6081( 6) - 08/25/95 11:25 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6081 Version: 6 Check-in Date: ********** 1.Proposal Title: Understanding the Simplest Symbiotic System(s) ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Hot Stars GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Werner Schmutz Institute of Astronomy CoI: Urs Muerset Institute of Astronomy, ETH, Zuerich N CoI: Harry Nussbaumer Institute of Astronomy, ETH, Zuerich N CoI: Hans Schild Institute of Astronomy, ETH, Zuerich N CoI: Hans Martin Schmid Mount Stromlo and Siding Spring N Observatories CoI: Manfred Vogel Institute of Astronomy, ETH, Zuerich N CoI: Rolf Walder Institute of Astronomy, ETH, Zuerich N ------------------------------------------------------------------------------------ 6. Abstract We intend to optain pilot observations of the symbiotic system RW Hya. If the expected features are found we will propose to cover a full orbital cycle of RW Hya. RW Hya is an eclipsing system that is characterized by line profile variations that repeat with orbital phase, in the absence of outbursts, and its brightness in the UV. The GHRS observations of a few selected lines will focus on weak low density intercombination lines that are suspected to be formed in a shock zone between the two stars, on broad line wings, and on P Cygni features thought to be due to a stellar wind from the hot object. These features are too weak to be accessible by IUE. Doppler tomography of the optically thin intercombination lines and eclipse observations of the wind features will allow to locate the formation region in the binary system. The results will be used for a quantitative comparison with sophisticated hydrodynamic calculations. Preliminary results of such calculations suggest that there are 3 emitting regions: the red giant's wind ionized by the hot object, a stellar wind from the hot object, and a wind-wind shock zone located between the stars. Observational constraints are desperately needed to validate our understanding of the hydrodynamics. ------------------------------------------------------------------------------------ 6081( 6) - 08/25/95 11:25 - [ 2] Observations Description ------------------------ We plan 1 visit of the system RW Hya. The following three lines should be observed with the GHRS grating G160M using the large science aperture: NV 1240, OIV] 1400, and NIV] 1486.5. In addition, with G140L the spectrum from 1150 to 1950 is covered with three wavelength settings. The exposure time per wavelength region with G160M is 15 min and with G140L 5 min. The exposures are obtained in two consecutive orbits. Real Time Justification ----------------------- The visit should be at quadrature, approximately. This means the observation should be obtained around September 15, 1995 (see Visit_Requirements) The next quadrature is in March 1996 (not indicated under Visit_Requirements) Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 6081( 6) - 08/25/95 11:25 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD117970 STAR, SYMBIOTIC STAR, RA = 13H 34M 18.17S +/- 0.04S, J2000 V=13 V=9.79 +/- 0.23 NOVA-LIKE, INTERACTING DEC = -25D 22' 48.9" +/- 0.5", F-CONT(1400)=15+/-10 E-13 BINARY, EMISSION LINE PLATE-ID = 04LM F-LINE(1240)=60+/-60 STAR, WIND W-LINE(1240)=2+/-2 Comments: Coordinates are from GSC Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1976.417 -0.0025 0.014 0.0 6081( 6) - 08/25/95 11:25 - [ 4] Visit: 01 Visit Requirements: BETWEEN 1-MAR-1996 AND 30-MAR-1996 On Hold Comments: 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 ------------------------------------------------------------------------------------------------------------------------------------ 1 HD117970 HRS ACQ 2.0 MIRROR-N1 1 18S ONBOARD ACQ FOR 2-5 Comments: STEP-TIME=2S, EXPECT 3000 COUNTS IN STEP- TIME, UNCERTAINTY OF EXPECTED COUNTS IS LARGE: 1000 TO 20000 ------------------------------------------------------------------------------------------------------------------------------------ 2 HD117970 HRS WSCAN 2.0 G140L 1160.5- FP-SPLIT=STD, 1 1020S 1876.5 WAVE-STEP=239 Comments: S/N=50 in continuum at 1200, S/N=10 at 1900 ------------------------------------------------------------------------------------------------------------------------------------ 3 HD117970 HRS ACCUM 2.0 G140M 1484 FP-SPLIT=STD 1 1200S Comments: S/N=25 in continuum ------------------------------------------------------------------------------------------------------------------------------------ 4 HD117970 HRS ACCUM 2.0 G140M 1400 FP-SPLIT=STD 1 480S Comments: S/N=15 in continuum ------------------------------------------------------------------------------------------------------------------------------------ 5 HD117970 HRS ACCUM 2.0 G140M 1240 FP-SPLIT=STD 1 480S Comments: S/N=15 in continuum ------------------------------------------------------------------------------------------------------------------------------------ 6081( 6) - 08/25/95 11:25 - [ 5] Summary Form for Proposal 6081 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations HRS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ WSCAN ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FP-SPLIT=STD WAVE-STEP=239 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Hot Stars ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 1-MAR-1996 AND 30-MAR-1996 ONBOARD ACQ FOR 2-5 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR-N1 G140L G140M ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD117970 ------------------------------------------------------------------------------------------------------------------------------------