Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 1148c Report Date: 09-May-96:16:14 Version: ********** Check-in Date: ********** 1.Proposal Title: HOT PULSATING WHITE DWARFS ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID STELLAR ASTROPHYSICS GTO/HRS Sub Category SUBLUMINOUS STARS ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Prof. John B. Hutchings DOMINION ASTROPHYSICAL OBSER CANADA (604) 388-3909 PROFESSOR ------------------------------------------------------------------------------------ 7. Abstract Continuous series of spectra with 1 minute time resolution will be taken of two hot subdwarfs with pulsational instabilities. The high time resolution will allow anlysis of the UV continuum variations which will reveal the type of pulsation. Suitable data timing should also reveal line feature changes in profile and velocity. One star is an eclipsing binary and data will be taken at key orbital phases. ------------------------------------------------------------------------------------ 8. Scientific Key Words: HOT STARS, WHITE DWARFS, PULSATIONAL INSTABILITIES ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 1.50 par: 0 10. Num targs pri: 2 par: 0 ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 1148c PI: Prof. John B. Hutchings Proposal Title: HOT PULSATING WHITE DWARFS ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ John B. Hutchings DOMINION ASTROPHYSICAL CANADA OBSERVATORY ------------------------------------------------------------------------------------ 3. Description of proposed observations. PG1159-035 will be obseerved for ~30 minutes with 1 minute readouts, with the low dispersion HRS grating. Any time will do, and the time is to be split into two 15 minute segments. BE UMA will be observed in the same way at 3 different times, at binary phases 0.5,0.0, and 0.25 or 0.75. These should be during the same or adjacent orbital cycles. ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. UV spectroscopy of faint objects with high time resolution cannot be done any other way. Ground-based supporting observations will be planned. ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. BE UMa orbital phase is important. Eclipse phase observations need timing accuracy of 5 minutes or better. ------------------------------------------------------------------------------------ 6. Description of special calibration exposures. Continuous 15 minute observations required to do time analysis. ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. All data will be analysed at DAO after ST standard processing, using a VAX extensive spectroscopic software. ------------------------------------------------------------------------------------ 8. Additional comments or special requests. Advance notice of scheduling to allow ground-based support would be helpful. This means observations should preferably be done when 12h RA is in night sky. All resources for data anlysis and personnel support. ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). All resources for analysis and personnel support. ------------------------------------------------------------------------------------ 13. HRS data will be take with 1 minute time resolution of PG1159-035 and BE UMa, to study UV pulsation phenomena. BE UMa data will be taken at 3 binary phases. ------------------------------------------------------------------------------------ 11. Address Information Name: JOHN B. HUTCHINGS Category: PI Institution: DOMINION ASTROPHYSICAL OBSERVATOR Address: 5071 W. SAANICH RD. R.R. #5 V8X 4M6 City: VICTORIA State: Zip Code: Country: CANADA Telephone: Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 1148c [ 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| | | | | | | | | ------------------------------------------------------------------------------------------------------------------------------------ 1 PG1159-035 WD RA=11H 59M 12.2S +/- 1", 1950 DEC=-03D 28' 56" +/- 1" ------------------------------------------------------------------------------------------------------------------------------------ 2 BE-UMA WD+M BINARY RA=11H 55M 9.8S +/- 1", 1950 DEC=49D 13' 1" +/- 1" Comments: UV FLUXES KNOWN FROM IUE ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 1148c [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 1 PG1159-035 HRS ACQ 2.0 MIRROR-A2 1 30S 1 ONBOARD ACQ FOR 2, 3 CYCLE 2 /1-7 ------------------------------------------------------------------------------------------------------------------------------------ 2 ^ ^ ACCUM 2.0 G140L 1380- 15 1M ^ 1660 ------------------------------------------------------------------------------------------------------------------------------------ 3 ^ ^ ^ ^ ^ ^ ^ ^ ^ AFTER 2 BY 2D ------------------------------------------------------------------------------------------------------------------------------------ 4 BE-UMA ^ ACQ 2.0 MIRROR-A2 1 30S ^ ONBOARD ACQ FOR 5- 7 ------------------------------------------------------------------------------------------------------------------------------------ 5 ^ ^ ACCUM 2.0 G140L 1380- 15 1M 1 ZERO-PHASE 1660 JD2444998.281 +/- 0.002D PERIOD 2.291171D + /- 0.000001D PHASE 0.007 +/- Comments: ALTERNATIVE PHASE 0.989+/-.001 .001 ------------------------------------------------------------------------------------------------------------------------------------ 6 ^ ^ ^ ^ ^ ^ 15 1M ^ ZERO-PHASE JD2444998.281 +/- 0.002D PERIOD 2.291171D + /- 0.000001D PHASE 0.25 +/- .06 Comments: ALTERNATIVE PHASE 0.75+/-.06 ------------------------------------------------------------------------------------------------------------------------------------ 7 ^ ^ ^ ^ ^ ^ 15 1M 1 ZERO-PHASE JD2444998.281 +/- 0.002D PERIOD 2.291171D + /- 0.000001D PHASE 0.50 +/- .06 Comments: ALL OBSERVATIONS ARE CONTINUOUS GROUP 4-7 WITHIN FOR 15 MINUTES WITH READOUTS 10D EVERY 1 MIN. NOTE TIME OF 6. START TIMES ARE GIVEN, AS TWO ALTERNATIVES ACCURATE TO ~5 MINUTES. ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 1148c [ 5] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HRS ^ ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACCUM ^ ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GTO/HRS ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 1.50 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR ASTROPHYSICS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category SUBLUMINOUS STARS ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 2,3; CYCLE 2 /1-7 AFTER 2 BY 2D ONBOARD ACQ FOR 5-7 ZERO-PHASE JD2444998.281 +/- 0.002D; PERIOD 2.291171D +/- 0.000001D; PHASE 0.007 +/- .001 PHASE 0.25 +/- .06 PHASE 0.50 +/- .06; GROUP 4-7 WITHIN 10D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR-A2 G140L ^ ------------------------------------------------------------------------------------------------------------------------------------ Target Names PG1159-035 BE-UMA ------------------------------------------------------------------------------------------------------------------------------------