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  • Other Sources  (7)
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  • 1
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    Mid-infrared Spectroscopy of Planetary Nebulae (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-17
    Description: The application of infrared spectral lines observed in part of the broadened spectral range (18 to 36 microns) to planetary nebula studies is discussed. Infrared spectral lines in the mid-infrared supply information about planetary nebulae which both supplement and complement optical results. Their utility lies mainly in the insensitivity of the line intensities to temperature variations or uncertainties, in contrast to the behavior of optical emission. This in turn leads to more accurate ionic abundances than presently available from optical lines. Although densities from optical line ratios are not very sensitive to temperature, the lines are weighted toward regions of higher temperatures. A comparison with infrared densities from the same ions therefore provide clues to the density and/or temperature variations within nebulae. Temperatures from OIV and NeV ions show a part of high-excitation nebulae previously inaccessible. They verify the picture of physical processes in the HeIII zone.
    Keywords: ASTRONOMY
    Type: NASA. Ames Research Center Airborne Astron. Symp.; p 224-232
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The electron density in the galactic center as derived from the S III 18.71/33.47 micron line ratio (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: High signal-to-noise ratio measurements of the S III lines 18.71 and 33.47 microns from the galactic center, Sgr A West, are reported. The average electron density is calculated for the S III-emitting region and is found to be 1800 + or - 500 per cu cm. This value is much less than the rms electron density of the clumps as derived from radio observations. The implications for various models are discussed. The S III result is consistent with the electron density previously derived from low signal-to-noise ratio measurements of the O III lines at 88 and 52 microns, if newer values are used for the O III atomic constants.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637A); 287; L15-L18
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Functional requirements for onboard management of space shuttle consumables, volume 2. (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A study was conducted to develop the functional requirements for onboard management of space shuttle consumables. A specific consumables management concept for the space shuttle vehicle was developed and the functional requirements for the onboard portion of the concept were generated. Consumables management is the process of controlling or influencing the usage of expendable materials involved in vehicle subsystem operation. The subsystems considered in the study are: (1) propulsion, (2) power generation, and (3) environmental and life support.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-134145 , TRW-22104-H002-RO-00-VOL-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Functional requirements for onboard management of space shuttle consumables, volume 1 (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A study was conducted to determine the functional requirements for onboard management of space shuttle consumables. A generalized consumable management concept was developed for application to advanced spacecraft. The subsystems and related consumables selected for inclusion in the consumables management system are: (1) propulsion, (2) power generation, and (3) environmental and life support.
    Keywords: SPACE VEHICLES
    Type: NASA-CR-134144 , TRW-22104-H001-RO-00-VOL-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Functional Requirements for Onboard Management of Space Shuttle Consumables (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: This report documents the results of the study "Functional Requirements for Onboard Management of Space Shuttle Consumables." The study was conducted for the Mission Planning and Analysis Division of the NASA Lyndon B. Johnson Space Center, Houston, Texas, between 3 July 1972 and 16 November 1973. The overall study program objective was two-fold. The first objective was to define a generalized consumable management concept which is applicable to advanced spacecraft. The second objective was to develop a specific consumables management concept for the Space Shuttle vehicle and to generate the functional requirements for the onboard portion of that concept. Consumables management is the process of controlling or influencing the usage of expendable materials involved in vehicle subsystem operation. The report consists of two volumes. Volume I presents a description of the study activities related to general approaches for developing consumable management, concepts for advanced spacecraft applications, and functional requirements for a Shuttle consumables management concept. Volume II presents a detailed description of the onboard consumables management concept proposed for use on the Space Shuttle.
    Keywords: Man/System Technology and Life Support
    Type: TRW-22104-H002-R0-00-Vol-2
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Detection of silicon in the Galactic center (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The detection of the forbidden Si II 34.815 micron line in the Galactic center region is reported. It is demonstrated that, in the case of the Galactic center, the emission arises mainly from the photodissociation region and not the shocked molecular component seen via H2, CO, and OH lines. It is also shown that significant Si II emission is not expected from the ionized gas even though the Galactic center is a rather low excitation H II region.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X); 309; L13-L16
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  • 7
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    Distribution of Si II in the Galactic center (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A map of the Galactic center region in the forbidden Si II 34.8-micron line is presented. The line emission arises from within the photodissociation region (PDR) associated with the neutral gas ring surrounding an ionized gas core confined within 2 pc of the Galactic center. Si II is a useful probe of the inner regions of the ring since it is always optically thin. The Si II data, when analyzed in conjunction with O I, C II, and molecular measurements, outlines the transition region between the PDR and the surrounding molecular cloud. The Si II emission is found to extend beyond that of the O II into the neutral gas ring. Although the interpretation is not unique, the data are consistent with a constant gas-phase abundance of silicon within the inner part of the PDR while the gaseous silicon is depleted by molecule formation in the transition region.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 330; 803-808
    Format: text
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