Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 3023c Report Date: 09-May-96:17:50 Version: ********** Check-in Date: ********** 1.Proposal Title: DEMONSTRATION SCIENCE: THE CHROMOSPHERE OF ALPHA TAU ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID STELLAR ASTROPHYSICS SAT/HRS Sub Category ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Dennis C. Ebbets BALL AEROSPACE SYSTEM GROUP/ USA (301)-338-1437 ASTROPHYSICIST ------------------------------------------------------------------------------------ 7. Abstract The C II intercombination lines (UV 0.01) near 2325 A will be used to estimate the turbulent velocity and electron density in the chromosphere of the K giant Alpha Tau. High S/N Mg II profiles will be acquired to search for discrete absorption features superposed on the emission lines. LSA and SSA observations using echelle B and G270M are made to allow experiments with deconvolution of LSA and medium resolution data. ------------------------------------------------------------------------------------ 8. Scientific Key Words: COOL STARS: WINDS, CHROMOSPHERES, MASS-LOSS. ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 2.30 par: 0 10. Num targs pri: 1 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: HRS ------------------------------------------------------------------------------------ 12. Special sched req: Real Time obs. ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 3023c PI: Dennis C. Ebbets Proposal Title: DEMONSTRATION SCIENCE: THE CHROMOSPHERE OF ALPHA TAU ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Dennis C. Ebbets BASG USA Kenneth G. Carpenter NASA - GODDARD SPACE FLIGHT USA CENTER Richard Robinson CSC @ NASA-GSFC USA ------------------------------------------------------------------------------------ 3. Description of proposed observations. The following observations are made on Alpha Tau: 1. Ech-B LSA and SSA at 2325 A C II 2. G270M LSA and SSA at 2345 A C II/SI II/FE II 3. ECH-B SSA at 2799 A MG II ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. The data required for this program consists of UV spectra not obtainable from the ground. IUE does not have the required wavelength resolution and S/N capability required to obtain the high precision line profiles and absolute velocities required for our program. ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. An interactive acquisition is requested unless onboard acquisitions have been adequately validated before the execution of these observations. An onboard acquisition is included to be used if possible. ------------------------------------------------------------------------------------ 6. Description of special calibration exposures. ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. The data will be reduced and analyzed primarily with in-house software developed for analysis of IUE data and with new software to be developed in-house. Software used during ground-based calibration of HRS at Ball Aerospace (Boulder, co) by the PI, will also be used in the reduction and analysis of these observations. ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). See section 7. ------------------------------------------------------------------------------------ 12. The target observed in this program is: Alpha Tau Kenneth Carpenter (301)-286- 3453 is the principal contact. ------------------------------------------------------------------------------------ 13. We plan UV spectroscopic observations (with GHRS) of the K giant Alpha Tau. ------------------------------------------------------------------------------------ 11. Address Information Name: DENNIS C. EBBETS Category: PI Institution: BALL AEROSPACE SYSTEMS GROUP Address: @STSCI City: BALTIMORE State: MD Zip Code: 21818 Country: USA Telephone: 301-338-1437 Telex (or e-mail): ------------------------------------------------------------------------------------ Page 3 Name: KENNETH G. CARPENTER Category: CON Institution: NASA-GODDARD SPACE FLIGHT CENTER Address: CODE 681 City: GREENBELT State: MD Zip Code: 20771 Country: USA Telephone: 301-286-3453 Telex (or e-mail): ------------------------------------------------------------------------------------ Name: RICHARD ROBINSON Category: Institution: CSC @ NASA-GODDARD SPACE FLIGHT C Address: CODE 681 City: GREENBELT State: MD Zip Code: 20771 Country: USA Telephone: Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 3023c [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial |Acqui|FLX| Flux data No | Name | Description | Position |Eqnx | Vel. |Prblm|REF| | | | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD29139 K5 III RA=04H33M02.896S+/-0.1", 1950 V=+54 1 V=0.84+/-.2,TYPE=K5 III ALPHA-TAU DEC=16D24'37.51"+/-0.1" 1 F(2327)=3.E-12 2 F(2799)=8.E-11 Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) B 1950.00 0.0043 +/- 0.0001 -0.1890 +/- 0.0010 0.0000 +/- 0.0000 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 3023c [ 5] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 HD29139 HRS ACQ 2.0 MIRROR-N2 SEARCH-SIZE=5 1 1325.0S 1 1 CYCLE 0 / 1.0-7 INT ACQ FOR 1.2 Comments: STEP TIME = 0.2 SEC ------------------------------------------------------------------------------------------------------------------------------------ 1.2 HD29139 HRS ACQ 2.0 MIRROR-N2 SEARCH-SIZE=1 1 53.0S 1 1 ONBOARD ACQ FOR MAP=END-POINT 1.5-1.8 LOCATE=NO Comments: TAKE MAP AFTER SLEW, WITH 1.2 SEC INTEGRATIONS ------------------------------------------------------------------------------------------------------------------------------------ 1.5 HD29139 HRS ACCUM 2.0 ECH-B24 2327 STEP-PATT=7 3 5.0M 50 1 1 Comments: S/N=50 IN COADD OF ALL 3 EXPOSURES (15 MIN). VERIFIES STAR IN LSA & PROVIDES DATA FOR DECONV. ------------------------------------------------------------------------------------------------------------------------------------ 1.7 HD29139 HRS ACCUM 2.0 G270M 2345.5 STEP-PATT=5 1 5.0M 50 1 1 Comments: EXP. VERIFIES STAR IN LSA & PROVIDES DATA FOR DECONV. ------------------------------------------------------------------------------------------------------------------------------------ 1.8 HD29139 HRS ACQ/ 0.25 MIRROR-A2 1 9.2S 1 ONBOARD ACQ FOR 3, PEAKUP 3.5,5,7 ------------------------------------------------------------------------------------------------------------------------------------ 2 WAVE HRS ACCUM SC1 ECH-B24 2327 STEP-PATT=3 1 3.2S 1 CALIB FOR 3 NO SLEW SEQ 2-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 3 HD29139 HRS ACCUM 0.25 ECH-B24 2327 STEP-PATT=7 1 5.0M 60 1 1 SEQ 3-3.5 NO GAP Comments: S/N=60 IN COADD OF ALL 12 EXPOSURES (60 MIN). PRIMARY SCIENCE EXPOSURE. RESOLVES C II LINES FOR VTURB AND DENSITY ESTIMATION. ------------------------------------------------------------------------------------------------------------------------------------ 3.5 HD29139 HRS ACCUM 0.25 ECH-B24 2327 STEP-PATT=7 11 5.0M 60 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE HRS ACCUM SC1 G270M 2345.5 STEP-PATT=3 1 3.2S 1 CALIB FOR 5 NO SLEW SEQ 4-5 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 5 HD29139 HRS ACCUM 0.25 G270M 2345.5 STEP-PATT=5 4 5.0M 60 1 1 Comments: S/N=60 IN COADD OF ALL 4 EXPOSURES (20 MIN) DATA FOR DECONV. EXPER. ALSO GET FE II/ SI II LINES ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE HRS ACCUM SC1 ECH-B20 2799.0 STEP-PATT=3 1 3.2S 1 CALIB FOR 7 NO SLEW SEQ 6-7 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 3023c [ 6] ------------------------------------------------------------------------------------------------------------------------------------ 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |10 | 11 | 12 |13 |14| 15 ------------------------------------------------------------------------------------------------------------------------------------ Line | Seq | Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | S/N |Flx|Pr| Special Number | Name | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| |Rel. Time|Ref| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 7 HD29139 HRS ACCUM 0.25 ECH-B20 2799.0 STEP-PATT=7 2 220.0S 100 2 1 Comments: S/N=100 IN COADD OF TWO 2 EXPOSURES (7.3 MIN). MG II LINES. ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 3023c [ 7] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HRS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACCUM ACQ/PEAKUP ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SEARCH-SIZE=5 SEARCH-SIZE=1 MAP=END-POINT LOCATE=NO STEP-PATT=7 STEP-PATT=5 STEP-PATT=3 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for SAT/HRS ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 2.30 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR ASTROPHYSICS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CYCLE 0 / 1.0-7; INT ACQ FOR 1.2; ONBOARD ACQ FOR 1.5-1.8; ONBOARD ACQ FOR 3,3.5,5,7; CALIB FOR 3 NO SLEW; SEQ 2-3 NON-INT SEQ 3-3.5 NO GAP; CALIB FOR 5 NO SLEW; SEQ 4-5 NON-INT CALIB FOR 7 NO SLEW; SEQ 6-7 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR-N2 ECH-B24 G270M MIRROR-A2 ECH-B20 ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD29139 ALPHA-TAU ------------------------------------------------------------------------------------------------------------------------------------