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  • ASTRONOMY  (1)
  • LUNAR AND PLANETARY EXPLORATION  (1)
  • 1990-1994  (2)
  • 1990  (2)
  • 1
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    Unknown
    A continuing search for companions to PRG stars (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Results are presented from observations, made with the SWP spectrograph at low resolution, of Tc-deficient S and C members of the group of chemically peculiar red giant (PRG) stars, which were carried out to search for possible companions to these stars. The results support the hypothesis of Little et al. (1987) and Smith and Lambert (1987, 1988) that the chemical peculiarities of T-deficient S and MS PRG stars have arisen due to mass transfer from white dwarf companions.
    Keywords: ASTRONOMY
    Type: International Colloquium; Sept. 4-7, 1989; Montpellier; France
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Observational evidence of crystalline iron oxides on Mars (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A series of new spectral observations of Mars was obtained at Mauna Kea Observatory in the 0.4-1.0-micron wavelength range during the extremely favorable 1988 opposition, which yielded new spectral reflectance and relative reflectance data for a number of distinct spots on the Martian surface at 500-600 km spatial resolution. The new spectra revealed absorptions at 0.62-0.72 micron and at 0.81-0.94 micron, both seen clearly for the first time. These absorption features are interpreted as Fe(3+) electronic transition bands that indicate the presence of crystalline ferric oxide or hydroxide minerals on the Martian surface.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 95; 14447-14
    Format: text
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    NASA TECHNICAL REPORTS
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