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  • 1995-1999  (3)
  • 1975-1979  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Duration of the superwind phase of asymptotic giant branch stars (1997)
    [s.l.] : Nature Publishing Group
    Nature 385 (1997), S. 509-510 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Stars with masses less than 8-9 times that of the Sun (1 M0) eventually reach the asymptotic giant branch (AGB). Throughout their evolution along the AGB they lose mass through stellar winds, which increase greatly towards the ends of their lives. During this phase dust grains condense from the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/385509a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Extreme Infrared Stars Discovered in Magellanic Cloud Globular Clusters (1997)
    Springer
    Astrophysics and space science 255 (1997), S. 407-413 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report preliminary results of our systematic survey for infrared stars in the globular clusters of the Magellanic Clouds. In the course of an ISOCAM survey for AGB stars in the intermediate-age clusters, we have discovered extremely red AGB stars in NGC 419 and NGC 1978. From their colours and luminosities, they are thought to be experiencing intense mass-loss and to be in the final or superwind phase of the AGB evolution. However, they seem to be of somewhat lower luminosity than the corresponding visible AGB stars when only the mid-infrared data are taken into account. This suggests that hitherto unobserved infrared excesses may exist at longer wavelengths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1001581017746
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    ISO-SWS Observations of the Time Variability of Oxygen-righ Mira Variables (1997)
    Springer
    Astrophysics and space science 255 (1997), S. 331-337 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present the first observation of variation of the infrared spectrum of circumstellar dust emission around an oxygen-rich Mira variable star, Z Cyg, over an entire light variation cycle, based on the periodic SWS01 observations. The 10 µm and 20 µm ‘silicate features’ become stronger relative to the photospheric emission at maximum that at minimum. In addition, the relative intensity of the 10 µm to the 20 µm features increases at maximum, indicating an increase of the temperature of circumstellar dust grain. A simple model analysis suggests enhanced dust formation near the photosphere around maximum, leading to a scenario that dust nucleation may have occurred near minimum and the dust grains may have subsequently grown till maximum. The strong observed variation suggests that the variability must be taken into account in the interpretation of the infrared spectra of oxygen-rich Mira variables.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1001544025498
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Experiment on the clustering of fine particles (1979)
    Springer
    Astrophysics and space science 65 (1979), S. 103-117 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The clustering of fine particles by mutual thermal collisions is investigated experimentally. Fine particles are prepared in an argon gas atmosphere by the gas evaporation technique. Mass distributions of clusters of the particles are obtained from micrographs of specimen grids placed at different heights above the evaporating source. The cluster growth is clearly seen in the change of mass distribution with height. A comparison of the experimental results with a theoretical model indicates that the cluster of fine particles does not grow in the spherical manner usually assumed, but in a planar manner. As an important consequence of the conclusion to the primordial solar nebula, the sedimentation time of the grains sinking towards the equatorial plane of the solar disk becomes longer than the value previously adopted because of the large ratio of surface to volume of a planar cluster. This longer time should alter the scenario of the evolution of the solar system after sedimentation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643493
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    Paper (German National Licenses)
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