6060( 4) - 08/01/95 12:22 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6060 Version: 4 Check-in Date: ********** 1.Proposal Title: The Structure of Nova Shells ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Interstellar Medium GO 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Michael Shara Space Telescope Science Institute CoI: Mario Livio Space Telescope Science Institute N CoI: Dina Prialnik Tel-Aviv University N CoI: Robert Williams Space Telescope Science Institute N CoI: David Zurek Space Telescope Science Institute N ------------------------------------------------------------------------------------ 6. Abstract Recent WFPC2 observations of the recurrent nova T Pyxidis show that the ejected material from the previous eruptions is neither uniform nor isotropic. Rather, the ejecta is distributed in hundreds of unresolved knots. If this result is the norm for all nova ejecta then all previous mass estimates and ejection models for nova shells are probably incorrect. Observationally determined masses of nova shells provide a very important test to the nova theory. We are proposing to use WFPC2 to determine if 1) all nova shells are in fact broken into knots, and, for the closest shells, 2) to determine the size distribution of these knots. In addition WFPC2 observations of T Pyxidis will enable us to determine whether the clumpy shell is expanding. Finally, we are asking for a reendorsement (granted in cycles 1 and 4) to observe the effects of the next eruption of T Pyx (once in a generation and now several years overdue) on its multitude of circumstellar knots. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will image the structure of three nova shells with WFPC2 using narrow-band filters corresponding to the brightest spectral features seen in shell spectra. Each nova shell will take one orbit. The total number of orbits is 3. Real Time Justification ----------------------- None Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 6060( 4) - 08/01/95 12:22 - [ 2] Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 6060( 4) - 08/01/95 12:22 - [ 3] TARGET LIST a) Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GK-PERSEUS STAR,CLASSICAL RA=3H 31M 12.004S +/- 2000 V=12.9 +/- 1.1 NOVA,SHELL 0.02S,DEC=43D 54' 15.64" +/- 0.2",PLATE-ID=003R 2 DQ-HERCULIS STAR,CLASSICAL RA=18H 7M 30.337S +/- 2000 V=14.5 +/- 0.5 NOVA,SHELL 0.02S,DEC=45D 51' 31.80" +/- 0.2",PLATE-ID=00TB 3 CP-PUPPIS STAR,CLASSICAL RA=8H 11M 46.014S +/- 0.02S,DEC= 2000 V=19.0 +/- 1.0 NOVA,SHELL -35D 21' 5.86" +/- 0.2",PLATE- ID=01IB 6060( 4) - 08/01/95 12:22 - [ 4] Visit: 01 Visit Requirements: PCS MODE Fine ORIENTation 45D TO 225D 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 GK-PERSEUS WFPC2 IMAGE WFALL F658N CR-SPLIT = 0.5, 1 1400S CR-TOLERANCE = 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 2 GK-PERSEUS WFPC2 IMAGE WFALL F656N CR-SPLIT = 0.5, 1 700S CR-TOLERANCE = 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 6060( 4) - 08/01/95 12:22 - [ 5] Visit: 02 Visit Requirements: PCS MODE Fine 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 DQ-HERCULIS WFPC2 IMAGE PC1 F658N CR-SPLIT = 0.5, 1 1200S CR-TOLERANCE = 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 2 DQ-HERCULIS WFPC2 IMAGE PC1 F656N CR-SPLIT = 0.5, 1 1000S CR-TOLERANCE = 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 6060( 4) - 08/01/95 12:22 - [ 6] Visit: 03 Visit Requirements: PCS MODE Fine 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 CP-PUPPIS WFPC2 IMAGE PC1 F656N CR-SPLIT = 0.5, 1 2400S CR-TOLERANCE = 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 6060( 4) - 08/01/95 12:22 - [ 7] Summary Form for Proposal 6060 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT = 0.5 CR-TOLERANCE = 0.0 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Interstellar Medium ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PCS MODE Fine ORIENTation 45D TO 225D PCS MODE Fine ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F658N F656N ------------------------------------------------------------------------------------------------------------------------------------ Target Names GK-PERSEUS DQ-HERCULIS CP-PUPPIS ------------------------------------------------------------------------------------------------------------------------------------