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  • Other Sources  (12)
  • 1
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    The high-excitation planetary nebulae: NGC 3918 and IC 2448 (1981)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: International Ultraviolet Exploration observations of NGC 3918 and IC 2448 are presented. Combining these observations with data in the optical range and computed model structure, the chemical composition for these objects is derived. For NGC 3918 log C = -3.02, log N = -3.61 and log 0 = -3.22; while for IC 2448 log C = -3.44, log N = -81 and log 0 = 3.54.
    Keywords: ASTROPHYSICS
    Type: NASA. Goddard Space Flight Center The Universe at Ultraviolet Wavelengths: The First Two Yrs. of Intern. Ultraviolet Explorer; p 641-647
    Format: application/pdf
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  • 2
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    Recombination spectrum and reddening in NGC 1068 (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Measurements of the emission-line intensities of NGC 1068 have been made over the wavelength range extending from rest wavelengths equal to 1216 A to 1.875 micron. The data, plus other available emission-line data, can be explained in terms of a simple model where the emission lines are formed in an H II region, and the line ratios are consistent with those predicted by standard radiative recombination theory and reddening corresponding to 0.4 mag. The continuum flux is seen to consist of a galaxy component plus a nonstellar component which dominates the observed flux in the ultraviolet. The observed ultraviolet continuum does not show an absorption dip caused by the intertellar 2200 A feature nor does it contain enough energy to power the observed infrared flux.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 238
    Format: text
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  • 3
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    K-shell photoionization cross-sections. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Approximate values for the threshold energies, threshold cross sections, and energy dependence of the cross sections for K-shell photoionization are tabulated for H, He, C, N, O, Ne, Mg, Si, and S in all stages of ionization. The approximation of these data is based on the assumptions that the threshold energy is a simple function of the nuclear charge and the number of electrons present in the atom, and that the threshold values and energy dependence of the cross sections are determined only by the threshold energy.
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Astrophysical Journal; 177; Nov. 1
    Format: text
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  • 4
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    On the He(plus) triplet line intensities (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The theoretical calculations of helium triplet line strengths, including collisional enhancement, are compared to astronomical observations. Both are plotted on an I(10830)/I(5876) vs I(5876)/I(4471) plane. It appears that the theory of helium triplet line strengths agrees with present observations, and that the question of an additional depopulation mechanism for the 2 3S population is probably predicted correctly within 30%.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-127064
    Format: application/pdf
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  • 5
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    A plausible energy source and structure for quasi-stellar objects (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: If a collision of two large, massive, fast gas clouds occurs, their kinetic energy is converted to radiation in a pair of shock fronts at their interface. The resulting structure is described, and the relevance of this as a radiation source for quasi-stellar objects is considered.
    Keywords: SPACE SCIENCES
    Type: NASA-CR-126723
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  • 6
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    On the He/plus/ triplet line intensities. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Check of the adequacy of theoretical calculations of helium-triplet line strengths, including collisional enhancement, by comparing theoretical prediction with astronomical observations. It is shown that the observations of Peimbert and Torres-Peimbert (1971) and of Peimbert and Costero (1969) fit the theoretical predictions rather well, placing planetary nebulae and H II regions in separate density and temperature ranges. It appears that the theory of helium-triplet line strengths agrees with present observations.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 173; May 1
    Format: text
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  • 7
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    A plausible energy source and structure for quasi-stellar objects. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: If a collision of two large, massive, fast gas clouds occurs, their kinetic energy is converted to radiation in a pair of shock fronts at their interface. Basic constraints imposed on such a model by observations of QSOs are considered. It is shown that a very large shock area is required if such a collision process is to provide the energy for a QSO. Details regarding the anticipated spectrum are discussed together with the opacity of the neutral clouds.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 173; Apr. 1
    Format: text
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  • 8
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    Angular distribution of interstellar atomic hydrogen. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: PHYSICS, ATOMIC, MOLECULAR, AND NUCLEAR
    Type: Astronomy and Astrophysics; 20; 3, Se; Sept
    Format: text
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  • 9
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    Reduced helium abundances in nebulae (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Reduced nebular helium abundances, using capture- cascade and collisional excitation calculations
    Keywords: SPACE SCIENCES
    Type: ; 331-335. (
    Format: text
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  • 10
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    Radiative cooling of a low-density plasma (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Low density collisionally ionized plasma at equilibrium, calculating permitted, forbidden and semiforbidden radiative cooling coefficients
    Keywords: PHYSICS, PLASMA
    Type: ; ADEMIE DES SCIENCES
    Format: text
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