Accretion Disc Instabilities
نویسندگان
چکیده
منابع مشابه
Interface Modes and Their Instabilities in Accretion Disc Boundary Layers
We study global non-axisymmetric oscillation modes trapped near the inner boundary of an accretion disc. Observations indicate that some of the quasi-periodic oscillations (QPOs) observed in the luminosities of accreting compact objects (neutron stars, black holes and white dwarfs) are produced in the inner-most regions of accretion discs or boundary layers. Two simple models are considered in ...
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The existing disk instability model for dwarf nova eruptions is reviewed, in the light of recent progress in the understanding of angular momentum transport in accretion disks. It is proposed that the standard lower branch in the “S-curve” in the effective temperature-surface density plane may not exist. Rather, angular momentum transport may be suppressed in quiescence as a result of cooling. ...
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I review several problems which arise when one tries to apply the standard dwarf nova instability model to outbursts of soft X-ray transients
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I briefly review the theory of soft X–ray transient systems. Irradiation of the accretion disc faces by the central X–ray source determines both the occurrence and the nature of the outbursts, in particular forcing these to be long viscous events and producing exponential decays at short orbital periods. Soft X–ray transients constitute the majority of LMXBs, persistent systems being largely co...
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Most astrophysical sources powered by accretion onto a black hole, either of stellar mass or supermassive, when observed with hard X-rays show signs of a hot Comptonizing component in the flow, the so-called corona, with observed temperatures and optical depths lying in a narrow range (0.1τ1 and 1×109KT 3×109 K). Here we argue that these facts constitute strong supporting evidence for a magneti...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1992
ISSN: 0074-1809
DOI: 10.1017/s0074180900122193