ASPCS
 
Back to Volume
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.
Back to Volume