The Critical Rotation of Strange Stars and Rapidly Rotating Pulsars | Zendy

Xiaoping Zheng | Zendy; ShuHua Yang | Zendy; Jiarong Li | Zendy

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The Critical Rotation of Strange Stars and Rapidly Rotating Pulsars

Author(s) -

Xiaoping Zheng,

ShuHua Yang,

Jiarong Li

Publication year - 2003

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/374370

Subject(s) - pulsar , physics , instability , rotation (mathematics) , astrophysics , rotation period , stars , gravitational wave , neutron star , strange matter , viscosity , window (computing) , tiltmeter , mechanics , optics , quantum mechanics , amplitude , geometry , mathematics , computer science , operating system

We utilize the bulk viscosity of interacting strange quark matter toreevaluate the damping time scale. The presence of medium effect of bulkviscosity leads to a stronger damping of r-modes, which can be over an order ofmagnitude for realistic parameters. We find that the r-mode instability windowis narrowed due to the medium effect, and hence when a pulsar reaches theinstability window it will only slow down by gravitational wave emission to aperiod of 1.78msec instead of 2.5msec given by early estimate. As a theoreticalupper rotation limit of pulsars, the period of 1.78msec is very close to thetwo most rapidly spinning pulsars known, with periods of about 1.6msec.Comment: 10pages,5figure

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