! Proposal 5884, submission 2 ! Visit 1 revised 6/5/95 ! PI: Wayne Landsman ! Received Mon Mar 27 17:10:37 EST 1995 ! From: landsman@idlastro.gsfc.nasa.gov ! Proposal 5884, submission 1 ! PI: Wayne Landsman ! Received Mon Mar 20 10:30:24 EST 1995 ! From: landsman@idlastro.gsfc.nasa.gov ! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template ! $Id: 5884,v 10.1 1995/06/09 18:56:39 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: Alice Berman ! Phone: 410 338-4462 , E-mail: aberman@stsci.edu ! ! This partially completed template was generated from a Phase I proposal. Proposal_Information ! Section 4 Title: A White Dwarf Probe of Interstellar Deuterium Proposal_Category: GO Scientific_Category: Interstellar Medium Cycle: 5 Investigators PI_name: Wayne Landsman PI_Institution: Hughes STX CoI_Name: Pierre Bergeron CoI_Institution: Universite de Montreal Contact: ! Y or N (designate at most one contact) CoI_Name: Ulysses Sofia CoI_Institution: NRC/NASA/GSFC Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) We propose to obtain GHRS echelle observations of interstellar hydrogen and deuterium toward the hot (Teff ~ 50,000 K) white dwarf HZ 43. EUV observations of HZ 43 (d = 65 pc) show it to be located in an unusually low column density direction (N(HI) ~ 6.5 * 10^17 cm^-2). Previous GHRS observations toward late-type stars have demonstrated the capability to study interstellar deuterium Ly-alpha\ in directions where the total column density is less than ~ 3 * 10^18 cm^-2. However, the derived D/H abundances toward late-type stars includes a systematic uncertainty due to the complex and poorly understood line profile of the chromospheric Ly-alpha\ emission. In contrast, the spectrum of HZ 43 has been successfully fit with a pure hydrogen model atmosphere at all wavelengths at which it has been observed. A second advantage of HZ 43 over late-type stars as a probe of the D/H abundance is its strong EUV and FUV continuum. In particular, the 504-912 Angstrom\ EUV continuum provides an independent check on the HI column density derived from Ly-alpha, and we will use the FUV continuum to observe interstellar species of small Doppler width, such as Mg II and Fe II, to resolve the velocity structure along the line of sight. Our simulations show that HZ 43 is sufficiently bright to yield a good S/N echelle spectrum at Ly-alpha, and likely provide the most unbiased estimate of D/H in the local interstellar medium. Questions ! Free format text (please update) Observing_Description: Six of our nine orbits will be dedicated to observing the Ly- alpha\ profile of HZ 43 with the echelle. We will use the large aperture to maximize the S/N. Geocoronal emission will be present but this emission is sufficiently narrow (< 0.1 Angstrom) that it can be placed entirely within the saturated interstellar core by observing at times of the year when the Earth's velocity toward HZ 43 matches the bulk velocity of the ISM toward HZ43 (~ -12 kms). To characterize the velocity and component structure we will use Ech-B to observe the Mg II Lambda2800 doublet and Fe II Lambda2382. The lines have been selected on the basis of their moderate strength (\log NfLambda (cm^-1) ~ 6.8-7.9) for the expected column density toward HZ 43. There are other moderate strength lines such as Si II Lambda1260, OI Lambda1302, Fe Lambda1608 that would be useful for studying depletions, but we defer their observations for future observing cycles. We will also obtain a medium resolution G160 spectrum at 1210 Angstrom\ to cover the entire broad (~ 30 Angstrom) white dwarf Ly-alpha\ absorption, in order to confirm the accuracy of the adopted model profile. begincenter begintabularrrrrrrrr Line & Wave & Orbit & Grating & Aper & Exp Time & S/N , NI, Ly-alpha & 1210 & 1 & G160M & SSA & 23m & 25 , Ly-alpha & 1215.7 & 2-7 & Ech- A & LSA & 275m & 22 , Mg II & 2795, 2803 & 8 & Ech-B & LSA & 40m & 25 , Fe II & 2382 & 9 & Ech-B & LSA & 43m & 25 , endtabular endcenter Real_Time_Justification: We request observations during certain times of the year (within a 4 month period) when the Earth velocity matches the bulk interstellar velocity toward HZ 43. Calibration_Justification: None. ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 ! Updated target coordinates 5/16/95 - AFB Target_Number: 1 Target_Name: HZ43 Alternate_Names: GSC1996-01402,WD1314+293 Description: STAR, DA Position: RA = 13H 16M 21.99S +/- 0.02S, DEC = 29D 05' 57.0" +/- 0.2", PLATE-ID = 002K Equinox: J2000 RV_or_Z: RA_PM: -0.0116 +/- 0.0002 ! Units are seconds of time per year Dec_PM: -0.0813 +/- 0.0095 ! Units are seconds of arc per year Epoch: 1982.387 Annual_Parallax: 0.0155 +/- 0.0034 Flux: V = 12.89, B-V = -0.10, F(1215) = 5 +/- 1 E-13, F(2382) = 4 +/- 0.5 E-13, F(2800) = 2.7 +/- 0.5 E-13 Comments: Coordinates are from GSC ! Original values: ! Position: ! RA = 13H 16M 21.994S +/- 0.01S, ! DEC = 29D 05' 57.02" +/- 0.2", ! PLATE-ID=002K ! Epoch: J1982.39 ! 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: BETWEEN 30-JUL-1995 AND 5-OCT-1995 Visit_Comments: ALSO BETWEEN 18-MAR-1996 AND 23-MAY-1996 Exposure_Number: 11 ! Section 6.5 Target_Name: HZ43 Config: HRS Opmode: ACQ Aperture: 2.0 Sp_Element: MIRROR-N1 Wavelength: Optional_Parameters: BRIGHT=RETURN Number_of_Iterations: 1 Time_Per_Exposure: 9S Special_Requirements: ONBOARD ACQ FOR 12-14 ! Section 7.2 Comments: STEP-TIME=1S; EXPECT 3700 COUNTS IN STEP-TIME Exposure_Number: 12 ! Section 6.5 Target_Name: HZ43 Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: ECH-A Wavelength: 1215.6 Optional_Parameters: FP-SPLIT=STD Number_of_Iterations: 12 Time_Per_Exposure: 652.8s Special_Requirements: Exposure_Number: 13 ! Section 6.5 Target_Name: WAVE Config: HRS Opmode: ACCUM Aperture: SC2 Sp_Element: ECH-A Wavelength: 1215.6 Optional_Parameters: SPYBAL=YES Number_of_Iterations: 1 Time_Per_Exposure: DEF Special_Requirements: Comments: WAVECAL for exposure 14, Do NOT move carrousel Exposure_Number: 14 ! Section 6.5 Target_Name: HZ43 Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: ECH-A Wavelength: 1215.6 Optional_Parameters: FP-SPLIT=STD, SPYBAL=NO Number_of_Iterations: 11 Time_Per_Exposure: 652.8s Special_Requirements: ! --- END VISIT 1 --- END VISIT 1 --- END VISIT 1 --- END VISIT 1 --- Visit_Number: 2 Visit_Requirements: ! Section 7.1 BETWEEN 30-JUL-1995 AND 5-OCT-1995 Visit_Comments: ALSO BETWEEN 18-MAR-1996 AND 23-MAY-1996 Exposure_Number: 21 ! Section 6.5 Target_Name: HZ43 Config: HRS Opmode: ACQ Aperture: 2.0 Sp_Element: MIRROR-N2 Wavelength: Optional_Parameters: BRIGHT=RETURN Number_of_Iterations: 1 Time_Per_Exposure: 1.8S ! Changed from orig. 9 seconds 6/9/95 Special_Requirements: ONBOARD ACQ FOR 22-23 ! Section 7.2 Comments: STEP-TIME=0.2S; EXPECT 11860 COUNTS IN STEP-TIME Exposure_Number: 22 ! Section 6.5 Target_Name: HZ43 Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: ECH-B Wavelength: 2382 Optional_Parameters: FP-SPLIT=STD Number_of_Iterations: 4 Time_Per_Exposure: 544s Special_Requirements: ! Section 7.2 Comments: Fe II ! Section 7.2 Exposure_Number: 23 ! Section 6.5 Target_Name: HZ43 Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: ECH-B Wavelength: 2800 Optional_Parameters: FP-SPLIT=STD Number_of_Iterations: 4 Time_Per_Exposure: 544s Special_Requirements: ! Section 7.2 Comments: Mg II ! Section 7.2 Exposure_Number: 24 ! Section 6.5 Target_Name: HZ43 Config: HRS Opmode: ACQ/PEAKUP Aperture: 0.25 Sp_Element: MIRROR-N2 Wavelength: Optional_Parameters: SEARCH-SIZE = 5 Number_of_Iterations: 1 Time_Per_Exposure: 5S ! Changed from orig. 25 sec per PI 6/9/95 Special_Requirements: ONBOARD ACQ FOR 25 Comments: STEP-TIME=0.2, EXPECT 5900 COUNTS IN STEP-TIME ! Per PI 6/9/95 Exposure_Number: 25 ! Section 6.5 Target_Name: HZ43 Config: HRS Opmode: ACCUM Aperture: 0.25 Sp_Element: G160M Wavelength: 1210 Optional_Parameters: Number_of_Iterations: 13 Time_Per_Exposure: 108.8s Special_Requirements: Comments: Ly Alpha ! Section 7.2 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: ! ! Code 681 , NASA/GSFC, Greenbelt ! , MD 20771 ! ! 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