Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 1102c Report Date: 09-May-96:16:09 Version: ********** Check-in Date: ********** 1.Proposal Title: ULTRAVIOLET LIGHT AND POLARIZATION VARIATIONS IN BETA CEPHEI STARS ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Proposal Type 5. Continuation ID STELLAR ASTROPHYSICS GTO/HSP Sub Category ------------------------------------------------------------------------------------ 6. Principal Investigator Institution Country Telephone Robert C. Bless WISCONSIN, UNIVERSITY OF USA 608-262-1715 ------------------------------------------------------------------------------------ 7. Abstract The variability of certain B stars such as Beta Cephei has been known for many years. No accepted mechanism for the excitation of this variation has been found, and uncertainty exists as to whether the pulsation modes are radial or nonradial. Color and polarization data in the UV will be obtained in an attempt to identify pulsation modes and phases of temperature and other variation for a selection of Beta Cephei stars. Better constraints on stellar pulsation models and the Beta Cephei phenomenon are the overall goal. Revision History: Received on RPS 9/1/89; Added to SCCS 9/5/89 Updated to V2 prop instr; RPSS V7.2 remote & local; Small syntactical Changes; Added coordinate uncertainties - SALM 9/13/89; Reduce repeats - SALM 3/5/90; Added ACQ to REPEATs; broke up DEFINE sequence - SALM 6/28/90; Added datafmt ANALOG to ACQ - SALM 7/12/90; Addition of exposure time for POL observations --BJW 8/19/90; ------------------------------------------------------------------------------------ 8. Scientific Key Words: BETA CEPHEI STARS, STELLAR PULSATION ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 11.00 par: 0 10. Num targs pri: 1 par: 0 ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 1102c PI: Robert C. Bless Proposal Title: ULTRAVIOLET LIGHT AND POLARIZATION VARIATIONS IN BETA CEPHEI STARS ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ Edward L. Robinson TEXAS, UNIVERSITY OF USA Robert C. Bless WISCONSIN, UNIVERSITY OF USA G. W. Van Citters NATIONAL SCIENCE FOUNDATION USA Joseph F. Dolan NASA, GODDARD SPACE FLIGHT USA CENTER James L. Elliot MASSACHUSETTS INSTITUTE OF USA TECHNOLOGY ------------------------------------------------------------------------------------ 3. Description of proposed observations. Polarization measurements at 2160 A and 3270 A and intensity measurements at 2400 A 5510 A will be obtained over the period of 2 Beta Cephei stars. All exposures during Cycle 1. ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. Both light and polarization amplitude will be larger in the UV for these hot stars. ST and the HSP will provide luminosity, polarization, and temperature variations far better than would ground-based observations. Typical visual amplitudes are 0.03 mag. UV amplitudes are a factor of 2 or 3 larger. ------------------------------------------------------------------------------------ 13. Color and polarization data in the UV will be obtained in an attempt to identify pulsation modes and phases of temperature and other variations for a selection of Beta Cephei stars. Better constraints on stellar pulsation models and the Beta Cephei phenomenon are the overall goal. ------------------------------------------------------------------------------------ 11. Address Information Name: ROBERT C. BLESS Category: PI Institution: UNIVERSITY OF WISCONSIN Address: WASHBURN OBSERVATORY 475 N. CHARTER STREET City: MADISON State: WI Zip Code: 53706 Country: USA Telephone: 608-262-1715 Telex (or e-mail): 265452-UOFWISC-MDS ------------------------------------------------------------------------------------ Name: G. W. VAN CITTERS Category: CON Institution: NATIONAL SCIENCE FOUNDATION Address: DIV. OF ASTRONOMICAL SCI. 1800 G STREET, N.W. City: WASHINGTON State: DC Zip Code: 20550 Country: USA Telephone: 202-357-9793 Telex (or e-mail): 892-438 ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 1102c [ 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 HD199140 BW- BETA CEPHEI STAR RA = 20H 50M 8S +/- 0.5", 1900 1 V = 6.52 VUL P = 4.8H DEC = +28D 8' +/- 0.5" ------------------------------------------------------------------------------------------------------------------------------------ 2 HD205021 BETA CEPHEI STAR RA = 21H 28M 28.6S +/- 0.5", 1985.5 1 V = 3.19 BETA-CEP P = 4.6H DEC = +70D 29' 49" +/- 0.5" ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 1102c [ 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 DEFINE # HSP/ SINGLE POL0 F216M SAMPLE-TIME=0.1 1 1M # 1 # CYCLE 1 / 1.0-11.0 POL POL ------------------------------------------------------------------------------------------------------------------------------------ 2 ^ # ^ ^ POL90 F216M ^ ^ ^ # # ------------------------------------------------------------------------------------------------------------------------------------ 3 ^ # ^ ^ POL45 F216M ^ ^ ^ # # ------------------------------------------------------------------------------------------------------------------------------------ 4 ^ # ^ ^ POL135 F216M ^ ^ ^ # # ------------------------------------------------------------------------------------------------------------------------------------ 5 ^ # ^ ^ POL0 F327M ^ ^ ^ # # ------------------------------------------------------------------------------------------------------------------------------------ 6 ^ # ^ ^ POL90 F327M ^ ^ ^ # # ------------------------------------------------------------------------------------------------------------------------------------ 7 ^ # ^ ^ POL45 F327M ^ ^ ^ # # ------------------------------------------------------------------------------------------------------------------------------------ 8 ^ # ^ ^ POL135 F327M ^ ^ ^ # # ------------------------------------------------------------------------------------------------------------------------------------ 9 DEFINE # HSP/ SINGLE 1.0 F551W ^ ^ ^ # # VIS VIS ------------------------------------------------------------------------------------------------------------------------------------ 9.9 HD199140 HSP/ ACQ DATA- 1 4S 1 ONBOARD ACQ FOR 10 POL FORMAT=ANALOG REPEAT 9.9-10.5 EVERY 20M +/- 10M FOR 8 MORE TIMES GUID TOL 0.020" / 9.9-10 ------------------------------------------------------------------------------------------------------------------------------------ 10 USE POL HD199140 X3 1000 2 1S ------------------------------------------------------------------------------------------------------------------------------------ 10.1 HD199140 HSP/ ACQ DATA- 1 4S 1 ONBOARD ACQ FOR VIS FORMAT=ANALOG 10.5 ------------------------------------------------------------------------------------------------------------------------------------ 10.5 USE VIS HD199140 1000 2 1S ------------------------------------------------------------------------------------------------------------------------------------ 10.9 HD205021 HSP/ ACQ DATA- 1 4S 1 ONBOARD ACQ FOR 11 VIS FORMAT=ANALOG ------------------------------------------------------------------------------------------------------------------------------------ 11 HD205021 HSP/ PRISM 1.0 F551W/ SAMPLE-TIME=0.1 1 5H 1000 2 VIS F240W 1S ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 1102c [ 5] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HSP/POL ^ HSP/VIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes SINGLE ^ ACQ PRISM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SAMPLE-TIME=0.1 DATA-FORMAT=ANALOG ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GTO/HSP ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 11.00 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR ASTROPHYSICS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CYCLE 1 / 1.0-11.0; ONBOARD ACQ FOR 10; REPEAT 9.9-10.5 EVERY 20M +/- 10M FOR 8 MORE TIMES; GUID TOL 0.020" / 9.9-10; ONBOARD ACQ FOR 10.5; ONBOARD ACQ FOR 11; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F216M F327M F551W F551W/F240W ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD199140 BW-VUL HD205021 BETA-CEP ------------------------------------------------------------------------------------------------------------------------------------