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Can disk-magnetosphere interaction models and beat frequency models for quasi-periodic oscillation in accreting X-ray pulsars be reconciled?
E. Bozzo, L. Stella, M. Vietri +1
In this paper we review some aspects of the theory of magnetic threaded disks. We discuss in particular the equations that determine the position of the inner disk boundary by usin…
IGRJ16479-4514: the first eclipsing supergiant fast X-ray transient?
E. Bozzo, L. Stella, G. Israel +2
Supergiant fast X-ray transients are a new class of high mass X-ray binaries recently discovered with INTEGRAL. Hours long outbursts from these sources have been observed on numero…
Are There Magnetars in High Mass X-ray Binaries? The Case of SuperGiant Fast X-Ray Transients
E. Bozzo, M. Falanga, L. Stella
In this paper we survey the theory of wind accretion in high mass X-ray binaries hosting a magnetic neutron star and a supergiant companion. We concentrate on the different types o…
On the maximum efficiency of the propeller mass-ejection mechanism
M. Falanga, E. Bozzo, L. Stella +3
Aims. We derive simple estimates of the maximum efficiency with which matter can be ejected by the propeller mechanism in disk-fed, rotating magnetic neutron stars. Some binary evo…
On the spin-up/spin-down transitions in accreting X-ray binaries
Rosalba Perna, Enrico Bozzo, Luigi Stella
Accreting X-Ray Binaries display a wide range of behaviours. Some of them are observed to spin up steadily, others to alternate between spin-up and spin-down states, sometimes supe…