Page 1 PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID 1103c Report Date: 09-May-96:16:09 Version: ********** Check-in Date: ********** 1.Proposal Title: VISIBLE AND ULTRAVIOLET LIGHT CURVES OF SHORT PERIOD RR LYRAE-TYPE (RRS) VARIABLE 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 Almost all studies of short-period RR Lyrae stars have mentioned the possibility of small-scale fluctuations in light curves or short time-scale changes in absorption line strengths. While careful examination of high signal-to-noise ratio visible light curves has failed to confirm such behavior, fluctuations may still be detectable in the ultraviolet region. These would reflect such phenomena as shock waves generated by the pulsation in the outer stellar envelope. We propose high time resolution, high signal-to noise ratio observations of a sample of such stars to characterize the ultraviolet pulsation and investigate the pulsation effects in the upper atmosphere. Revision History: Defer to Cycle 2--BJW 12/24/91; Added comment lines concerning deferment of test until PRISM mode calibration--BJW 3/18/92; ------------------------------------------------------------------------------------ 8. Scientific Key Words: PULSATING STARS, STELLAR ATMOSPHERES, HYDRODYNAMICS ------------------------------------------------------------------------------------ 9. Est obs time (hours) pri: 6.26 par: 0 10. Num targs pri: 4 par: 0 ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------ Page 2 I. GENERAL FORM Proposal 1103c PI: Robert C. Bless Proposal Title: VISIBLE AND ULTRAVIOLET LIGHT CURVES OF SHORT PERIOD RR LYRAE-TYPE (RRS) VARIABLE STARS ------------------------------------------------------------------------------------ 1. Proposers: Proposers Institution Country ESA ------------------------------------------------------------------------------------ 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 Edward L. Robinson TEXAS, UNIVERSITY OF USA ------------------------------------------------------------------------------------ 3. Description of proposed observations. High time resolution, high signal to noise ratio light curves of short period RR Lyrae stars will be obtained in both visible and ultraviolet wavelengths. The HSP/PRISM mode will be used at 5 second time resolution. ------------------------------------------------------------------------------------ 4. Justification of need for HST observations. See Section 2 ------------------------------------------------------------------------------------ 13. Almost all studies of short-period RR Lyrae stars have mentioned the possibility of small-scale fluctuations in light curves or short time-scale changes in absorption line strengths. These would reflect such phenomena as shock waves generated by the pulsation in the outer stellar envelope. We propose high time resolution, high signal-to-noise ratio observations of a sample of such stars to characterize the ultraviolet pulsation and investigate the pulsation effects in the upper atmosphere. ------------------------------------------------------------------------------------ 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): 982-438 ------------------------------------------------------------------------------------ TARGET LIST a) Fixed Targets ID = 1103c [ 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 AI-VEL SAO RRS RA = 08H 14M 05.230S +/- 2000 1 V=6.4 219640 0.5", DEC = -44D 34' 29.931" +/- 0.5" Comments: POSREF = SAO CATALOG, WITH PM ------------------------------------------------------------------------------------------------------------------------------------ 2 SX-PHE SAO ^ RA = 23H 46M 32.728S +/- 2000 1 V=6.7 231773 0.5", DEC = -41D 34' 47.064" +/- 0.5" Comments: POSREF = SAO CATALOG, WITH PM ------------------------------------------------------------------------------------------------------------------------------------ EXPOSURE LOGSHEET ID = 1103c [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 0.5 AI-VEL HSP/ ACQ DATA- 1 4S 1 CYCLE 2 / .5-1.0 VIS FORMAT=ANALOG ONBOARD ACQ FOR 1 ------------------------------------------------------------------------------------------------------------------------------------ 1 AI-VEL HSP/ PRISM 1.0 F551W/ SAMPLE-TIME=5 1 3H 1 ^ VIS F240W Comments: PROPOSAL MAY HAVE TO BE MODIFIED DEPENDING UPON STATE OF PRISM MODE CALIBRATION. ------------------------------------------------------------------------------------------------------------------------------------ 1.5 SX-PHE HSP/ ACQ DATA- 1 4S 1 ^ CYCLE 2 / 1.5-2.0 VIS FORMAT=ANALOG ONBOARD ACQ FOR 2 ------------------------------------------------------------------------------------------------------------------------------------ 2 SX-PHE HSP/ PRISM 1.0 F551W/ SAMPLE-TIME=5 ^ 2H 1 ^ VIS F240W Comments: INTERRUPTIONS BY EARTH OCCULTATIONS SHOULD BE MINIMIZED FOR ALL EXPOSURES. PROPOSAL MAY HAVE TO BE MODIFIED DEPENDING UPON STATE OF PRISM MODE CALIBRATION. ------------------------------------------------------------------------------------------------------------------------------------ Summary Form for Proposal 1103c [ 5] Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HSP/VIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ PRISM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters DATA-FORMAT=ANALOG SAMPLE-TIME=5 ------------------------------------------------------------------------------------------------------------------------------------ Proposal for GTO/HSP ------------------------------------------------------------------------------------------------------------------------------------ S/C Hours 6.26 ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category STELLAR ASTROPHYSICS ------------------------------------------------------------------------------------------------------------------------------------ Scientific Sub-category ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements CYCLE 2 / .5-1.0; ONBOARD ACQ FOR 1; CYCLE 2 / 1.5-2.0; ONBOARD ACQ FOR 2; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F551W/F240W ------------------------------------------------------------------------------------------------------------------------------------ Target Names AI-VEL SAO 219640 SX-PHE SAO 231773 ------------------------------------------------------------------------------------------------------------------------------------