Universal relations between the quasinormal modes of neutron star and tidal deformability

A “giant” outburst of A 0535+262, a transient X-ray binary pulsar, was observed in 1994 February and March with the Burst and Transient Source Experiment (BATSE) onboard the Compton Gamma-Ray Observatory. During the outburst power spectra of the hard X-ray flux contained a QPO-like component with a FWHM of approximately 50% of its center frequency. Over the course of the outburst the center frequency rose smoothly from 35 mHz to 70 mHz and then fell to below 40 mHz. We compare this QPO frequency with the neutron star spin-up rate, and discuss the observed correlation in terms of the beat frequency and Keplerian frequency QPO models in conjunction with the Ghosh-Lamb accretion torque model.

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A nearby neutron-star merger explains the actinide abundances in the early Solar System

Nature ◽

10.1038/s41586-019-1113-7 ◽

2019 ◽

Vol 569 (7754) ◽

pp. 85-88 ◽

Cited By ~ 11

Author(s):

Imre Bartos ◽

Szabolcs Marka

Keyword(s):

Neutron Star ◽

Solar System ◽

Early Solar System

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Multiple Pulsar Ejection in Supernova Events

Symposium - International Astronomical Union ◽

10.1017/s0074180900007695 ◽

1971 ◽

Vol 46 ◽

pp. 378-381

Author(s):

F. Curtis Michel

Keyword(s):

Star Formation ◽

Neutron Star ◽

Energy Loss

Fragmentation in the collapse of a supernova core, followed by energy loss in neutron star formation, is shown to lead to disruption of the resulting system. The elements of the system, some of which should be pulsars, can attain velocities of the order of 103 km/sec if currently quoted parameters are correct.

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Gravitational Collapse versus Thermonuclear Explosion of Degenerate Stellar Cores

International Astronomical Union Colloquium ◽

10.1017/s0252921100026373 ◽

1994 ◽

Vol 147 ◽

pp. 186-213

Author(s):

J. Isern ◽

R. Canal

Keyword(s):

Neutron Star ◽

White Dwarfs ◽

Light Curves ◽

Type Ia Supernovae ◽

Radioactive Elements ◽

Border Line ◽

Thermonuclear Explosion ◽

Type Ia ◽

Γ Rays ◽

Ia Supernovae

AbstractIn this paper we review the behavior of growing stellar degenerate cores. It is shown that ONeMg white dwarfs and cold CO white dwarfs can collapse to form a neutron star. This collapse is completely silent since the total amount of radioactive elements that are expelled is very small and a burst of γ-rays is never produced. In the case of an explosion (always carbonoxygen cores), the outcome fits quite well the observed properties of Type Ia supernovae. Nevertheless, the light curves and the velocities measured at maximum are very homogeneous and the diversity introduced by igniting at different densities is not enough to account for the most extreme cases observed. It is also shown that a promising way out of this problem could be the He-induced detonation of white dwarfs with different masses. Finally, we outline that the location of the border line which separetes explosion from collapse strongly depends on the input physics adopted.

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