Talk detail

Participant	Ikhsanov, Nazar
Institution	Pulkovo Observatory - Pulkovskoe Shosse 65-1 - Saint Petersburg - Saint Petersburg - Russia

Session	SO4	Accepted	Yes	Order	6	Time	15:30 - 15:50	15' + 5'
Talk	Oral abstract	Title	Formation and Appearance of Fast Rotating Pulsar-like White Dwarfs
Co-authors	Nina Beskrovnaya
Abstract	The problem posed by an existence of the fast rotating magnetized white dwarf AE Aquarii which operates as a spin-powered pulsar is discussed. A formation of this object is associated with a phase of extremely high mass-exchange rate which this low-mass binary system had experienced in a previous epoch. The accretion-driven spin-up of the white dwarf was accompanied with evolution of its magnetic field, which was buried during the accretion phase and re-emerged after it. The spin-down power of the white dwarf in the current epoch exceeds the bolometric luminosity of the system and is spent in the emission of electromagnetic waves and particle acceleration. The mechanisms responsible for non-thermal emission from the system detected in the radio and hard X-rays will be outlined.

Session	BH2	Accepted	Yes	Order	3	Time		20' + 3'
Talk	Oral abstract	Title	Magnetic Accretion in X-ray Pulsars
Co-authors	Lev Pustil'nik and Nina Beskrovnaya
Abstract	Several long-period accretion-powered pulsars are observed to experience rapid spin-down trends. I show that all of the conventional accretion scenarios encounter major difficulties explaining this rapid spin-down. The difficulties can be, however, avoided within the magnetic accretion scenario in which the neutron star is assumed to accrete from a magnetized wind. The magnetic pressure in the accretion flow increases more rapidly than its ram pressure and, under certain conditions, ignificantly affects the accretion picture. The accretion flow in this case switches into a slab confined by the magnetic field of the accretion flow itself. I show that the spin-down torque applied to the neutron star accreting material from the slab is comparable with the spin-down torque inferred from observations.