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  • 1
    Electronic Resource
    Electronic Resource
    Twinkle, twinkle quasi star… (1982)
    [s.l.] : Nature Publishing Group
    Nature 298 (1982), S. 789-790 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] WAS our Galaxy a quasar? Could it become a quasar in the future? In a recent issue of Monthly Notes of the Royal Astronomical Society (200,247; 1982), Bailey argues that the Galaxy has indeed undergone at least one event of quasar-like activity in the recent past and may do so again. Short, active ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/298789a0
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  • 2
    Electronic Resource
    Electronic Resource
    Cataclysmic variable stars: Why does U Geminorum erupt? (1983)
    [s.l.] : Nature Publishing Group
    Nature 302 (1983), S. 12-14 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SUDDEN appearances of new stars have been reported from ancient times, and John Russell Hind was probably not too surprised when, on 15 December 1855, he found a new star in the constellation of Gemini. Just as expected from the pattern in other such observations, the nova began to fade and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/302012a0
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  • 3
    Electronic Resource
    Electronic Resource
    Accretion disks: How the wind blows (1983)
    [s.l.] : Nature Publishing Group
    Nature 305 (1983), S. 666-667 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IN a recent issue of The Astrophysical Journal (111, 70, 89; 1983) Begelman, McKee and Shields greatly extend earlier studies on coronae and winds above accretion disks. Accretion disks operate through the action of viscous stresses. Gas orbiting a compact central body gradually losses its angular ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/305666b0
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  • 4
    Electronic Resource
    Electronic Resource
    Innermost parts of accretion disks are thermally and secularly stable (1981)
    [s.l.] : Nature Publishing Group
    Nature 294 (1981), S. 235-236 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It is generally believed that the inner regions of standard, thin accretion disks are both thermally and secularly (L-E) unstable. This is because the most important stability condition, dln(T din// (D is not satisfied by any one of the possible relevant cooling mechanisms (Q) when the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/294235a0
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  • 5
    Electronic Resource
    Electronic Resource
    Runaway instability in accretion disks orbiting black holes (1983)
    [s.l.] : Nature Publishing Group
    Nature 302 (1983), S. 597-599 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We shall discuss the runaway instability using a very simple analytical model of the black hole accretion disk system. Our model is very accurate for accretion disks which take the form of slender tori and less accurate for large disks. This slender torus approximation is the only one which limits ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/302597a0
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  • 6
    Electronic Resource
    Electronic Resource
    Are there black holes in quasars? (1982)
    [s.l.] : Nature Publishing Group
    Nature 300 (1982), S. 506-507 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] One of the most important new results of the theory of accretion disks is that the observed flux of geometrically thick disks can be formally consistent with luminosities up to 100 times (but probably not much more) greater than the Eddington luminosity2"5. This is not only due to genuine ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/300506a0
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  • 7
    Electronic Resource
    Electronic Resource
    On principles (1989)
    [s.l.] : Nature Publishing Group
    Nature 339 (1989), S. 654-654 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-John Barrow (Nature 339, 170; 1989) calls into question our report (Nature 337, 411-412; 1989) on the recent conference in Venice on the anthropic principle in cosmology. We find it difficult to see that Barrow's letter accurately conveys the main thrust of his contribution to the conference. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/339654c0
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  • 8
    Electronic Resource
    Electronic Resource
    The elusive anthropic principle (1989)
    [s.l.] : Nature Publishing Group
    Nature 337 (1989), S. 411-412 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE anthropic principle is a modern attempt to deal with a question as old as mankind: why are we here? It is posed in the particular sense: why does the Universe seem to have special and very peculiar properties supporting our exist-ence? Is this by pure chance, or is there an underlying reason, a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/337411a0
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  • 9
    Electronic Resource
    Electronic Resource
    The comoving coordinate frame for differentially rotating, relativistic bodies (1976)
    Springer
    General relativity and gravitation 7 (1976), S. 371-381 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A first-order, ordinary differential equation is derived that can in principle be integrated for any assumed rotation law Ω = Ω(r) within a relativistic, perfect-fluid body. The solution of this equation reduces the number of unknown metric functions appearing in the line element for the spacetime of such differentially rotating bodies to three. In the case of rigid rotation this is equivalent to a result of Harrison.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00771107
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  • 10
    Electronic Resource
    Electronic Resource
    Optical Space of the Reissner-Nordström Solutions (1998)
    Springer
    General relativity and gravitation 30 (1998), S. 275-288 
    Details
    ISSN: 1572-9532
    Keywords: OPTICAL GEOMETRY
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present an exhaustive discussion of the embedding diagrams for the optical geometry of the Reissner-Nordström solutions. Whereas in the black hole sector there are no qualitative differences with respect to the Schwarzschild case, the diagrams are considerably different if naked singularities are present. Our treatment is sufficiently general that it can be applied also to any other static spherically symmetric spacetime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018800912591
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