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  • ASTROPHYSICS  (3)
  • Aerospace Medicine
  • 1975-1979  (3)
  • 1
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    Enhanced effects of starlight on the interstellar medium (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The photodesorption of molecules and atoms from the surfaces of interstellar grains can be an important source of heating for the interstellar medium and the origin of instabilities which may separate grains and gas. For low densities, the force exerted on the grains is proportional to the gas density and independent of the radiation intensity; for high densities, it is proportional to the radiative flux and independent of the gas density. This force may act differently on grains of different sizes. The photoelectric effect may also be an efficient mechanism for the separation of gas and dust in diffuse clouds.
    Keywords: ASTROPHYSICS
    Type: NASA-CR-145707
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Search with Copernicus for ultraviolet emission lines in the planetary nebula NGC 3242 (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The high-excitation planetary nebula NGC 3242 has been observed with the ultraviolet telescope-spectrometer aboard Copernicus. Wavelength intervals corresponding to the emission lines of O VI at 1032 A, He II at 1085 A, Si III at 1206 A, and N V at 1239 A have been scanned. Upper limits to the observed fluxes are reported and compared with predicted emission-line fluxes from this object.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal; 83; Nov. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unknown
    Enhanced effects of starlight on the interstellar medium (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The photodesorption of molecules and atoms from the surfaces of interstellar grains can be an important source of heating for the interstellar medium and the origin of instabilities which may separate grains and gas. For low densities, the force exerted on the grains is proportional to the gas density and independent of the radiation intensity; for high densities, it is proportional to the radiative flux and independent of the gas density. This force may act differently on grains of different sizes. The photoelectric effect may also be an efficient mechanism for the separation of gas and dust in diffuse clouds.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 206; June 1
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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