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We investigate the spin-period evolutions of recycled pulsars in binary accreting systems. Taking both the accretion induced field decay and spin-up into consideration, we calculate their spin-period evolutions influenced by the initial…

高能天体物理现象 · 物理学 2015-05-20 J. Wang , C. M. Zhang , Y. H. Zhao , Y. Kojima , H. X. Yin , L. M. SOng

The spin behaviour of the neutron star in the newly discovered young Be/X-ray long-period pulsar SXP 1062 is discussed. The star is observed to rotate with the period of 1062s, and spin-down at the rate ~ - 2.6 \times 10^{-12} Hz s^{-1}. I…

高能天体物理现象 · 物理学 2012-07-24 N. R. Ikhsanov

We study the evolution of a low mass x-ray binary coupling a binary stellar evolution code with a general relativistic code that describes the behavior of the neutron star. We assume the neutron star to be low--magnetized (B~10^8 G). In the…

天体物理学 · 物理学 2009-11-10 G. Lavagetto , L. Burderi , F. D'Antona , T. Di Salvo , R. Iaria , N. R. Robba

We compare the stellar wind torque calculated in a previous work (Paper II) to the spin-up and spin-down torques expected to arise from the magnetic interaction between a slowly rotating ($\sim 10$% of breakup) pre-main-sequence star and…

天体物理学 · 物理学 2009-11-13 Sean Matt , Ralph E. Pudritz

In this paper we present calculations of period distribution for old accreting isolated neutron stars (INSs). At the age about a few billions years low velocity INSs come to the stage of accretion. At that stage their period evolution is…

天体物理学 · 物理学 2007-05-23 S. B. Popov , M. E. Prokhorov , A. V. Khoperskov , V. M. Lipunov

The discovery of the ultraluminous X-ray pulsar M82 X-2 has stimulated lively discussion on the nature of the accreting neutron star. In most of the previous studies the magnetic field of the neutron star was derived from the observed…

高能天体物理现象 · 物理学 2017-04-12 Kun Xu , Xiang-Dong Li

The nature of the 5-12 s "anomalous" X-ray pulsars remains a mystery. Among the models that have been proposed to explain the properties of AXPs, the most likely ones are: (1) isolated accreting neutron stars evolved from the…

天体物理学 · 物理学 2009-10-31 X. -D. Li

We study properties of luminous X-ray pulsars using a simplified model of the accretion column. The maximal possible luminosity is calculated as a function of the neutron star (NS) magnetic field and spin period. It is shown that the…

高能天体物理现象 · 物理学 2015-12-31 Alexander A. Mushtukov , Valery F. Suleimanov , Sergey S. Tsygankov , Juri Poutanen

Accreting pulsars power relativistic jets, and display a complex spin phenomenology. These behaviours may be closely related to the large-scale configuration of the star's magnetic field, shaped by its interaction with the surrounding…

高能天体物理现象 · 物理学 2017-06-21 Kyle Parfrey , Anatoly Spitkovsky , Andrei M. Beloborodov

Accretion disks are ubiquitous in the universe and it is generally accepted that magnetic fields play a pivotal role in accretion-disk physics. The spin history of millisecond pulsars, which are usually classified as magnetized neutron…

太阳与恒星天体物理 · 物理学 2013-12-16 Luca Naso , John Miller , Wlodek Kluzniak

Possible manifestations of accreting magnetars are discussed. It is shown that the four ultra-luminous X-ray pulsars can be understood in the accreting low magnetic field magnetar scenario. The NGC300 ULX1 pulsar may have a higher dipole…

高能天体物理现象 · 物理学 2018-11-14 H. Tong , W. Wang

Context. Changes of the rotational period observed in various magnetized accreting sources are generally attributed to the interaction between the in-falling plasma and the large-scale magnetic field of the accretor. A number of models have…

We present results of a population synthesis study aimed at examining the role of spin-kick alignment in producing a correlation between the spin period of the first-born neutron star and the orbital eccentricity of observed double neutron…

天体物理学 · 物理学 2009-06-23 B. Willems , J. Andrews , V. Kalogera , K. Belczynski

Rotation-powered millisecond radio pulsars have been spun up to their present spin period by a $10^8$ - $10^9$ yr long X-ray-bright phase of accretion of matter and angular momentum in a low-to-intermediate mass binary system. Recently, the…

高能天体物理现象 · 物理学 2015-06-19 A. Papitto , D. F. Torres , N. Rea , T. Tauris

Rapidly rotating magnetic neutron stars in eccentric binary systems containing an early type star provide a unique opportunity to investigate the interplay between radio pulsar, stellar wind and accretion phenomena. We summarise the radio…

天体物理学 · 物理学 2007-05-23 S. Campana , L. Stella , S. Mereghetti , M. Colpi

Millisecond spinning, low magnetic field neutron stars are believed to attain their fast rotation in a 0.1-1 Gyr-long phase during which they accrete matter endowed with angular momentum from a low-mass companion star. Despite extensive…

Weakly magnetic, millisecond spinning neutron stars attain their very fast rotation through a 1E8-1E9 yr long phase during which they undergo disk-accretion of matter from a low mass companion star. They can be detected as accretion-powered…

高能天体物理现象 · 物理学 2018-10-22 F. Ambrosino , A. Papitto , L. Stella , F. Meddi , P. Cretaro , L. Burderi , T. Di Salvo , G. L. Israel , A. Ghedina , L. Di Fabrizio , L. Riverol

The accretion induced neutron star magnetic field evolution is studied through considering the accretion flow to drag the field lines aside and dilute the polar field strength, and as a result the equatorial field strength increases and is…

天体物理学 · 物理学 2009-11-10 C. M. Zhang , Y. Kojima

We study the accretion efficiency of neutron stars in long-period binaries, i.e. with periods longer than about 200d, which accrete from a giant companion. Using alpha-disc models and taking into account the effect of irradiation of the…

天体物理学 · 物理学 2007-05-23 H. Ritter , A. King

Quasi-spherical accretion in wind-fed X-ray pulsars is discussed. At X-ray luminosities <4 10^{36} erg/s, a hot convective shell is formed around the neutron star magnetosphere, and subsonic settling accretion regime sets in. In this…

高能天体物理现象 · 物理学 2011-11-08 K. Postnov , N. Shakura , A. Kochetkova , L. Hjalmarsdotter