 -0.0088 0.0106 2 HD93497 STAR, G III-I, CORONA, RA=10H 46M 46.18S +/- 0.05S, 2000 V = 0 V = +2.69+/-0.1 WIND DEC=-49D 25' 12.9" +/- 1" B-V = +0.90+/-0.1 F-CONT(1500)=0.5+/-0.1e-13 F(1548)=8+/-1e-13 TYPE=G5III Coordinate Source: OTHER_SOURCE Comments: Positions & Proper Motions from Hipparcos Catalogue; FUV fluxes from IUE spectra Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) J2000 0.0064 -0.054 0.0282 8889( 3) - 09/19/01 11:51 - [ 3] Visit: 01 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Desirable to schedule observation entirely within the ~1D duration of the Chandra X-ray Observatory pointing on the same target Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD111812 STIS/C ACQ F28X50O MIRROR 1 0.1 S CD III Comments: S/N=139, 12000 e- ------------------------------------------------------------------------------------------------------------------------------------ 2 HD111812 STIS/C ACQ/PEA 0.3X0.0 MIRROR 1 0.2 S CD K 5ND Comments: S/N=116, 8400 e- ------------------------------------------------------------------------------------------------------------------------------------ 3 HD111812 STIS/F ACCUM 0.2X0.2 E140M 1425 BINAXIS1=NO,BINAXIS2=NO 1 1887 S UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 4 HD111812 STIS/F ACCUM 0.2X0.2 E140M 1425 BINAXIS1=NO,BINAXIS2=NO 2 2923 S UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 8889( 3) - 09/19/01 11:51 - [ 4] Visit: 02 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Desirable to schedule observation entirely within the ~1D duration of the Chandra X-ray Observatory pointing on the same target Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD93497 STIS/C ACQ F25ND5 MIRROR 1 0.5 S CD Comments: S/N=85, 4600 e- ------------------------------------------------------------------------------------------------------------------------------------ 3 HD93497 STIS/F ACCUM 0.2X0.2 E140M 1425 BINAXIS1=NO,BINAXIS2=NO 1 1997 S UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 4 HD93497 STIS/F ACCUM 0.2X0.2 E140M 1425 BINAXIS1=NO,BINAXIS2=NO 2 3054 S UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 8889( 3) - 09/19/01 11:51 - [ 5] Summary Form for Proposal 8889 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures F28X50OIII 0.3X0.05ND 0.2X0.2 F25ND5 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD STIS/FUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACQ/PEAK ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BINAXIS1=NO BINAXIS2=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR E140M ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD111812 HD93497 ------------------------------------------------------------------------------------------------------------------------------------ Wavelengths 1425 ------------------------------------------------------------------------------------------------------------------------------------