منابع مشابه
MHD Accretion-Ejection Flows
In this proceeding I present recent works dealing with MHD simulations describing resistive accretion disks continuously launching large-scale, self-collimated MHD jets. In particular, I discuss the physical conditions required to produce these outflows and the related numerical issues. As an illustration I also present axisymmetric MHD numerical simulations of such accretion-ejection engines, ...
متن کاملTidally distorted accretion discs in binary stars
The non-axisymmetric features observed in the discs of dwarf novae in outburst are usually considered to be spiral shocks, which are the non-linear relatives of tidally excited waves. This interpretation suffers from a number of problems. For example, the natural site of wave excitation lies outside the Roche lobe, the disc must be especially hot, and most treatments of wave propagation do not ...
متن کاملDo accretion discs regulate the rotation of young stars?
We present a photometric study of I-band variability in the young cluster IC 348. The main purpose of the study was to identify periodic stars. In all we find 50 periodic stars, of which 32 were previously unknown. For the first time in IC 348, we discover periods in significant numbers of lower-mass stars (M < 0.25M⊙) and classical T-Tauri stars. This increased sensitivity to periodicities is ...
متن کاملDo Accretion Discs Regulate the Rotation Rates of Young Stars?
The question of the early evolution of stellar angular momentum is an interesting and essentially unsolved problem. It is well known that a substantial number of young stars show spin rates well below their break-up speed [4], despite the fact that these stars should spin up as they contract towards the main sequence. Furthermore, the angular momentum distributions of older stellar clusters suc...
متن کاملThree-dimensional Mhd Simulations of Radiatively Inefficient Accretion Flows
We present three-dimensional MHD simulations of rotating radiatively inefficient accretion flows onto black holes. We continuously inject magnetized matter into the computational domain near the outer boundary and run the calculations long enough for the resulting accretion flow to reach a quasi-steady state. We have studied two limiting cases for the geometry of the injected magnetic field: pu...
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ژورنال
عنوان ژورنال: Astronomy & Geophysics
سال: 2012
ISSN: 1366-8781
DOI: 10.1111/j.1468-4004.2012.53529.x