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  • 1
    Digitale Medien
    Digitale Medien
    Radioactive Dating of the Elements (1991)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 29 (1991), S. 447-497 
    Details
    ISSN: 0066-4146
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.aa.29.090191.002311
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  • 2
    Digitale Medien
    Digitale Medien
    Nucleosynthesis (1984)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Nuclear and Particle Science 34 (1984), S. 53-97 
    Details
    ISSN: 0163-8998
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.ns.34.120184.000413
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  • 3
    Digitale Medien
    Digitale Medien
    Possible transfer of lunar matter to Earth due to a nearby supernova (1980)
    [s.l.] : Nature Publishing Group
    Nature 284 (1980), S. 328-329 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] SNE models often involve a configuration in which the dense exploding stellar core is surrounded by a rather minimal atmosphere3,5. Under such circumstances, the outgoing supernova shock wave propagating through a very steep density gradient will become extremely relativistic. The hot ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/284328a0
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  • 4
    Digitale Medien
    Digitale Medien
    The Galactic Halo (1970)
    [s.l.] : Nature Publishing Group
    Nature 225 (1970), S. 710-711 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] We reconsidered this problem in connexion with our preparations for the symposium on the chemical evolution of the galaxy recently held at the California Institute of Technology in honour of the sixtieth birthday of J. L. Greenstein. This exercise was a new version of a study carried out a few ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/225710a0
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  • 5
    Digitale Medien
    Digitale Medien
    Helium Deficiency in Old Halo B Stars (1967)
    [s.l.] : Nature Publishing Group
    Nature 213 (1967), S. 871-873 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Calculations show that in old halo B stars most helium will have diffused below the photosphere and therefore will not be detected spectroscopically. This may account for the low abundances of helium observed in these ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/213871a0
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  • 6
    Digitale Medien
    Digitale Medien
    Explosive nucleosynthesis and the composition of metal-poor stars (1971)
    Springer
    Astrophysics and space science 11 (1971), S. 430-442 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The character of the nuclear abundances synthesized under explosive carbon, oxygen and silicon burning conditions is demonstrated to be dependent upon the initial metal content of the star. Specifically, for metal-poor stars, the calculated abundances both of odd-Z nuclei and of the neutron rich isotopes of even-Z nuclei are found to be substantially reduced. This odd-even effect inZ is consistent with spectral studies of metal deficient stars.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00649636
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  • 7
    Digitale Medien
    Digitale Medien
    The nature of recurrent novae (1987)
    Springer
    Astrophysics and space science 131 (1987), S. 493-495 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The observational properties and outburst histories of each member of the small class of recurrent novae are reviewed, with the objective of identifying the outburst mechanisms for these systems. Examples are found of both accretion-powered outbursts (T CrB and RS Oph) and thermonuclear-powered outbursts (T Pyx and U Sco). Outburst properties which might be used in future to distinguish between these mechanisms are identified. Many erstwhile recurrent novae (VY Aqr, RZ Leo, V616 Mon, V1195 Oph, V529 Ori, WZ Sge, and V1017 Sgr) appear to be misclassified examples of other types of cataclysmic variables.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00668132
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  • 8
    Digitale Medien
    Digitale Medien
    Electron capture in carbon dwarf supernovae (1974)
    Springer
    Astrophysics and space science 27 (1974), S. 261-291 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The rates of electron capture on heavier elements under the extreme conditions predicted for dwarf star supernovae have been computed, incorporating modifications that seem to be indicated by present experimental results. An estimate of the maximum possible value of such rates is also given. The distribution of nuclei in nuclear statistical equilibrium has been calculated for the range of expected supernovae conditions, including the effects of the temperature dependence of nuclear partition functions. These nuclide abundance distributions are then used to compute nuclear equilibrium thermodynamic properties. The effects of the electron capture on such equilibrium matter are discussed. The results of supernova numerical hydrodynamics incorporating the computed equilibrium properties and the influence of electron capture are presented. In the context of the ‘carbon detonation’ supernova model, the dwarf central density required to assure core collapse to a neutron star configuration is found to be slightly higher than that obtained by Bruenn (1972) with the electron capture rates of Hansen (1966).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00643877
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  • 9
    Digitale Medien
    Digitale Medien
    The waiting point approximation inr-process calculations (1983)
    Springer
    Astrophysics and space science 91 (1983), S. 235-243 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The steady flow approximation to ther-process has been used to evaluate the validity of the waiting point assumption (that, for a given charge numberZ, neutron captures become balanced by neutron photodisintegrations) under a variety of conditions. The criterion for the accuracy of the approximation for any set of nuclei with the same value ofZ is that the ratio of the total rate of neutron photodisintegration in those nuclei to the total rate of neutron captures should be close to unity. We have failed to find any set of conditions involving neutron production by helium thermonuclear reactions (at temperatures up to 109 K) for which the waiting point approximation is useful for all values ofZ, and we recommend that all suchr-process calculations not use this approximation. At higher temperatures, such as those characteristic of explosive carbon burning (2×109 K), the waiting point approximation is much better.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00656112
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  • 10
    Digitale Medien
    Digitale Medien
    On possible short-lived progenitors of fission xenon in carbonaceous chondrites (1975)
    Springer
    Astrophysics and space science 36 (1975), S. L1 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We suggest that the unidentified fission xenon component in carbonaceous chondrites may be attributable to the decay of the extinct radioactivities250Cm and, to a lesser extent,258Cm. Two assumptions are fundamental to this picture: (1) these relatively short-lived actinides (1.13×104 and 3.7×105 yr, respectively) were incorporated into grains in the vicinity of their supernova birthplace (prior to decay); and (2) such grains and their trapped anomalous xenon component were incorporated intact into the meteorites. Recognizing the many substantial uncertainties associated with our suggested model, we emphasize the importance of precise experimental determinations of the mass spectra of fission xenon resulting from250Cm and248Cm decay.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00681956
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