9273( 3) - 12/20/01 06:41 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 9273 Version: 3 Check-in Date: 20-Dec-2001 06:40:27 1.Proposal Title: Buried Alive in the Coronal Graveyard? ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle GO 10 ------------------------------------------------------------------------------------ 4. Investigators Contact? PI: Thomas Ayres University of Colorado at Boulder ------------------------------------------------------------------------------------ 5. Abstract We propose 20 ks pointings with Chandra HRC-I to obtain detections of two red giants in the depths of the "coronal graveyard." Our program will test the hypothesis that significant coronal activity persits on the red giants, but smothered beneath a "cool absorber" in the chromospheric envelope. Such activity might be the long- sought initiator of red giant winds. HST/STIS E140M spectra are proposed for one of the targets--alpha Tau (K5 III); to help probe conditions in the cool absorber. High -S/N STIS spectra already are available for the other target, alpha Boo (K2 III). ------------------------------------------------------------------------------------ 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 of alpha Tau scheduled within a few weeks of the Chandra exposure. ------------------------------------------------------------------------------------ 9273( 3) - 12/20/01 06:41 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD29139 STAR, K III-I, CORONA, RA=4H 35M 55.24S +/- 0.05S, 2000 V = 0 V = +0.87+/-0.1 WIND DEC=+16D 30' 33.5" +/- 1" B-V = +1.53+/-0.1 F-CONT(1550)=0.3+/-0.1e-13 F(1548)=3+/-1e-13 TYPE=K5III 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 0.0044 -0.189 0.0501 9273( 3) - 12/20/01 06:41 - [ 3] Visit: 01 Visit Priority: Visit Requirements: On Hold Comments: Additional Comments: Desirable to schedule observation within a few weeks 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 HD29139 STIS/C ACQ F25ND5 MIRROR 1 0.1 S CD Comments: S/N=96, 5800 e- ------------------------------------------------------------------------------------------------------------------------------------ 2 HD29139 STIS/C ACQ/PEA 0.2X0.0 G430M 3936 1 0.1 S CD K 9 Comments: S/N=113, 5700 e- ------------------------------------------------------------------------------------------------------------------------------------ 3 HD29139 STIS/F ACCUM 0.2X0.2 E140M 1425 BINAXIS1=NO,BINAXIS2=NO 1 1850 S UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 4 HD29139 STIS/F ACCUM 0.2X0.2 E140M 1425 BINAXIS1=NO,BINAXIS2=NO 3 2900 S UV-MAM A ------------------------------------------------------------------------------------------------------------------------------------ 9273( 3) - 12/20/01 06:41 - [ 4] Summary Form for Proposal 9273 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures F25ND5 0.2X0.09 0.2X0.2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD STIS/FUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACQ/PEAK ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BINAXIS1=NO BINAXIS2=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR G430M E140M ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD29139 ------------------------------------------------------------------------------------------------------------------------------------ Wavelengths 3936 1425 ------------------------------------------------------------------------------------------------------------------------------------