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  • 1990-1994  (2)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    The IRIS sodium cell instrument (1991)
    Springer
    Solar physics 133 (1991), S. 13-30 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the framework of the IRIS programme, full-disk solar Doppler-shift measurements are made with an optical resonance sodium cell spectrophotometer, a new pattern of the instrument successfully used at the geographic South Pole 10 years ago. After many successive improvements, the IRIS version has now become a precise and reliable device, being limited only by the solar and/or by the atmospheric noise in all the frequency ranges of interest for the p-mode and the g-mode investigation. This instrument is described here in some detail, with the technical specification for each individual component being defined by comparison to the photon and the solar noise.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00149819
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Break-up of quasi-periodic motion as an interpretation of white-dwarf variability (1992)
    Springer
    Astrophysics and space science 188 (1992), S. 137-142 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High-speed photometric data obtained for a number of white-dwarf stars confirm the presence of subharmonic frequency in their power spectra. As many of these white dwarfs show multiperiodic structures, we show that the break up of quasi-periodic motion results in the appearance of similar subharmonic components in their spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642930
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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