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  • ASTROPHYSICS  (4)
  • INSTRUMENTATION AND PHOTOGRAPHY  (4)
  • 1
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    Characteristics of the MSFC, PDS microdensitometer (1984)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: The results of several parametric studies carried out on the Marshall Space Flight Center (MSFC) Photometric Data System PDS-10 microdensitometer are summarized for the purposes of documenting the operation and limitations of the system for inhouse research and to provide a bench mark for comparison with other microdensitometers. The results are grouped into four general areas. These are: (1) system overall stability to drift, (2) photometric linearity and noise, (3) reproducibility, and (4) scanning performance. Test data taken in order to evaluate the interdependency of scan speed, noise and position are included. Shown also are results of tests for system stability, reproducibility, stray light and PMT settling time.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Marshall Space Flight Center Astron. Microdensitometry Conf.; p 71-88
    Format: text
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  • 2
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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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  • 3
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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
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  • 4
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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
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  • 5
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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
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  • 6
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    Design and development of a lunar radiometer (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Infrared radiometer for measuring lunar brightness temperature
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-X-64539
    Format: application/pdf
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  • 7
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    Measurement of heavy cosmic rays above 20 GeV/n in passive detectors - Preliminary results from JACEE-3 (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: It is pointed out that the JACEE-3 experiment combined electronic counters and an emulsion chamber to study nucleus-nucleus interactions between 20 and 100 GeV/n. In the present paper, a description is given of the use of the passive detector stack. The electronic position detectors facilitate the event location, taking into account a determination of the incident angles. CR-39 plastic plates were placed just below the proportional counters to enhance tracking accuracy. The JACEE-3 emulsion chamber consists of three parts, including the charge module, the target module, and the calorimeter module. The charge module is mainly used in track identification. The obtained results are also discussed, giving attention to event number and tracking efficiency, interaction measurements, and the inelasticity distribution.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: International Cosmic Ray Conference; Aug 22, 1983 - Sep 03, 1983; Bangalore; India
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  • 8
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    JACEE long duration balloon flights (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: JACEE balloon-borne emulsion chamber detectors are used to observe the spectra and interactions of cosmic ray protons and nuclei in the energy range 1 to 100A TeV. Experiments with long duration mid-latitude balloon flights and characteristics of the detector system that make it ideal for planned Antarctic balloon flights are discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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