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  • 1
    Electronic Resource
    Electronic Resource
    Runaway stars as witnesses to supernova explosions (1978)
    [s.l.] : Nature Publishing Group
    Nature 271 (1978), S. 527-528 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] From the stars that can explode as supernova, it is only the lower mass stars that burn carbon explosively5. Therefore if the above hypothesis is correct, lower mass runaways should be predominantly single, while the higher mass runaways should be predominantly binaries containing inactive compact ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/271527a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A classification scheme for pulsars (1977)
    [s.l.] : Nature Publishing Group
    Nature 270 (1977), S. 38-39 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] This distinction between the three types of pulsars has two significant implications. First, the age of a type L pulsar is not simply determinable from its spin-down rate. Pulsars in massive close binaries are born in rapid rotation like single pulsars2, but slow down rapidly3. The neutron star ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/270038a0
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  • 3
    Electronic Resource
    Electronic Resource
    On the orientation of the pulsar space velocity vector relative to the spin axis (1977)
    [s.l.] : Nature Publishing Group
    Nature 267 (1977), S. 231-231 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The supernova explosion of a rotating magnetised star would result in the ejection of double jets along the spin axis1, and only a part of the stored magnetic energy is sufficient to eject the supernova shell2. Since in real stars the field is usually not at all symmetrical between the two poles, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/267231a0
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  • 4
    Electronic Resource
    Electronic Resource
    Is Crab nebula a disrupted helium star? (1979)
    [s.l.] : Nature Publishing Group
    Nature 277 (1979), S. 116-116 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Arnett has pointed out that the overabundance of helium with respect to hydrogen in the Crab filaments2 is compatible with a presupernova helium core of mass 4 M0 (rf. 3) which corresponds to a main sequence mass of 12 M (rf. 4). Chevalier5, on examining old Chinese records, present day nebula and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/277116a0
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  • 5
    Electronic Resource
    Electronic Resource
    Adiabatic pulsations and convective instability of uniformly rotating gaseous masses (1974)
    Springer
    Astrophysics and space science 26 (1974), S. 271-287 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Third-order virial equations are used to investigate the oscillations and the stability of the sequence of uniformly rotating compressible Maclaurin spheroids, referred to in an inertial frame. It is seen that in the case of the oscillations belonging to the third harmonics, the frequency spectrum of the Maclaurin sequence referred to in an inertial frame is distinct from the spectrum of the Maclaurin sequence considered stationary in a rotating frame of reference. Considering the Maclaurin sequence in an inertial frame, the neutral point and the point of onset of dynamical instability (corresponding to the third harmonic deformations) are isolated. They occur for the values of the eccentricitye=0.73113 and 0.96696, respectively. The neutral point is the analogue of the first point of bifurcation along the Dedekind sequence of ellipsoids and is distinct from the neutral point (e=0.89926) along the Maclaurin sequence considered stationary in a rotating frame; this latter point is the analogue of the first point of bifurcation along the Jacobian sequence. Both the Maclaurin sequences in an inertial frame and in a rotating frame become, however, dynamically unstable for the same eccentricitye=0.96696.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645611
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  • 6
    Electronic Resource
    Electronic Resource
    The secular instability of slightly viscous magnetic Maclaurin spheroids (1983)
    Springer
    Astrophysics and space science 96 (1983), S. 447-449 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We show that the instability induced by viscosity, at the point of bifurcation where the Jacobi ellipsoids branch off from the sequence of Maclaurin spheroids, is not inhibited by the presence of a magnetic field. It has already been shown that a toroidal magnetic field leaves the point of bifurcation unaffected, whereas a magnetic field along the axis of rotation pushes the point of bifurcation to eccentricities higher than the value that obtains in the absence of a magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651687
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  • 7
    Electronic Resource
    Electronic Resource
    A model for the millisecond pulsar PSR 1937+214 (1984)
    Springer
    Astrophysics and space science 98 (1984), S. 201-202 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We suggest a model for the millisecond pulsar 1937+214, according to which the immediate progenitor of the pulsar was a binary consisting of two neutron stars of unequal mass. The heavier neutron star was spun up by the transfer of angular momentum from the orbit, and the lighter neutron star was tidally disrupted, leaving behind a millisecond pulsar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651961
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  • 8
    Electronic Resource
    Electronic Resource
    On the correlation between supernova occurrence and nuclear activity in elliptical galaxies (1984)
    Springer
    Astrophysics and space science 100 (1984), S. 369-379 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We show that there is a correlation between the occurrence of supernovae and nuclear activity in elliptical galaxies. Both shun a canonical elliptical and occur only in those ellipticals which accrete gas. We also show that the hypothesis that all SNI come from short-lived stars is consistent with the colour observations of elliptical galaxies. We propose that there is a class of intrisically rounder, massive, dusty, metal-rich ellipticals which produce supernovae and are more likely to contain a radio source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651612
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  • 9
    Electronic Resource
    Electronic Resource
    A correlation between ellipticity and core-strength in extended radio galaxies (1984)
    Springer
    Astrophysics and space science 102 (1984), S. 29-39 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We show that in the case extended radio sources a correlation exists between the fraction of the radio flux retained in the core component and the ellipticity of the underlying galaxy. The correlation is in the sense that stronger cores occur in flatter galaxies. It would seem that there exists a class of intrinsically rounder, redder, massive ellipticals with larger velocity dispersions and metallicities, that can form extended radio sources more efficiently. Thus the occurrence of a radio source appears to be related to the dynamical and chemical evolution of the Galaxy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651059
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  • 10
    Electronic Resource
    Electronic Resource
    On the stability of helical velocity and magnetic fields (1978)
    Springer
    Astrophysics and space science 55 (1978), S. 395-400 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper we study the stability of an infinitely conducting, incompressible, inviscid infinite cylinder with non-parallel helical velocity and magnetic field. It is shown that the system is stable if the energy in the φ-component of the velocity field is larger than that in the φ-component of the magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642266
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