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  • ASTROPHYSICS  (7)
  • SPACECRAFT PROPULSION AND POWER  (7)
  • Lunar and Planetary Science and Exploration
  • 1985-1989  (14)
  • 1
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    Multicolor photometry of field galaxies to B = 24 (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The redshifts and colors of nearly 10,000 galaxies at galactic latitudes SA57 and SA68 were determined by photometric scans which included UV and near-IR bands, covering 0.5 sq deg of sky. Slopes were calculated for UV, IR, red and blue counts of galaxies with respect to the brightness detected. It was found that galaxies of magnitudes over 20 show increasingly greater UV excess, which may be indicative of star formation regions. Future applications of the data generated for examining galaxy clustering patterns and evolutionary scenarios are discussed.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 311; 651-679
    Format: text
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  • 2
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    Numerical studies of collapsing interstellar clouds (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Numerical simulation of the structure and evolution of interstellar clouds was conducted. Steps were taken toward an integrated treatment of the dynamical, thermal, and chemical processes entering model calculations, and a detailed study was made of radiative transfer in molecular lines to allow model predictions to be tested against empirical data. It is shown that the shapes of molecular lines are sensitive to details of the cloud structure and evolutionary state and are thus useful in inferring the cloud density, temperature, chemical composition, age, and initial conditions. The calculations have successfully reproduced and explained several observed cloud properties, including abundances of complex molecular species and the apparent depletion of CO in dense cores.
    Keywords: ASTROPHYSICS
    Type: NASA-CR-180933 , NAS 1.26:180933
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Status of high power electric propulsion technology (1988)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: The growing emphasis on very challenging missions and the anticipated availability of high power levels in space have led to renewed interest in high power electric propulsion. The status of high power electric propulsion technology and its applicability to various missions are reviewed. The major thruster and system technology issues are identified which must be addressed in a focussed program in order to assure technology readiness for these missions.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: New Mexico Univ., Transactions of the Fifth Symposium on Space Nuclear Power Systems; p 337-340
    Format: text
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  • 4
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    Static and dynamic deflection studies of the SRM aft case-nozzle joint (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The redesign of the joints on the solid rocket motor (SRM) has prompted the need for analyzing the behavior of the joints using several different types of analyses. The types of analyses performed include modal analysis, static analysis, transient response analysis, and base driving response analysis. The forces used in these analyses to drive the mathematical model include SRM internal chamber pressure, nozzle blowout and side forces, shuttle vehicle lift-off dynamics, SRM pressure transient rise curve, gimbal forces and moments, actuator gimbal loads, and vertical and radial bolt preloads. The math model represented the SRM from the aft base tangent point (1,823.95 in) all the way back to the nozzle, where a simplified, tuned nozzle model was attached. The new design used the radial bolts as an additional feature to reduce the gap opening at the aft dome/nozzle fixed housing interface.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-100373 , NAS 1.15:100373
    Format: application/pdf
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  • 5
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    Wolf-Rayet stars (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The properties and evolutionary status of WR stars are examined, reviewing the results of recent observational and theoretical investigations. Topics discussed include spectral types and line strengths, magnitudes and colors, intrinsic variability, IR and radio observations, X-ray observations, the Galactic distribution of WR stars, WR stars in other galaxies, and WR binaries. Consideration is given to the inferred masses, composition, and stellar winds of WR stars; model atmospheres; WR stars and the Galactic environment; and WR stars as a phase of stellar evolution. Diagrams, graphs, and tables of numerical data are provided.
    Keywords: ASTROPHYSICS
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  • 6
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    Photospheres of hot stars. III - Luminosity effects at spectral type 09.5 (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Hydrogen and helium line profiles with high signal-to-noise ratios were obtained for four stars of spectral type 09.5 (Alpha Cam, Xi Ori A, Delta Ori A,AE Aur) that form a sequence in luminosity: Ia, Ib, II, V. The basic stellar parameters of these stars are determined by fitting the observed line profiles of weak photospheric absorption lines with profiles from models which include the effect of radiation scattered back onto the photosphere from their stellar winds, an effect referred to as wind blanketing. For these stars, the inclusion of wind blanketing is significant only for the most luminous star, Alpha Cam, for which the effective temperature was shifted about -2000 K relative to an unblanketed model.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 340; 1073-109
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  • 7
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    Thermal instabilities in diffuse molecular clouds - Formation of molecular cloud cores (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-08-13
    Description: The stability of diffuse clouds to thermal instabilities is examined using the semiempirical cooling function derived by Tarafdar et al. (1985) for these clouds. It is found that diffuse clouds which obey such a cooling function are susceptible to thermal instability at densities n of less than about 70-80/cu cm. The growth rate for instability is large and the mass contained in unstable regions ranges from about 0.001 to 1 solar mass. It is suggested that such instabilities may trigger formation of molecular cloud cores of the type found in low-mass molecular clouds (e.g., TMC-2). Criteria for thermal instability in self-gravitating systems are also derived.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Letters (ISSN 0004-6388); 25; 4 19; 235-245
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  • 8
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    The NASA Electric Propulsion Program (1987)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The NASA OAST Propulsion, Power and Energy Division supports electric propulsion for a broad class of missions. Concepts with potential to significantly benefit or enable space exploration and exploitation are identified and advanced toward applications in the near to far term. Recent program progress in mission/system analyses and in electrothermal, ion, and electromagnetic technologies are summarized.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-TM-89856 , E-3524 , NAS 1.15:89856 , AIAA PAPER 87-1098
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  • 9
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    The NASA Electric Propulsion Program (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The NASA OAST Propulsion, Power, and Energy Division supports an electric propulsion program aimed at providing benefits to a broad class of missions. Concepts which have the potential to enable or significantly benefit space exploration and exploitation are identified and advanced toward application in the near and far term. This paper summarizes recent program progress in mission/system analysis; in electrothermal, electrostatic, and electromagnetic propulsion technologies; and in propulsion/spacecraft integration.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: International Electric Propulsion Conference; Oct 03, 1988 - Oct 06, 1988; Garmisch-Partenkirchen; Germany
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  • 10
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    The NASA Electric Propulsion Program (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The NASA OAST Propulsion, Power and Energy Division supports electric propulsion for a broad class of missions. Concepts with potential to significantly benefit or enable space exploration and exploitation are identified and advanced toward applications in the near to far term. Recent program progress in mission/system analyses and in electrothermal, ion, and electromagnetic technologies are summarized.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 87-1098
    Format: text
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