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  • 1
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    Spectrographic observations of comet West /1975 n/ (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The spectrum of comet West (1975 n) was recorded on March 7 and 11, 1976, in the wavelength interval from 5700 to 8200 A at an intermediate resolution. One hundred twenty-two emission lines are reported, with 78 lines having identifications with spectral features of NH2, H2O(+), C2, O I forbidden emission, and Na I.
    Keywords: ASTROPHYSICS
    Type: Astronomical Society of the Pacific; vol. 89
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    An internal velocity study of the Rosette Nebula (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Emission-line profiles of H-alpha were studied at about 700 points in the Rosette Nebula by using a multislit echelle spectrograph. Numerical analysis of the profiles indicates that variations in the line-of-sight velocity occur within the nebula, reaching about + or - 20 km/s in the inner regions. Evidence is presented that these highest velocities are more probably inward, favoring a model where the central cavity is due to a depletion resulting from rapid star formation
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 229
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A study of H-alpha velocities in NGC 1499, NGC 7000, and IC 1318B/C (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Multiple slit echelle spectrograph observations of the H-alpha emission line are used to map the radial velocities of the California Nebula (NGC 1499), the North American Nebula complex (NGC 7000 and IC 5070), and IC 1318B/C. The California Nebula is singularly constant in velocity, considering its geometry. The North American Nebula complex reflects a very simple, classical dynamical picture. The expansion discovered earlier in IC 1318B/C is confirmed, detailed, and the model refined. The new data, along with that in earlier papers of this series, show that stellar wind acceleration and champagne flow mechanisms both play important roles in determining the evolution of H II regions.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 269; June 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    An H-alpha velocity study of S252 (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The H II region S252 (NGC 2175) was studied by means of H-alpha radial velocities and line widths. The velocity structure appears to be dominated by the western ionization front, abutting a dense neutral cloud which is a CO source, and by symmetry abut the ionizing star. This data, together with other studies of CO, H167-alpha, and the H II radio continuum, allow construction of a model of S252. The H II model is basically a double blister formed by a luminous hot star being located between two orthogonal, elongated neutral clouds.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 273; 639-646
    Format: text
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    NASA TECHNICAL REPORTS
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