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  • 1970-1974  (3)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    The structure of the dense cores of Hii regions (1974)
    Springer
    Astrophysics and space science 28 (1974), S. 61-90 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The latest observational and theoretical evidence which suggests the existence of a large number of partially ionized globules (PIG's) in the cores of Hii regions is presented. The consequences of this proposition to the structure of the Orion Nebula are then considered. It is suggested that the dense ionized core of M42 is caused by two major ionization fronts eating into a large mass of neutral material which contains many dense neutral globules. The ‘Hourglass’ in M8 is shown to be very similar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642238
    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
    Electronographic measurements of the ionised helium abundance in the core of the Orion Nebula (1974)
    Springer
    Astrophysics and space science 28 (1974), S. 163-171 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements have been made with an electronographic image tube spectrograph of two helium and three hydrogen lines at twenty nine positions in the dense core of the Orion Nebula. Values for the helium abundance derived show that a large amount of the helium is neutral. This must be caused by large optical depth variations in the core near partially ionised globules (PIG's). The total abundance of helium is shown to be in the range $$0.0104〈 N(He)/N(H)〈 0.132$$ .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642245
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    High velocities and cocoon stars (1974)
    [s.l.] : Nature Publishing Group
    Nature 250 (1974), S. 397-398 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Next, consider the period of the onset of instability, when the accretion rate drops below 1022 g s?1. The false photosphere will break up in certain directions according to a time scale given approximately by the free-fall time from a radius, R (=1016 cm) to the star. That is about 1010 s. Thus, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/250397a0
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    Paper (German National Licenses)
    Fulltext
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