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  • SPACE SCIENCES  (2)
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  • 1
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    Uvby-beta photometry of stars in the direction of the association Perseus OB 2. (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The interstellar absorption in the direction of association Perseus OB 2 is studied by uvby-beta photometry of 35 early-type stars in four fields. Most of the obscuration seems to be concentrated between 100 and 200 parsecs from the sun, rather than between 200 and 300 parsecs as previously suggested by Lynds (1969).
    Keywords: SPACE SCIENCES
    Type: Astronomical Society of the Pacific; vol. 83
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Observations of the stellar Mg II resonance doublet at 2795 and 2802 A. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Spectrophotometry of the Mg II resonance doublet at 2795.5 and 2802.7 A has been performed for five stars with a balloon-borne telescope and spectrometer. Spectral resolution attained was between 0.25 and 0.5 A. A description of the payload and flight operations is given. In beta Lyr the Mg II doublet displayed P Cygni characteristics, while in gamma Lyr the doublet was observed only in absorption. The star beta Cas shows broad overlapping Mg II absorption lines with possible weak emission at the line bottom. In alpha CMi, both components of the doublet are seen in emission at the bottom of the broad absorption feature. The Mg II doublet in alpha Ori is entirely in emission, with each component showing distinct self-reversal.
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 176; Aug. 15
    Format: text
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    NASA TECHNICAL REPORTS
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