5310( 14) - 01/02/96 15:44 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5310 Version: 14 Check-in Date: 02-Jan-1996 15:38:57 1.Proposal Title: AB DORADUS: THE KEY OBJECT OF STELLAR ACTIVITY ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle COOL STARS,STELLAR AC GO 4 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: VILHU, OSMI University of Helsinki ------------------------------------------------------------------------------------ 6. Abstract AB Doradus (K2IV) is the best target to study stellar activity at high levels. It has many important properties to have a high priority for ST UV-observations: 1.) It is bright (V=6.9) and its chromospheric-transition region line fluxes are among the highest ones and easily accessible for GHRS-observations. 2.) Its activity at different wavelengths can be modelled by a rather stable geometry (see Fig.3) which is very suitable for Doppler-imaging and interpretation. 3.) The rotation period is short (12 hours) permitting significant results in a reasonable observation time. 4.) With a high probability major UV-X ray flares take place during one rotation cycle. High resolution observations of TR region lines during the flares are physically crucial. 5.) Co-rotating transients at several stellar radii, carrying out angular momentum from the star, can be observed in 12 hours. 5.) AB Doradus (Delta = -65 deg) lies in the continuos viewing zone. This is valuable if 12 hours of spacecraft time will be allocated. Then no flares nor transients will be lost. We propose that AB Doradus will be observed continuosly during 12 hours of total spacecraft time with the G160M grating. Its resolving power (20000) is ideal for the star's rotational velocity (100 km/s). The region around CIV 1550 will be observed with 3 min time resolution. This is optimal for flares and transients, for the Doppler-imaging spectra will be co-added. ------------------------------------------------------------------------------------ Observations Description ------------------------ Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 5310( 14) - 01/02/96 15:44 - [ 2] Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 5310( 14) - 01/02/96 15:44 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD36705 STAR,K V-IV,T TAURI RA=5H 28M 44.8S +/- 0.030S, DEC= J2000 V = 29.0 V = 6.9+/-0.1 STAR,FK COMAE STAR, -65D 26' 56.8" +/- 0.40", PLATE B-V = 8.299999999999999+/-0.3e-1 -ID=02I7 E(B-V) = 30.0+/-20.0e-3 F-LINE(1550.0)=12.0+/-3.0e-13 W-LINE(1550.0)=5.0+/-1.0e-1 Comments: THIS IS A CVZ TARGET. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) J2000 0.0084 0.135 0.04 2 HD36705-FIX STAR,K V-IV,T TAURI RA=5H 28M 44.84S +/- 0.030S, J2000 V = 29.0 V = 6.9+/-0.1 STAR,FK COMAE STAR, DEC= -65D 26' 55.4" +/- 0.40" B-V = 8.299999999999999+/-0.3e-1 E(B-V) = 30.0+/-20.0e-3 F-LINE(1550.0)=12.0+/-3.0e-13 W-LINE(1550.0)=5.0+/-1.0e-1 Comments: THIS IS A CVZ TARGET. Hipparcos Coords and proper motion values. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) J2000 0.00802 0.131 0.04 5310( 14) - 01/02/96 15:44 - [ 4] 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 ------------------------------------------------------------------------------------------------------------------------------------ 10 HD36705 HRS ACQ 2.0 MIRROR-N2 BRIGHT=RETURN, 1 3.6S ONBOARD ACQ FOR 20 SEARCH-SIZE=3 Comments: PLEASE NOTIFY P.I. WHEN DATES ARE SCHEDULED OR CHANGED (FOR COORDINATED OBSERVATIONS) IN ACQ EXPECT ABOUT 23000 CTS/S, HENCE STEP-TIME 0.4 SEC ------------------------------------------------------------------------------------------------------------------------------------ 20 HD36705 HRS ACCUM 2.0 G160M 1549.0 COMB=FOUR, STEP 151 3M -PATT=DEF, DOPPLER=DEF, FP -SPLIT=STD Comments: THESE EXPOSURES SHOULD BE SCHEDULED WHEN THE TARGET IS IN THE CVZ. TOTAL POINTING TIME 12 H. WE NEED SMALL DEAD-TIMES . IF LESS THAN 1 MIN OVHD TIME POSSIBLE, CONSIDER TO DO SHORTER AND MORE EXP'S ------------------------------------------------------------------------------------------------------------------------------------ 5310( 14) - 01/02/96 15:44 - [ 5] Visit: 02 Visit Requirements: CVZ On Hold Comments: Additional Comments: Visit 1 failed. Visit 2 is the repeat observation. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 HD36705-FIX HRS ACQ 2.0 MIRROR-N2 BRIGHT=RETURN, 1 3.6S ONBOARD ACQ FOR 15-20 SEARCH-SIZE=3 Comments: PLEASE NOTIFY P.I. WHEN DATES ARE SCHEDULED OR CHANGED (FOR COORDINATED OBSERVATIONS) IN ACQ EXPECT ABOUT 23000 CTS/S, HENCE STEP-TIME 0.4 SEC ------------------------------------------------------------------------------------------------------------------------------------ 15 HD36705-FIX HRS IMAGE 2.0 MIRROR-N2 1 51.2S Comments: Specified the minimum legal exposure time for 16x16 pixels ------------------------------------------------------------------------------------------------------------------------------------ 20 HD36705-FIX HRS ACCUM 2.0 G140L 1435 COMB=FOUR, STEP 32 576S -PATT=4, DOPPLER=DEF, FP -SPLIT=NO Comments: WE NEED SMALL DEAD-TIMES. IF LESS THAN 1 MIN OVHD TIME POSSIBLE, CONSIDER TO DO SHORTER AND MORE EXP'S ------------------------------------------------------------------------------------------------------------------------------------ 5310( 14) - 01/02/96 15:44 - [ 6] Summary Form for Proposal 5310 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HRS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACCUM IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BRIGHT=RETURN SEARCH-SIZE=3 FP-SPLIT=STD FP-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category COOL STARS,STELLAR ACTIVITY ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 20 CVZ ONBOARD ACQ FOR 15-20 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR-N2 G160M G140L ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD36705 HD36705-FIX ------------------------------------------------------------------------------------------------------------------------------------