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| Paper: |
Luminosity Oscillations in Accretion Discs Around Compact Objects |
| Volume: |
330, The Astrophysics of Cataclysmic Variables and Related Objects |
| Page: |
387 |
| Authors: |
Teresi, V.; Molteni, D.; Toscano, E. |
| Abstract: |
We show that accretion disks, both in the subcritical and supercritical accretion rate regime, may exhibit significant amplitude luminosity oscillations. The luminosity time behavior has been obtained by performing a set of time-dependent 2D SPH simulations of accretion disks with different values of α and accretion rate. An explanation of this luminosity behavior is proposed in terms of limit-cycle thermal instability: the disk oscillates between a radiation pressure dominated configuration (with a high luminosity value) and a gas pressure dominated one (with a low luminosity value). We support this hypothesis showing that the limit-cycle behavior produces a sequence of collapsing and refilling states of the innermost disk region. |
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