Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 4502c Report Date: 09-May-96:19:39 Version: ********** Check-in Date: ********** 1.Proposal Title: QUASI-PERIODIC OSCILLATIONS IN AM HERCULIS BINARIES -- CYCLE 3 MEDIUM ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID HOT STARS GO Sub Category ERUPTIVE BINARIES ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Ganesar Chanmugam LOUISIANA STATE UNIVERSITY USA ------------------------------------------------------------------------------------ 7. Abstract AM Her variables are close-binary systems in which a white dwarf with a magnetic field of 20-70 MG accretes matter from a companion star. Theoretical studies of magnetically channeled accretion flows in such systems predict that the shock formed near the white dwarf should oscillate with periods of order 0.1-1 sec. Optical high -speed photometry has indeed shown the existence of such rapid, quasi-periodic oscillations in some AM Her binaries, but not in others. We will use HST to obtain UV and optical high-speed photometry of several AM Her systems, in order to explore further the nature of the oscillations, and to extend the search into the UV. This proposal is a followup to an accepted Cycle 2 program. We are proposing it for Cycle 3 in order to complete our survey of the most suitable AM Her systems during this last opportunity for HSP observations. ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 2.50 par: 0 10. Num targs pri: 4 par: 0 ------------------------------------------------------------------------------------ 11. Instruments requested: HSP ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 4502c PI: Ganesar Chanmugam Proposal Title: QUASI-PERIODIC OSCILLATIONS IN AM HERCULIS BINARIES -- CYCLE 3 MEDIUM ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Pi Ganesar Chanmugam LOUISIANA STATE UNIVERSITY USA Howard E. Bond STSCI USA ------------------------------------------------------------------------------------ 2. Scientific Justification. (See original proposal for Scientific Justification) ------------------------------------------------------------------------------------ 3. Description of proposed observations. We will use the HSP to obtain broad-band UV and optical photometry, with the aim of searching for high-frequency oscillations predicted to arise in the magnetic accretion columns of AM Her binaries. Since the predicted timescales are 0.1-1 sec, we will use an integration time of 0.05 sec for all of the observations. Two systems (AN UMa and V834 Cen) have already shown oscillations in the optical, and will be observed with HST in the UV followed immediately by optical-band observations. The remaining two targets (QQ Vul and MR Ser) do not show optical oscillations, and we will test the prediction that they will be found in the UV. We will obtain about 30 minutes of UV photometry and 15 minutes of optical photometry on AN UMa and V834 Cen. For MR Ser and QQ Vul we will obtain 30 minutes each in the UV only. All runs must be continuous (NON-INT), and the optical and UV observations must be taken one immediately after the other. ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. Theoretical studies predict that shock oscillations with periods of 0.1-1 sec at X-ray, UV, and optical wavelengths will occur in the accretion columns in AM Her binaries. The observed optical oscillations are not coherent, making recovery of the signal from optical data, inevitably contaminated with atmospheric scintillation, difficult. High-speed UV photometry cannot be done at all from the ground or with IUE, making HST a unique choice for these observations. ------------------------------------------------------------------------------------ 5. Description of special scheduling requirements. ------------------------------------------------------------------------------------ 6. Description of special calibration exposures. No special calibrations are needed. We do include a S/C mode parallel observation to assure that the guiding history is recorded at high data rate, for subsequent attempts at removing guiding jitter from the data. All runs must be uninterrupted, and should avoid terminator crossings to the extent possible. ------------------------------------------------------------------------------------ 7. Data reduction and analysis plans. (see original proposal) ------------------------------------------------------------------------------------ 8. Additional comments or special requests. (see original proposal) ------------------------------------------------------------------------------------ 9. Description of previous HST work. (See original proposal) ------------------------------------------------------------------------------------ 10. Resources to be supplied by investigator's institution(s). (See original proposal) ------------------------------------------------------------------------------------ 11. Address Information Page 3 Name: GANESAR CHANMUGAM Category: PI Institution: Louisiana State University Address: DEPARTMENT OF PHYSICS AND ASTRONOMY City: BATON ROUGE State: LA Zip Code: 70803 Country: USA Telephone: 504-388-6849 Telex (or e-mail): ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 4502c [ 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 AN-UMA A,149,153,161 PLATE-ID=01R5, J2000 1 V=14.5 RA = 11H 04M 25.70S +/- 0.7", DEC = +45D 03' 15.0" +/- 0.7" Comments: FOR EACH TARGET, V MAGNITUDE GIVEN IS MAX. STARS VARY ON TIMESCALES OF MINUTES TO MONTHS BY UP TO SEVERAL MAGNITUDES. ------------------------------------------------------------------------------------------------------------------------------------ 2 MR-SER A,149,153,161 PLATE-ID=00GM, J2000 1 V=14.9 PG1550+191 RA = 15H 52M 47.23S +/- 0.7", DEC = +18D 56' 27.6" +/- 0.7" Comments: FOR EACH TARGET, V MAGNITUDE GIVEN IS MAX. STARS VARY ON TIMESCALES OF MINUTES TO MONTHS BY UP TO SEVERAL MAGNITUDES. ------------------------------------------------------------------------------------------------------------------------------------ 3 QQ-VUL A,149,153,161 PLATE-ID=00FF, J2000 1 V=14.5 H2003+225 RA = 20H 05M 41.94S +/- 0.7", DEC = +22D 39' 59.1" +/- 0.7" Comments: FOR EACH TARGET, V MAGNITUDE GIVEN IS MAX. STARS VARY ON TIMESCALES OF MINUTES TO MONTHS BY UP TO SEVERAL MAGNITUDES. ------------------------------------------------------------------------------------------------------------------------------------ 4 V834-CEN A,149,153,161 PLATE-ID=02MC, J2000 1 V=14.2 RA = 14H 09M 07.48S +/- 0.7", DEC = -45D 17' 17.0" +/- 0.7" Comments: FOR EACH TARGET, V MAGNITUDE GIVEN IS MAX. STARS VARY ON TIMESCALES OF MINUTES TO MONTHS BY UP TO SEVERAL MAGNITUDES. ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 4502c [ 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 AN-UMA HSP/ ACQ DATA- 1 90S 1 1 ONBOARD ACQ FOR 2 UV2 FORMAT=WORD PCS MODE F CYCLE 3 GROUP 1,2,3,4 NO GAP Comments: THE GROUP NO GAP SPECIAL REQUIREMENT IS USED TO ASSURE THAT THE UV AND VIS RUNS ARE TAKEN AS CLOSE TOGETHER AS POSSIBLE. ------------------------------------------------------------------------------------------------------------------------------------ 2 AN-UMA HSP/ SINGLE 10.0 F140LP SAMPLE- 1 30M 1 1 PCS MODE F UV2 TIME=0.01 NON-INT PRECISION=HIGH CYCLE 3 Comments: OBSERVATION IS SENSITIVE TO JITTER; SHOULD BE SCHEDULED TO AVOID DAY-NIGHT TRANSITIONS IF POSSIBLE; OR TRANSITIONS SHOULD BE AT BEGINNING OR END OF EXPOSURE. ------------------------------------------------------------------------------------------------------------------------------------ 2.5 DARK S/C DATA NONE FORMAT=FN 1 0S 1 PAR WITH 2 CRIT OBS CYCLE 3 Comments: THE FN FORMAT IS SPECIFIED IN ORDER TO ASSURE THAT THE ENGINEERING DATA ARE RECORDED AT 32 KBPS, FOR SUBSEQUENT ATTEMPTS TO REMOVE GUIDING JITTER FROM THE HSP PHOTOMETRY ------------------------------------------------------------------------------------------------------------------------------------ 3 AN-UMA HSP/ ACQ DATA- 1 75S 1 1 ONBOARD ACQ FOR 4 VIS FORMAT=WORD PCS MODE F CYCLE 3 ------------------------------------------------------------------------------------------------------------------------------------ 4 AN-UMA HSP/ SINGLE 1.0 F400LP SAMPLE- 1 16M 1 1 PCS MODE F VIS TIME=0.01 NON-INT PRECISION=HIGH CYCLE 3 Comments: OBSERVATION IS SENSITIVE TO JITTER; SHOULD BE SCHEDULED TO AVOID DAY-NIGHT TRANSITIONS IF POSSIBLE; OR TRANSITIONS SHOULD BE AT BEGINNING OR END OF EXPOSURE. ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 4502c [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 4.5 DARK S/C DATA NONE FORMAT=FN 1 0S 1 PAR WITH 4 CRIT OBS CYCLE 3 Comments: THE FN FORMAT IS SPECIFIED IN ORDER TO ASSURE THAT THE ENGINEERING DATA ARE RECORDED AT 32 KBPS, FOR SUBSEQUENT ATTEMPTS TO REMOVE GUIDING JITTER FROM THE HSP PHOTOMETRY ------------------------------------------------------------------------------------------------------------------------------------ 5 MR-SER HSP/ ACQ DATA- 1 90S 1 1 ONBOARD ACQ FOR 6 UV2 FORMAT=WORD PCS MODE F CYCLE 3 ------------------------------------------------------------------------------------------------------------------------------------ 6 MR-SER HSP/ SINGLE 10.0 F140LP SAMPLE- 1 30M 1 1 PCS MODE F UV2 TIME=0.01 NON-INT PRECISION=HIGH CYCLE 3 Comments: OBSERVATION IS SENSITIVE TO JITTER; SHOULD BE SCHEDULED TO AVOID DAY-NIGHT TRANSITIONS IF POSSIBLE; OR TRANSITIONS SHOULD BE AT BEGINNING OR END OF EXPOSURE. ------------------------------------------------------------------------------------------------------------------------------------ 6.5 DARK S/C DATA NONE FORMAT=FN 1 0S 1 PAR WITH 6 CRIT OBS CYCLE 3 Comments: THE FN FORMAT IS SPECIFIED IN ORDER TO ASSURE THAT THE ENGINEERING DATA ARE RECORDED AT 32 KBPS, FOR SUBSEQUENT ATTEMPTS TO REMOVE GUIDING JITTER FROM THE HSP PHOTOMETRY ------------------------------------------------------------------------------------------------------------------------------------ 7 QQ-VUL HSP/ ACQ DATA- 1 90S 1 1 ONBOARD ACQ FOR 8 UV2 FORMAT=WORD PCS MODE F CYCLE 3 ------------------------------------------------------------------------------------------------------------------------------------ 8 QQ-VUL HSP/ SINGLE 10.0 F140LP SAMPLE- 1 30M 1 1 PCS MODE F UV2 TIME=0.01 NON-INT PRECISION=HIGH CYCLE 3 Comments: OBSERVATION IS SENSITIVE TO JITTER; SHOULD BE SCHEDULED TO AVOID DAY-NIGHT TRANSITIONS IF POSSIBLE; OR TRANSITIONS SHOULD BE AT BEGINNING OR END OF EXPOSURE. ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 4502c [ 7] ------------------------------------------------------------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------------------------------------------------------------ 8.5 DARK S/C DATA NONE FORMAT=FN 1 0S 1 PAR WITH 8 CRIT OBS CYCLE 3 Comments: THE FN FORMAT IS SPECIFIED IN ORDER TO ASSURE THAT THE ENGINEERING DATA ARE RECORDED AT 32 KBPS, FOR SUBSEQUENT ATTEMPTS TO REMOVE GUIDING JITTER FROM THE HSP PHOTOMETRY ------------------------------------------------------------------------------------------------------------------------------------ 9 V834-CEN HSP/ ACQ DATA- 1 90S 1 1 ONBOARD ACQ FOR 10 UV2 FORMAT=WORD PCS MODE F CYCLE 3 GROUP 9,10,11,12 NO GAP Comments: THE GROUP NO GAP SPECIAL REQUIREMENT IS USED TO ASSURE THAT THE UV AND VIS RUNS ARE TAKEN AS CLOSE TOGETHER AS POSSIBLE. ------------------------------------------------------------------------------------------------------------------------------------ 10 V834-CEN HSP/ SINGLE 10.0 F140LP SAMPLE- 1 30M 1 1 PCS MODE F UV2 TIME=0.01 NON-INT PRECISION=HIGH CYCLE 3 Comments: OBSERVATION IS SENSITIVE TO JITTER; SHOULD BE SCHEDULED TO AVOID DAY-NIGHT TRANSITIONS IF POSSIBLE; OR TRANSITIONS SHOULD BE AT BEGINNING OR END OF EXPOSURE. ------------------------------------------------------------------------------------------------------------------------------------ 10.5 DARK S/C DATA NONE FORMAT=FN 1 0S 1 PAR WITH 10 CRIT OBS CYCLE 3 Comments: THE FN FORMAT IS SPECIFIED IN ORDER TO ASSURE THAT THE ENGINEERING DATA ARE RECORDED AT 32 KBPS, FOR SUBSEQUENT ATTEMPTS TO REMOVE GUIDING JITTER FROM THE HSP PHOTOMETRY ------------------------------------------------------------------------------------------------------------------------------------ 11 V834-CEN HSP/ ACQ DATA- 1 75S 1 1 ONBOARD ACQ FOR 12 VIS FORMAT=WORD PCS MODE F CYCLE 3 ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 4502c [ 8] ------------------------------------------------------------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------------------------------------------------------------ 12 V834-CEN HSP/ SINGLE 1.0 F400LP SAMPLE- 1 16M 1 1 PCS MODE F VIS TIME=0.01 NON-INT PRECISION=HIGH CYCLE 3 Comments: OBSERVATION IS SENSITIVE TO JITTER; SHOULD BE SCHEDULED TO AVOID DAY-NIGHT TRANSITIONS IF POSSIBLE; OR TRANSITIONS SHOULD BE AT BEGINNING OR END OF EXPOSURE. ------------------------------------------------------------------------------------------------------------------------------------ 12.5 DARK S/C DATA NONE FORMAT=FN 1 0S 1 PAR WITH 12 CRIT OBS CYCLE 3 Comments: THE FN FORMAT IS SPECIFIED IN ORDER TO ASSURE THAT THE ENGINEERING DATA ARE RECORDED AT 32 KBPS, FOR SUBSEQUENT ATTEMPTS TO REMOVE GUIDING JITTER FROM THE HSP PHOTOMETRY ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 4502c [ 9] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HSP/UV2 S/C HSP/VIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ SINGLE DATA ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters DATA-FORMAT=WORD SAMPLE-TIME=0.01 PRECISION=HIGH FORMAT=FN ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GO ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 2.50 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category HOT STARS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ERUPTIVE BINARIES ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ONBOARD ACQ FOR 2; PCS MODE F; CYCLE 3; GROUP 1,2,3,4 NO GAP NON-INT; CYCLE 3 PAR WITH 2; CRIT OBS; ONBOARD ACQ FOR 4; PAR WITH 4; ONBOARD ACQ FOR 6; PAR WITH 6; ONBOARD ACQ FOR 8; PAR WITH 8; ONBOARD ACQ FOR 10; GROUP 9,10,11,12 NO GAP PAR WITH 10; ONBOARD ACQ FOR 12; PAR WITH 12; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F140LP F400LP ------------------------------------------------------------------------------------------------------------------------------------ Target Names AN-UMA MR-SER PG1550+191 QQ-VUL H2003+225 V834-CEN ------------------------------------------------------------------------------------------------------------------------------------