! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template ! $Id: 5864,v 6.1 1995/06/05 15:59:08 pepsa Exp $ ! ! Refer to the HST Phase II Proposal Instructions to fill this out ! ! Anything after a "!" is ignored, and may be deleted ! ! All keywords with multiple entries are comma delimited except the ! Visit_Requirements and Special_Requirements keywords which can be ! delimited with carriage returns or semi-colons, but not commas ! ! For help call your Program Coordinator: Karla Peterson ! Phone: 410 338-4774, E-mail: peterson@stsci.edu ! ! This partially completed template was generated from your Phase I proposal. ! Proposal_Information ! Section 4 Title: MASS LOADING OF STELLAR WINDS IN HYDROGEN -POOR PLANETARY NEBULAE Proposal_Category: GO Scientific_Category: Interstellar Medium Cycle: 5 Investigators PI_name: J. Patrick Harrington PI_Institution: University of Maryland CoI_Name: Kazimierz Borkowski CoI_Institution: Goddard Space Flight Center Contact: ! Y or N (designate at most one contact) CoI_Name: Zlatan Tsvetanov CoI_Institution: Johns Hopkins University Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) HST observations of several members of the small group of PNe with hydrogen-poor ejecta have disclosed remarkable features created by the interaction of the fast winds of the central stars with the clumpy nebular gas. We can see how dense clumps of material, left within an expanding bubble blown by a stellar wind, are being photoevaporated by the stellar radiation and then swept back and accelerated by the wind. This accelerated material mixes with the wind, slowing it and increasing its density. Thus these rare PNe open a unique window on mass loading processes. We propose to extend WFPC2 imaging and GHRS spectroscopy of H-poor PNe in order to understand the interaction of a stellar wind with the inhomogeneous ambient medium, to understand the mass loading process, measure its strength, and find how nebular material is accelerated to high velocities by the stellar wind. Questions ! Free format text (please update) Observing_Description: o WFPC2 OBSERVATIONS We plan to obtain WFPC2 images in OIII Lambda5007, HeII Lambda4686 and HeI Lambda5878 of A78 as well as an H Alpha image of IRAS15154-5258. In all cases the central star will be placed in the center of the PC chip, so that all of the inner part of the PNe is imaged at the highest possible resolution. Part of the outer structure of A78 will fall onto the WFC chips (depending upon the exact orientation). Exposure times for A78 can be based our WFPC2 images of A30 in the corresponding filters. This can be done because we can see from our Cycle 2 FOC images that the nebulosity in the two objects is of comparable brightness, with the exception that the bright polar knots of A30 have no analog in A78. For A30 we used exposures of 48, 60, and 30 min for O III, He II, and He I respectively. Each of these was split into 4 parts to avoid (physical) saturation of the central star. In the case of A78, the star is a magnitude brighter, so that is not practical to break the exposures into very small bits -- we can tolerate some saturation. The intial guide star aquisition and the 30 min exposure with the He I filter will occupy the first orbit. The He II image and the O III image will then require three orbits together. Thus we require a total of four orbits for A78. Our O III image of IRAS15154-5258 (Fig. 2) required 40 min. Our ground-based spectra indicate that H Alpha is weaker than 5007Angstrom by a factor of 7. But the sensitivity of the WFPC2 is higher at H Alpha is, as is the filter transmission, so the time to reach the same counts in H Alpha would be 120 min. We feel that we can tolerate a lower S/N than we have in O III and thus we request two orbits (~ 90 min) for this object. o GHRS OBSERVATIONS We plan to observe A78 with the G140M grating of the GHRS in the vicinity of the N V Lambda1241 line. The simplest way to estimate our exposure is by comparison with our observations of the same object in the vicinity of C IV Lambda1550. That exposure was 30 min, and gave a adequate S/N (Fig. 4). From IUE spectra we know that the stellar continuum at 1241Angstrom is about 1.8 times higher than at 1550Angstrom. The sensitivity of HRS G160M is nearly the same at these two wavelengths, and the G140M sensitivity at Lambda1241 is comparable to G160M. However, the C IV exposure used the SSA, which lost half the light due to spherical aberration. Thus the new HST should be able to reach the same continuum S/N in about 9 min. However, we expect the N V absorption lines have smaller optical depths than C IV, and thus we will actually need better S/N. We propose to use the rest of the orbit, which, with target aquisition, will leave over 20 min for the exposure. Real_Time_Justification: We have made concentrated efforts to study H-poor PNe with ground-based instruments in different wavelength ranges. Many of these observations have been obtained and they are being analyzed, including optical spectroscopy, imaging and spectropolarimetric observations of IRAS 15154-5258. All H- poor objects are strong infrared emitters because of the high dust content -- we do hope to learn more about the dust in these objects once the ISO satellite becomes operational. Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number: 1 Target_Name: PK81-14D1 Alternate_Names: ABELL78 Description: ISM, PLANETARY NEBULA Position: RA=21H 35M 29.39S +/- 0.02S, ! Most common specification format is DEC=+31D 41' 46.0" +/- 0.3", ! RA=0H 0M 0.00S +/- 0S, PLATE-ID=0054 ! DEC=0D 0' 0.0" +/- 0", Equinox: 2000 RV_or_Z: V = +17 RA_PM: ! Units are seconds of time per year Dec_PM: ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux: V=13.25+/-0.01,A(V)=0.46+/-0.10, ! Include at least V and B-V SURF-LINE(5007) = 1.5 +/- 0.5 E-12, W-LINE(5007) = 0.17 +/- 0.03, SURF-LINE(4686) = 2.4 +/- 1.5 E-13, W-LINE(4686) = 0.17 +/- 0.03, SURF-LINE(5876) = 8 +/- 4 E-14, W-LINE(5876) = 0.17 +/- 0.03 Comments: Target_Number: 2 Target_Name: PK81-14D1-CENTRAL-STAR Alternate_Names: ABELL78 Description: STAR, PLANETARY NEBULA CENTRAL STAR Position: RA=21H 35M 29.39S +/- 0.02S, ! Most common specification format is DEC=+31D 41' 46.0" +/- 0.3", ! RA=0H 0M 0.00S +/- 0S, PLATE-ID=0054 ! DEC=0D 0' 0.0" +/- 0", Equinox: 2000 RV_or_Z: V = +17 RA_PM: ! Units are seconds of time per year Dec_PM: ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux: V=13.25+/-0.01,A(V)=0.46+/-0.10, F-CONT(1241)= 18 +/- 5 E-13 ! Include at least V and B-V Comments: Target_Number: 3 Target_Name: IRAS15154-5258 Alternate_Names: Description: ISM, PLANETARY NEBULA Position: RA=15H 19M 08.62S +/- 0.02S, ! Most common specification format is DEC=-53D 09' 52.2" +/- 0.3", ! RA=0H 0M 0.00S +/- 0S, PLATE-ID=00H6 Equinox: 2000 RV_or_Z: V=0 RA_PM: ! Units are seconds of time per year Dec_PM: ! Units are seconds of arc per year Epoch: Annual_Parallax: Flux: V=16.2+/-0.2, ! Include at least V and B-V SURF-LINE(6563) = 7+/-4 E-15, W-LINE(6563) = 0.17 +/- 0.03 Comments: ! This is a template for a single visit containing a single exposure ! Repeat exposure and visit blocks as needed Visits ! Section 6 Visit_Number: 1 Visit_Requirements: ! Section 7.1 On_Hold_Comments: Visit_Comments: Exposure_Number: 1 ! Section 6.5 Target_Name: PK81-14D1 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F588N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 150S Special_Requirements: ! Section 7.2 Comments: Exposure_Number: 2 ! Section 6.5 Target_Name: PK81-14D1 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F588N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 150S Special_Requirements: ! Section 7.2 Comments: Exposure_Number: 3 ! Section 6.5 Target_Name: PK81-14D1 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F588N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 500S Special_Requirements: ! Section 7.2 Comments: Exposure_Number: 4 ! Section 6.5 Target_Name: PK81-14D1 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F588N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 500S Special_Requirements: ! Section 7.2 Comments: Exposure_Number: 5 ! Section 6.5 Target_Name: PK81-14D1 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F588N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 500S Special_Requirements: END ORBIT ! Section 7.2 Comments: Exposure_Number: 6 ! Section 6.5 Target_Name: PK81-14D1 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F469N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 300S Special_Requirements: ! Section 7.2 Comments: Exposure_Number: 7 ! Section 6.5 Target_Name: PK81-14D1 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F469N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 300S Special_Requirements: ! Section 7.2 Comments: Exposure_Number: 8 ! Section 6.5 Target_Name: PK81-14D1 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F469N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 900S Special_Requirements: ! Section 7.2 Comments: Exposure_Number: 9 ! Section 6.5 Target_Name: PK81-14D1 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F469N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 700S Special_Requirements: END ORBIT ! Section 7.2 Comments: Exposure_Number: 10 ! Section 6.5 Target_Name: PK81-14D1 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F469N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: ! Section 7.2 Comments: Exposure_Number: 11 ! Section 6.5 Target_Name: PK81-14D1 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F469N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 700S Special_Requirements: ! Section 7.2 Comments: Exposure_Number: 12 ! Section 6.5 Target_Name: PK81-14D1 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F502N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 800S Special_Requirements: END ORBIT ! Section 7.2 Comments: Exposure_Number: 13 ! Section 6.5 Target_Name: PK81-14D1 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F502N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 300S Special_Requirements: ! Section 7.2 Comments: Exposure_Number: 14 ! Section 6.5 Target_Name: PK81-14D1 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F502N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 300S Special_Requirements: ! Section 7.2 Comments: Exposure_Number: 15 ! Section 6.5 Target_Name: PK81-14D1 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F502N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 900S Special_Requirements: ! Section 7.2 Comments: Exposure_Number: 16 ! Section 6.5 Target_Name: PK81-14D1 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F502N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 700S Special_Requirements: END ORBIT ! Section 7.2 Comments: Visit_Number: 2 Visit_Requirements: ! Section 7.1 On_Hold_Comments: Visit_Comments: Exposure_Number: 1 ! Section 6.5 Target_Name: PK81-14D1-CENTRAL-STAR Config: HRS Opmode: ACQ Aperture: 2.0 Sp_Element: MIRROR-N1 Wavelength: Optional_Parameters: Number_of_Iterations: 1 Time_Per_Exposure: 7.2S Special_Requirements: ONBOARD ACQ FOR 2 Comments: STEP-TIME=0.8S, EXPECT 1000 COUNTS IN STEP-TIME Exposure_Number: 2 ! Section 6.5 Target_Name: PK81-14D1-CENTRAL-STAR Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G140M Wavelength: 1241 Optional_Parameters: FP-SPLIT=STD Number_of_Iterations: 1 Time_Per_Exposure: 1305.6s Special_Requirements: END ORBIT ! Section 7.2 Comments: Visit_Number: 3 Visit_Requirements: ! Section 7.1 On_Hold_Comments: Visit_Comments: Exposure_Number: 1 ! Section 6.5 Target_Name: IRAS15154-5258 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F656N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 1100S Special_Requirements: ! Section 7.2 Comments: Exposure_Number: 2 ! Section 6.5 Target_Name: IRAS15154-5258 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F656N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 1200S Special_Requirements: END ORBIT ! Section 7.2 Comments: Exposure_Number: 3 ! Section 6.5 Target_Name: IRAS15154-5258 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F656N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 1200S Special_Requirements: ! Section 7.2 Comments: Exposure_Number: 4 ! Section 6.5 Target_Name: IRAS15154-5258 Config: WFPC2 Opmode: IMAGE Aperture: PC1 Sp_Element: F656N Wavelength: Optional_Parameters: CR-SPLIT=NO Number_of_Iterations: 1 Time_Per_Exposure: 1400S Special_Requirements: END ORBIT ! Section 7.2 Comments: Data_Distribution ! Defaults indicated; change if desired Medium: 8MM ! 8MM or 6250BPI or 1600BPI Blocking_Factor: 10 ! 10 or 1 ! Only astronomers with very old 9- ! track tape drives should consider ! a blocking factor of 1 Ship_To: PI_Address ! STSCI or PI_Address or ! PI Address from Phase I is: ! ! Department of Astronomy, ! University of Maryland, ! College Park, MD 20742 ! ! Ship_Via: UPS ! UPS (2-day) or OVERNIGHT ! Overnight shipping done at PI expense Recipient_Email: ! Needed if Ship_To: is not PI_Address ! ! Let us know what you think of this template and software! ! Please send a list of your likes and dislikes to your Program Coordinator