! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template ! $Id: 5872,v 11.1 1995/11/20 23:26:43 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: A Search for Light Elements in Quiescent X-Ray Nova Proposal_Category: GO Scientific_Category: Hot Stars Cycle: 5 Investigators PI_name: Chris Shrader PI_Institution: NASA Goddard Space Flight Center CoI_Name: Demosthenes Kazanas CoI_Institution: NASA Goddard Space Flight Center Contact: ! Y or N (designate at most one contact) Abstract: ! Free format text (please update) We propose near-UV spectroscopic observations using the GHRS in medium res. mode to search for the presence of light elements (Be, B) in a quiescent X-ray nova. The target selected is known, from ground-based high- res. spectroscopic studies, to contain anomalous abundances of Li. The motivation for this search is to test the hypothesis that nuclear spallation reactions, driven by hadronic flux from the compact objects, presumably occurring in an accretion torus about the compact object or in the atmosphere of the secondary, are responsible for the enhanced lithium abundance. Additionally, we will attempt to characterize the charged particle environments ambient to compact objects in these systems. This information could impact a number of astrophysical problems involving charged- particle induced non-thermal emission in the vicinity of compact objects. The relative abundances of Li, Be and B , since the Li can be produced by Alpha-Alpha process while the latter require CNO nuclei as spallation targets, can provide information characterizing the production environment. The confirmation of light element production in X-ray binaries could have broader implications regarding cosmic elemental abundances and primordial nucleosynthesis. HST is the only facility with the capability to carry out this research, as the strongest line features of Be and B are in the UV, and the spectral resolution and S/N requirements are well beyond the capabilities of any other current facility. Questions ! Free format text (please update) Observing_Description: We wish to observe the source with the GHRS G270M medium resolution first order grating. We have examined laboratory tables of the vacuum UV atomic line spectra in the regions adjacent to the lined of interest. It is our assessment that due to the presence of potentially contaminating weak line, mainly of Fe ions, that the resolution of the FOS would be inadequate for these measurements. The regions of interest include the BeI transitions at Lambda 2348Angstrom and Lambda 2495Angstrom, Lambda 2650Angstrom as well as BII and BI at Lambda 2395Angstrom, Lambda 3031Angstrom and Lambda 2497Angstrom, and LiI at Lambda 2741Angstrom. The UV continuum flux at Lambda 2400Angstrom is estimated to be approximately 0.30e-15 ergs/cm**2/sec/A, by scaling (factor of 100) from the measured (i.e. no reddening correction applied) outburst fluxes of Nova Muscae 1991 (Shrader and Gonzalez-Riestra 1993). That source had a color excess of E(B -V)=0.3, which intermediate to CenX-4; E(B-V)=0.2) and A0620 -00; E(B-V)=0.4. Using the sensitivity function tabulated in Table 8-2 of the GHRS Handbook, we have estimated the exposures required to achieve S/N 6-20 per diode are 9000 seconds for CenX-4. Real_Time_Justification: None. None. Calibration_Justification: ! Move appropriate text from Real_Time_Justification Additional_Comments: Fixed_Targets ! Section 5.1 Target_Number: 1 Target_Name: CenX-4 Alternate_Names: V822Cen Description: STAR, X-ray Novae Position: RA = 14H 58M 21.90S +/- 0.08S, DEC = -31D 40' 5.6" +/- 1.0", PLATE-ID = 02J0 Equinox: J2000 RV_or_Z: V = 0.0 RA_PM: 0.0 ! Units are seconds of time per year Dec_PM: 0.0 ! Units are seconds of arc per year Epoch: 1979.314 Annual_Parallax: 0.0 Flux: V=18.0, ! Include at least V and B-V B-V=0.05 Comments: Coordinates are from a cursor placement GASP measurement by Karla Visits ! Section 6 Visit_Number: 1 Visit_Requirements: ! Section 7.1 On_Hold_Comments: Visit_Comments: Exposure_number: 1 Target_Name: CenX-4 Config: FOS/BL Opmode: ACQ/PEAK Aperture: 4.3 Sp_Element: MIRROR Wavelength: Optional_Parameters: SCAN-STEP-Y=1.23, SEARCH-SIZE-Y=3, SEARCH-SIZE-X=1 Number_of_iterations:1 Time_Per_Exposure: 15S Special_Requirements:ONBOARD ACQ FOR 2 Comments: Exposure_number: 2 Target_Name: CenX-4 Config: FOS/BL Opmode: ACQ/PEAK Aperture: 1.0 Sp_Element: MIRROR Wavelength: Optional_Parameters: SCAN-STEP-Y=0.61, SCAN-STEP-X=0.61, SEARCH-SIZE-Y=2, SEARCH-SIZE-X=6 Number_of_iterations:1 Time_Per_Exposure: 15S Special_Requirements:ONBOARD ACQ FOR 3 Comments: Exposure_number: 3 Target_Name: CenX-4 Config: FOS/BL Opmode: ACQ/PEAK Aperture: 0.5 Sp_Element: MIRROR Wavelength: Optional_Parameters: SCAN-STEP-Y=0.29, SCAN-STEP-X=0.29, SEARCH-SIZE-Y=3, SEARCH-SIZE-X=3 Number_of_iterations:1 Time_Per_Exposure: 30S Special_Requirements:ONBOARD ACQ FOR 4-7 Comments: Exposure_Number: 4 ! Section 6.5 Target_Name: CenX-4 Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G270M Wavelength: 2348 Optional_Parameters: STEP-TIME=0.2,STEP-PATT=DEF Number_of_Iterations: 6 Time_Per_Exposure: 1196.8s Special_Requirements: Exposure_Number: 5 ! Section 6.5 Target_Name: CenX-4 Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G270M Wavelength: 2348 Optional_Parameters: STEP-TIME=0.2,STEP-PATT=DEF Number_of_Iterations: 6 Time_Per_Exposure: 1196.8s Special_Requirements: Exposure_Number: 6 ! Section 6.5 Target_Name: CenX-4 Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G270M Wavelength: 2348 Optional_Parameters: STEP-TIME=0.2,STEP-PATT=DEF Number_of_Iterations: 6 Time_Per_Exposure: 1196.8s Special_Requirements: ! lambda band Number: 2 Exposure_Number: 7 ! Section 6.5 Target_Name: CenX-4 Config: HRS Opmode: ACCUM Aperture: 2.0 Sp_Element: G270M Wavelength: 3130 Optional_Parameters: STEP-PATT=DEF,STEP-TIME=0.2 Number_of_Iterations: 7 Time_Per_Exposure: 1224s Special_Requirements: 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: Chris R. Shrader, ! Code 668.1 , Greenbelt, ! MD 20771 ! ! Ship_Via: UPS ! UPS (2-day) or OVERNIGHT ! Overnight shipping done at PI expense Recipient_Email: !shrader@grossc.gsfc.nasa.gov ! 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