Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 5673 Report Date: 18-Jul-95:17:50 Version: ********** Check-in Date: ********** 1.Proposal Title: CEPHEID MASSES - CYC 4 HIGH - PART 2 ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID COOL STARS GO 3 Long Term yrs 5357 Sub Category PULSATING STARS ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Erika Hr Bohm-vitense 3760 USA 206 543 4858 ------------------------------------------------------------------------------------ 7. Abstract For 2 decades the "Cepheid mass problem" has persisted: Mass determinations from standard evolutionary tracks and those from pulsation theory gave conflicting values. The luminosity of a Cepheid of given mass depends sensitively on the amount of convective overshoot above the core of the main sequence progenitor. Hence a good mass determination for the Cepheid with known luminosity will measure the amount of convective core overshoot. This knowledge is important for interpretation of HR diagrams of populous clusters in the LMC and especially for age determinations. It is also necessary for the understanding of the mixing processes in stars. Program 5357 obtained the GHRS spectra for this program. This is a follow-on part 2 to obtain the calibration spectra to measure the radial velocity of the 2 primary targets observed in 5357. ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 1.61 par: 0 10. Num targs pri: 2 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: HRS ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 5673 PI: Erika Hr Bohm-vitense Proposal Title: CEPHEID MASSES - CYC 4 HIGH - PART 2 ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Erika Hr Bohm-Vitense 3760 U.S.A. Nancy R Evans INST. SPACE & TERRESTRIAL CANADA SCIENCE, NORTH YORK Kenneth G Carpenter 2856 U.S.A. ------------------------------------------------------------------------------------ 3. Description of proposed observations. The purpose of this proposal is to obtain GHRS calibration spectra on two targets. Standard GHRS spectra will be obtained after routine onboard target acquisitions are performed. Internal wavelength calibrations are performed in association with the external observations. ------------------------------------------------------------------------------------ 11. Address Information Name: ERIKA HR BOHM-VITENSE Category: PI Institution: 3760 Address: ASTR.DEP. FM-20 UNIVERSITY OF WASHINGTON City: SEATTLE State: WA Zip Code: 98195 Country: USA Telephone: 206 543 4858 Telex (or e-mail): 206 685 0403 ------------------------------------------------------------------------------------ Name: ERIKA HR BOHM-VITENSE Category: PI Institution: 3760 Address: ASTRONOMY DEPARTMENT FM-20 UNIVERSITY OF WASHINGTON City: SEATTLE State: WA Zip Code: 98195 Country: U.S.A. Telephone: (206) 543 4858 Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 5673 [ 3] ------------------------------------------------------------------------------------------------------------------------------------ 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| | | | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 2 HD66591- A,111 RA= 08H 00M 20.00S +/- 1.0", 2000 V=22.0 1 V=4.82+/-0.02, TYPE=B3V CALIB HR3159 DEC= -63D 34' 03.2" +/- 1 B-V=-0.17+/-0.02 1.0", 2 E(B-V)=0.0 PLATE-ID=00MQ 3 F-CONT(1722)=5.0E-10 Comments: THIS IS A VELOCITY CALIBRATION STAR FOR THE OBSERVATIONS OF S-MUS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) J 1980.00 0.0010 +/- 0.0000 0.0200 +/- 0.0100 0.0040 +/- 0.0010 ------------------------------------------------------------------------------------------------------------------------------------ 4 HD172167- A,123 RA= 18H 36M 56.3S +/-0.1S, 2000.00 V=-14.0 1 V=0.02+/-0.02, TYPE=A0V CALIB HR7001 DEC= +38D 47' 01" +/-1" 1 B-V=0.01 ALPHA-LYRAE 2 E(B-V)=0.0 3 F-CONT(1860)=5.5E-9 Comments: THIS IS A CALIBRATION STAR TO MEASURE THE RADIAL VELOCITY OF Y-CAR-B Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) J 2000.00 0.0171 +/- 0.0006 0.2900 +/- 0.0300 0.1200 +/- 0.0100 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 5673 [ 4] ------------------------------------------------------------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------------------------------------------------------------ 71 HD66591- HRS ACQ 2.0 MIRROR-N2 LOCATE=YES 1 1.8S 1 1 ONBOARD ACQ FOR CALIB BRIGHT=RETURN 71.2-71.6 SEARCH-SIZE=3 SEQ 71.0-71.8 NO GAP CYCLE 4/71.0-81.6 Comments: USE STEP-TIME = 0.2 SEC. EXPECT 12000. CTS/200MS THIS STAR WAS OBSERVED ALSO IN DEC 93 ------------------------------------------------------------------------------------------------------------------------------------ 71.2 HD66591- HRS ACQ/ 0.25 MIRROR-N2 SEARCH-SIZE=5 1 10.0S 1 1 ONBOARD ACQ FOR CALIB PEAKUP 71.4-71.8 SEQ 71.2-71.8 NON- INT Comments: STEP-TIME = 0.2 SEC ------------------------------------------------------------------------------------------------------------------------------------ 71.4 WAVE HRS ACCUM SC2 ECH-B 1722.0 STEP-PATT=3 1 30.0S 1 CALIB FOR 71.6 NO SLEW ------------------------------------------------------------------------------------------------------------------------------------ 71.6 HD66591- HRS ACCUM 0.25 ECH-B 1722.0 STEP-PATT=7 2 27.2S 15 2 1 CALIB FP-SPLIT=NO Comments: S/N IS FOR SUM OF 2 EXP'S ------------------------------------------------------------------------------------------------------------------------------------ 71.8 WAVE HRS ACCUM SC2 ECH-B 1722.0 STEP-PATT=3 1 30.0S 1 CALIB FOR 71.6 NO SLEW ------------------------------------------------------------------------------------------------------------------------------------ 81 HD172167- HRS ACQ 2.0 MIRROR-A2 LOCATE=YES 1 1.8S 1 1 ONBOARD ACQ FOR CALIB BRIGHT=RETURN 81.2-81.6 SEARCH-SIZE=3 SEQ 81.0-81.6 NO GAP Comments: USE STEP-TIME = 0.2 SEC. EXPECT >>>> CTS/200MSEC ------------------------------------------------------------------------------------------------------------------------------------ 81.2 HD172167- HRS ACQ/ 0.25 MIRROR-A2 SEARCH-SIZE=5 1 10.0S 1 1 ONBOARD ACQ FOR CALIB PEAKUP 81.4-81.6 SEQ 81.2-81.6 NON- INT Comments: STEP-TIME = 200 MSEC ------------------------------------------------------------------------------------------------------------------------------------ 81.4 WAVE HRS ACCUM SC2 G200M 1860.0 STEP-PATT=3 1 30.0S 1 CALIB FOR 81.6 NO SLEW ------------------------------------------------------------------------------------------------------------------------------------ 81.6 HD172167- HRS ACCUM 0.25 G200M 1860.0 STEP-PATT=5 2 27.2S 15 2 1 CALIB FP-SPLIT=NO Comments: S/N IS FOR SUM OF 2 EXP'S ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 5673 [ 5] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HRS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACQ/PEAKUP ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters LOCATE=YES BRIGHT=RETURN SEARCH-SIZE=3 SEARCH-SIZE=5 STEP-PATT=3 STEP-PATT=7 FP-SPLIT=NO STEP-PATT=5 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GO ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 1.61 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category COOL STARS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category PULSATING STARS ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 71.2-71.6; SEQ 71.0-71.8 NO GAP; CYCLE 4/71.0-81.6; ONBOARD ACQ FOR 71.4-71.8; SEQ 71.2-71.8 NON-INT; CALIB FOR 71.6 NO SLEW; CALIB FOR 71.6 NO SLEW ONBOARD ACQ FOR 81.2-81.6; SEQ 81.0-81.6 NO GAP; ONBOARD ACQ FOR 81.4-81.6; SEQ 81.2-81.6 NON-INT; CALIB FOR 81.6 NO SLEW; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR-N2 ECH-B MIRROR-A2 G200M ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD66591-CALIB HR3159 HD172167-CALIB HR7001 ALPHA-LYRAE ------------------------------------------------------------------------------------------------------------------------------------