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  • 1
    Electronic Resource
    Electronic Resource
    Absorption of high energy heavy nuclei and γ rays at the surface of hot neutron stars (1974)
    [s.l.] : Nature Publishing Group
    Nature 248 (1974), S. 569-571 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Though pulsars are potential sources of very high energy particles and y rays, it is not clear whether the radiation can escape the pulsar environment and reach interstellar space. Various absorption processes can contribute to the destruction of these radiations. Absorption of high energy y rays ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/248569a0
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  • 2
    Electronic Resource
    Electronic Resource
    A new method for investigating the production of heavy particles in the cosmic radiation
    Amsterdam : Elsevier
    Physics Letters 17 (1965), S. 152-154 
    Details
    ISSN: 0031-9163
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9163(65)90280-5
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  • 3
    Electronic Resource
    Electronic Resource
    Shock-induced star formation in G357.7 – 0.1? (1985)
    [s.l.] : Nature Publishing Group
    Nature 317 (1985), S. 415-416 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The two radio sources have recently been studied at wavelengths of 20 cm and 6 cm using the VLA1'2. Both have unusual axial symmetry, non-thermal spectra, significant linear polarization and compact sources at one edge on the axis. The compact source near G357.7-0.1 has a flat spectrum with flux ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/317415a0
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  • 4
    Electronic Resource
    Electronic Resource
    Pulsars and the origin of cosmic rays (1975)
    Springer
    Astrophysics and space science 32 (1975), S. 55-75 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The capabilities and limitations of pulsars as sources of cosmic rays are reviewed in the light of experimental observations. Pulsars can supply the cosmic ray power if they have rotational velocities in excess of 700 rad s−1 at birth. Though this is theoretically possible, there is no experimental proof for the same. Pulsars can accelerate particles to the highest energies of 1020 eV, but in general, the spectra on simple considerations, turn out to be flatter than the observed cosmic ray spectrum. At the highest energies, absorption processes due to fragmentation and photodisintegration dominate for heavy nuclei. The existence of a steady flux of cosmic rays of energy greater than 1017 eV demands acceleration of particles to last over fifty years, the time interval between supernovae outbursts, whereas the expected period of activity is less than a few years. Finally, the problem of anisotropy with relevance to pulsars as sources and the possibility of observing pulsar accelerated particles from galactic clusters is considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00646217
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  • 5
    Electronic Resource
    Electronic Resource
    A search for a consistent model for the electromagnetic spectrum of the Crab nebula (1970)
    Springer
    Astrophysics and space science 6 (1970), S. 390-395 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An attempt is made to search for a consistent model to explain the electromagnetic spectrum of the Crab nebula (Tau A). It is assumed that there is a continuous injection of electrons at the centre of the nebula with an energy spectrumE −1.54 as evidenced by radio data. This spectrum must steepen to a slope larger than 2 at some energyE i in order to ensure that the energy input into electrons remains finite. The spectrum must also steepen beyond an energyE c depending on the magnetic field because of synchrotron energy losses. Two types of models are considered: Class I, in which the whole nebula is characterised by a uniform magnetic field, and Class II, in which besides the general fieldH 0, small filamentary regions of strong fieldH s are postulated. In models of Class I, the best fit to the observed data is obtained whenE t 〉E c andH 0≃5×10−4 gauss. However, this predicts a decrease in X-ray source size beyond ∼40 KeV. There are two possibilities of Class II model depending on the residence time of electrons in strong field regions being small or large. The former case explains the flattening in the optical spectrum. Experiments to distinguish between the various models are indicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653857
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  • 6
    Electronic Resource
    Electronic Resource
    Infrared observations of beta Cephei and delta Scuti stars (1983)
    Springer
    Astrophysics and space science 92 (1983), S. 173-176 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have made near-infrared photometric observations of nine β-Cephei and eight δ-Scuti stars inJ, H, andK bands. The observed fluxes are in good agreement with those expected according to their spectral types. We conclude that these stars do not have any anomalous emission in these near-infrared bands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653597
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  • 7
    Electronic Resource
    Electronic Resource
    Near infrared photometry of some RS CVn systems and candidates (1983)
    Springer
    Astrophysics and space science 97 (1983), S. 161-169 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Infrared observations in the J, H, and K bands were made on eleven RS CVn systems. Infrared (IR) excess ≳0.3 mag in the J, H, and K bands was observed from the three systems UX Ari, HR 1099 and σ CrB. Similar observations were also made on the RS CVn candidates HD 26354, 39937, 42449, 51268, and 86005. The IR excess in the RS CVn systems for which near infrared photometric data are available is found to be correlated with the maximum of optical wave amplitude of these systems. The observed excess cannot be explained on the basis of a single process such as: (i) emission from cool spots on the photosphere; (ii) free-free emission from an optically thin circumstellar plasma; or (iii) dust grain emission from circumstellar material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00684620
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  • 8
    Electronic Resource
    Electronic Resource
    The nature of radio emission from pulsars (1972)
    Springer
    Astrophysics and space science 17 (1972), S. 65-68 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is shown that radio emission from pulsars is unlikely to be of coherent synchrotron origin if the surface magnetic field of the central neutron star is greater than 108 G.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642542
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  • 9
    Electronic Resource
    Electronic Resource
    Path length distribution of cosmic rays from pulsar nebula complexes (1972)
    Springer
    Astrophysics and space science 19 (1972), S. 293-296 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Particles accelerated in the vicinity of pulsars have to traverse the nebular matter surrounding pulsars. Using the variation of pulsar luminosity and nebular expansion, the path length distribution for the particle radiation is deduced and compared with that obtained from experimental observation. It is found that a significant amount of matter traversed by cosmic rays can be in the source itself; but it is not possible to simultaneously account for the production of secondary electrons and secondary nuclei with the same set of parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00645714
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Infra-red emission from galactic nuclei (1971)
    Springer
    Astrophysics and space science 14 (1971), S. 460-463 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It has been suggested by several authors that the infra-red emission from galactic nuclei is due to synchrotron process from compact objects or due to thermal processes. We have examined here the coherent and incoherent synchrotron mechanisms from compact objects and find that these are unlikely to explain the observed emission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653333
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