5412( 32) - 10/23/95 16:45 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5412 Version: 32 Check-in Date: ********** 1.Proposal Title: THE BOUNDARY LAYER-WHITE DWARF CONNECTION: CV WHITE DWARF ROTATION AND LINE FORMATION REGIONS IN THE PROTOTYPE DWARF NOVA U GEMINORUM ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle HOT STARS,ERUPTIVE BI GO 4 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: SION, EDWARD VILLANOVA UNIVERSITY CoI: HUANG, MIN VILLANOVA UNIVERSITY N CoI: SZKODY, PAULA UNIVERSITY OF WASHINGTON N CoI: LONG, KNOX S. STSCI N CoI: HORNE, KEITH UTRECHT N CoI: SPARKS, WARREN M LANL N ------------------------------------------------------------------------------------ 6. Abstract The central accreting object in compact binaries and other accreting systems is usually hidden from direct observation, enshrouded by optically thick accretion disks which are opaque to the radiation emitted by the central object as it accretes matter. In the dwarf nova U Gem the underlying white dwarf accreter is clearly exposed in the far UV during dwarf nova quiescence. By probing the white dwarf with the sensitivity and velocity resolution of GHRS, just after the deposition of mass, energy and angular momentum into its envelope by the dwarf nova outburst event and also later in quiescence, we will obtain fundamental information such as: (1) the first rate of rotation of a CV white dwarf and hence the expected temperature and extent of the boundary layer during the high accretion (dwarf nova outburst) episode; (2) the delineation of the lower temperature line formation regions associated with the rotating, average (30-40,000K), photosphere of the white dwarf from the line formation region(s) of higher temperature ion species (e.g. NV 1238,1242) (boundary layer/accretion belt or putative hot corona?) surrounding the white dwarf; (3) the velocity amplitude and hence mass and gravitational redshift of the U Gem white dwarf; (4) the possible presence of persisting (but weaker in quiescence) radiation- driven selective ion wind (5) line profile variations to test physical mech- anisms that control the flow of accreted elements and hence abundance changes (diffusion, mixing, dilution, dredgeup and ongoing accretion during quiescence). ------------------------------------------------------------------------------------ 5412( 32) - 10/23/95 16:45 - [ 2] Observations Description ------------------------ Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 5412( 32) - 10/23/95 16:45 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 U-GEM STAR,DWARF RA=7H 55M 5.29S +/- 0.150S, DEC= J2000 B-V = 0.0 +/- 5.0 E-2 NOVA,INTERACTING 22D 0' 5.67" +/- 0.15", PLATE- V = 14.5 +/- 0.1 BINARY, ID=02UF F-CONT(1300.0) = 5.0 +/- 1.0 E-13 5412( 32) - 10/23/95 16:45 - [ 4] Visit: 01 Visit Requirements: ON HOLD; PERIOD 4.2457485864H AND ZERO-PHASE 4-Dec-1961:07:45:28 On Hold Comments: TARGET OF OPPORTUNITY Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 U-GEM HRS ACQ 2.0 MIRROR-N2 BRIGHT=RETURN, 1 25S ONBOARD ACQ FOR 20-50 SEARCH-SIZE=5 Comments: EXECUTE WITHIN 7-21 DAYS AFTER PI REQUEST TO ACTIVATE THESE EXPOSURES. ------------------------------------------------------------------------------------------------------------------------------------ 20 U-GEM HRS ACCUM 2.0 G160M 1220.0- COMB=TWO, STEP- 130 13.6S NO SPLIT; PHASE 0.23 TO 0.27 1255.0 PATT=5 ------------------------------------------------------------------------------------------------------------------------------------ 30 U-GEM HRS ACCUM 2.0 G160M 1270.0- COMB=TWO, STEP- 130 13.6S NO SPLIT 1305.0 PATT=5 ------------------------------------------------------------------------------------------------------------------------------------ 40 U-GEM HRS ACCUM 2.0 G160M 1615.0- COMB=TWO, STEP- 130 13.6S NO SPLIT 1650.0 PATT=5 ------------------------------------------------------------------------------------------------------------------------------------ 50 U-GEM HRS ACCUM 2.0 G160M 1615.0- COMB=TWO, STEP- 30 13.6S NO SPLIT 1650.0 PATT=5 ------------------------------------------------------------------------------------------------------------------------------------ 5412( 32) - 10/23/95 16:45 - [ 5] Visit: 04 Visit Requirements: AFTER 01 BY 11681263S TO 14273263S; ON HOLD; PERIOD 4.2457485864H AND ZERO- PHASE 4-Dec-1961:07:45:28 On Hold Comments: TARGET OF OPPORTUNITY Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 U-GEM HRS ACQ 2.0 MIRROR-N2 BRIGHT=RETURN, 1 25S ONBOARD ACQ FOR 20-50 SEARCH-SIZE=5 ------------------------------------------------------------------------------------------------------------------------------------ 20 U-GEM HRS ACCUM 2.0 G160M 1220.0- COMB=TWO, STEP- 130 13.6S NO SPLIT; PHASE 0.73 TO 0.77 1255.0 PATT=5 ------------------------------------------------------------------------------------------------------------------------------------ 30 U-GEM HRS ACCUM 2.0 G160M 1270.0- COMB=TWO, STEP- 130 13.6S NO SPLIT 1305.0 PATT=5 ------------------------------------------------------------------------------------------------------------------------------------ 40 U-GEM HRS ACCUM 2.0 G160M 1615.0- COMB=TWO, STEP- 130 13.6S NO SPLIT 1650.0 PATT=5 ------------------------------------------------------------------------------------------------------------------------------------ 50 U-GEM HRS ACCUM 2.0 G160M 1615.0- COMB=TWO, STEP- 30 13.6S NO SPLIT 1650.0 PATT=5 ------------------------------------------------------------------------------------------------------------------------------------ 5412( 32) - 10/23/95 16:45 - [ 6] Visit: 11 Visit Requirements: PERIOD 4.2457485864H AND ZERO-PHASE 4-Dec-1961:07:45:28 On Hold Comments: TARGET OF OPPORTUNITY Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 U-GEM HRS ACQ 2.0 MIRROR-N2 BRIGHT=RETURN, 1 25S ONBOARD ACQ FOR 20-50 SEARCH-SIZE=5 Comments: EXECUTE WITHIN 7-21 DAYS AFTER PI REQUEST TO ACTIVATE THESE EXPOSURES. ------------------------------------------------------------------------------------------------------------------------------------ 20 U-GEM HRS ACCUM 2.0 G160M 1220.0- COMB=TWO, STEP- 130 13.6S NO SPLIT; PHASE 0.23 TO 0.27 1255.0 PATT=5 ------------------------------------------------------------------------------------------------------------------------------------ 30 U-GEM HRS ACCUM 2.0 G160M 1270.0- COMB=TWO, STEP- 130 13.6S NO SPLIT 1305.0 PATT=5 ------------------------------------------------------------------------------------------------------------------------------------ 40 U-GEM HRS ACCUM 2.0 G160M 1615.0- COMB=TWO, STEP- 130 13.6S NO SPLIT 1650.0 PATT=5 ------------------------------------------------------------------------------------------------------------------------------------ 50 U-GEM HRS ACCUM 2.0 G160M 1615.0- COMB=TWO, STEP- 30 13.6S NO SPLIT 1650.0 PATT=5 ------------------------------------------------------------------------------------------------------------------------------------ 5412( 32) - 10/23/95 16:45 - [ 7] Visit: 14 Visit Requirements: AFTER 11 BY 40D to 55D; PERIOD 4.2457485864H AND ZERO-PHASE 4-Dec- 1961:07:45:28 On Hold Comments: TARGET OF OPPORTUNITY Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 10 U-GEM HRS ACQ 2.0 MIRROR-N2 BRIGHT=RETURN, 1 25S ONBOARD ACQ FOR 20-50 SEARCH-SIZE=5 ------------------------------------------------------------------------------------------------------------------------------------ 20 U-GEM HRS ACCUM 2.0 G160M 1220.0- COMB=TWO, STEP- 130 13.6S NO SPLIT; PHASE 0.73 TO 0.77 1255.0 PATT=5 ------------------------------------------------------------------------------------------------------------------------------------ 30 U-GEM HRS ACCUM 2.0 G160M 1270.0- COMB=TWO, STEP- 130 13.6S NO SPLIT 1305.0 PATT=5 ------------------------------------------------------------------------------------------------------------------------------------ 40 U-GEM HRS ACCUM 2.0 G160M 1615.0- COMB=TWO, STEP- 130 13.6S NO SPLIT 1650.0 PATT=5 ------------------------------------------------------------------------------------------------------------------------------------ 50 U-GEM HRS ACCUM 2.0 G160M 1615.0- COMB=TWO, STEP- 30 13.6S NO SPLIT 1650.0 PATT=5 ------------------------------------------------------------------------------------------------------------------------------------ 5412( 32) - 10/23/95 16:45 - [ 8] Summary Form for Proposal 5412 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HRS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BRIGHT=RETURN SEARCH-SIZE=5 STEP-PATT=5 COMB=TWO ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category HOT STARS,ERUPTIVE BINARIES ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ON HOLD; PERIOD 4.2457485864H AND ZERO-PHASE 4-Dec-1961 07 45 28 ONBOARD ACQ FOR 20-50 NO SPLIT; PHASE 0.23 TO 0.27 NO SPLIT AFTER 01 BY 11681263S TO 14273263S; ON HOLD; PERIOD 4.2457485864H AND ZERO-PHASE 4-Dec-1961 07 45 28 NO SPLIT; PHASE 0.73 TO 0.77 AFTER 11 BY 40D to 55D; PERIOD 4.2457485864H AND ZERO-PHASE 4-Dec-1961 07 45 28 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR-N2 G160M ------------------------------------------------------------------------------------------------------------------------------------ Target Names U-GEM ------------------------------------------------------------------------------------------------------------------------------------