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  • 1
    Electronic Resource
    Electronic Resource
    The Evolution of Massive Stars with Mass Loss (1986)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 24 (1986), S. 329-375 
    Details
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.aa.24.090186.001553
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  • 2
    Electronic Resource
    Electronic Resource
    Isotopic anomalies in cosmic rays and winds from Wolf-Rayet stars: A new model
    Amsterdam : Elsevier
    Advances in Space Research 4 (1984), S. 55-65 
    Details
    ISSN: 0273-1177
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0273-1177(84)90292-8
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  • 3
    Electronic Resource
    Electronic Resource
    Consistency of Weyl's geometry as a framework for gravitation (1978)
    Springer
    Astrophysics and space science 54 (1978), S. 497-508 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent work, quoted in the introduction, concerning a scale covariant theory of gravitation and corresponding astrophysical tests, has called for a revival of the geometrical considerations put forward by Weyl half a century ago, together with a better understanding of the mathematical foundation of Weyl's geometry. The present paper is to be regarded as a contribution in that direction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00639452
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  • 4
    Electronic Resource
    Electronic Resource
    Solar neutrinos and turbulent diffusion (1981)
    [s.l.] : Nature Publishing Group
    Nature 290 (1981), S. 683-686 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The necessary and sufficient condition for the generation of turbulence has been often discussed. The presence of shear is a necessary but not sufficient condition; the Richardson criterion5 has also to be satisfied. But, when account6-8 is taken of the heat exchange between the moving fluid and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/290683a0
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  • 5
    Electronic Resource
    Electronic Resource
    Fast pulsations in a Wolf–Rayet star (1992)
    [s.l.] : Nature Publishing Group
    Nature 360 (1992), S. 320-321 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the e-mechanism, the thermodynamic cycle driving the pulsation can be described as follows. Heat is generated during the contraction of the core, thus increasing the temperature and therefore the rate of nuclear energy generation, e. The release of extra energy in turn produces expansion above ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/360320a0
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  • 6
    Electronic Resource
    Electronic Resource
    The abundance of 3He in the solar wind - A constraint for models of solar evolution (1990)
    Springer
    Solar physics 128 (1990), S. 203-215 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 3He is an intermediate product in the proton-proton chain, and standard models of the Sun predict a large bulge of enhanced 3He abundance near M r /M 0 = 0.6 in the contemporary Sun. The relatively low abundance of 3He at the solar surface, which is derived from solar wind observations, poses severe constraints to non-standard solar models. Direct measurements of the 3He abundance in the solar atmosphere are extremely difficult, whereas indirect measurements, e.g., in the solar wind, have been performed with considerable precision. The interpretation of solar wind observations with respect to solar surface abundances has been greatly improved in recent years. Abundance measurements have been performed under a large variety of solar wind conditions and refined models have been developed for the transport processes in the chromosphere and the transition region and for the processes occurring in the solar corona. From these measurements we estimate the present isotopic number ratio 3He/4He to be (4.1 ± 1.0) × 10−4 at the solar surface, corresponding to the weight abundance X 3 = (9.0 ± 2.4) × 10−5. The zero-age Main-Sequence abundance of 3He (after burning of D) might have been slightly lower (by about 10 to 20%) than the present-day value. Non-standard solar models involving mild turbulent diffusion (Lebreton and Maeder, 1987) could account for a slow secular increase of the 3He/4He ratio in the solar atmosphere. On the other hand it is difficult to reconcile models with severe mass loss as proposed by Guzik, Willson, and Brunish (1987) with this constraint. The slowing down of the solar rotation during the early Main-Sequence evolution was accompanied by stronger differential rotation probably implying a more effective mixing of the inner parts. Again, the surface abundance of 3He imposes severe limits on the evolution of the distribution of momentum within the early Sun.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00154157
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  • 7
    Electronic Resource
    Electronic Resource
    Massive single star evolution: A comparison with observations (1993)
    Springer
    Space science reviews 66 (1993), S. 349-363 
    Details
    ISSN: 1572-9672
    Keywords: Stars: evolution of ; supergiant ; Wolf-Rayet ; Galaxies: stellar content of
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We firstly examine the critical model assumptions for massive stars, in particular regarding mixing, mass loss and metallicity. The comparisons of models and observations for main sequence stars reveal some interesting problems, such as the lack of O-stars close to the zero-age sequence, the so-called helium and mass discrepancies. We emphasize that this last discrepancy was probably due to the unsafe atmosphere modelling used by spectroscopists. The comparisons for supergiants enlighten a number of most interesting problems: the He and CNO abundances in blue supergiants, the distribution of supergiants in the HR diagram and above all the variations of the blue to red number ratios with metallicity. Then, we examine the properties and chemistry of WR stars and the observations and interpretations concerning the great changes of WR numbers in galaxies of different metallicites. Finally, we emphasize the main WR filiations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00771084
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  • 8
    Electronic Resource
    Electronic Resource
    Espèces nouvelles du genre Polystoma (Monogenea) en Afrique occidentale (1970)
    Springer
    Parasitology research 35 (1970), S. 140-155 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé Les auteurs redécrivent P. mangenoti et décrivent 3 nouvelles espèces de Polystomatidae parasites d'Amphibiens anoures en Afrique occidentale. Les 4 espèces en question, voisines de P. africanum Szidat, 1932 se caractérisent par leurs dimensions générales, la morphologie des hamuli et la silhouette de l'appareil digestif. Chaque espèce de Monogène paraît en outre spécifique d'une espèce d'hôte donné. La présence d'Amphibiens appartenant au genre Afrixalus et Phrynobatrachus est nouvelle pour les Polystomatidae.
    Notes: Summary The authors redescribe P. mangenoti and describe 3 new species of Polystomatidae from frogs in West Africa. These four species related to P. africanum Szidat, 1932 are characterized by their general proportions, the shape of the hamuli and by the outline of the gut. Each species of Polystoma is specific for a given host. The presence of frogs of the genera Afrixalus and Phrynobatrachus as hosts for Polystoma is new.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00259991
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Kenntnis der Cyclopentan-1, 3-dione. 1. Mitteilung (1946)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 29 (1946), S. 120-130 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19460290118
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  • 10
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    The abundance of 3He in the solar wind - A constraint for models of solar evolution (1990)
    Springer
    Details
    Publication Date: 1990-07-01
    Print ISSN: 0038-0938
    Electronic ISSN: 1573-093X
    Topics: Physics
    Published by Springer
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