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Strong magnetic fields are observed in a substantial fraction of upper main sequence stars and white dwarfs. Many such stars are observed to exhibit photometric modulations as the magnetic poles rotate in and out of view, which could be a…

太阳与恒星天体物理 · 物理学 2023-02-22 Jim Fuller , Stephane Mathis

We develop the formalism for computing the magnetic field within an axisymmetric neutron star with a strong Type II superconductor core surrounded by a normal conductor. The formalism takes full account of the constraints imposed by…

高能天体物理现象 · 物理学 2014-09-30 K. T. Henriksson , I. Wasserman

Observations of magnetic A, B and O stars show that the poloidal magnetic flux per unit mass has an upper bound of 10^-6.5 G cm^2/g. A similar upper bound is found for magnetic white dwarfs even though the highest magnetic field strengths…

太阳与恒星天体物理 · 物理学 2015-06-17 Dayal T. Wickramasinghe , Christopher A. Tout , Lilia Ferrario

The magnetic fields observed in Ap-stars, white dwarfs, and neutron stars are known to be stable for long times. However, the physical conditions inside the stellar interiors that allow these states are still a matter of research. It has…

太阳与恒星天体物理 · 物理学 2022-10-05 L. Becerra , A. Reisenegger , J. A. Valdivia , M. Gusakov

Neutron stars can harbor extremely strong magnetic fields, yet the structure and stability of their magnetic field configuration remain poorly understood. Observations of pulsars indicate that the large-scale external field is predominantly…

高能天体物理现象 · 物理学 2026-05-25 Aurora Capobianco , William Cook , Sebastiano Bernuzzi , Brynmor Haskell , Jacob Fields

We construct barotropic stellar equilibria, containing magnetic fields with both poloidal and toroidal field components. We extend earlier results by exploring the effect of different magnetic field and current distributions. Our results…

太阳与恒星天体物理 · 物理学 2015-06-04 S. K. Lander , D. I. Jones

We investigate the effect of strong magnetic fields on the adiabatic radial oscillations of hadronic stars. We describe magnetized hadronic matter within the framework of the relativistic nonlinear Walecka model and integrate the equations…

高能天体物理现象 · 物理学 2016-08-01 C. Vásquez Flores , L. B. Castro , G. Lugones

Compact stars with strong magnetic fields (magnetars) have been observationally determined to have surface magnetic fields of order of 10^{14}-10^{15} G, the implied internal field strength being several orders larger. We study the equation…

高能天体物理现象 · 物理学 2017-03-22 Monika Sinha , Banibrata Mukhopadhyay , Armen Sedrakian

The extraordinary energetic activity of magnetars is usually explained in terms of dissipation of a huge internal magnetic field of the order of $10^{15-16}$G. How such a strong magnetic field can originate during the formation of a neutron…

高能天体物理现象 · 物理学 2017-07-26 A. G. Pili , N. Bucciantini , L. Del Zanna

We seek to obtain a picture of the interstellar magnetic field in the Galactic center region that is as clear and complete as possible. To that end, we review the observational knowledge that has built up over the past 25 years on…

星系天体物理 · 物理学 2015-05-13 Katia Ferriere

Magnetic fields in upper main-sequence stars, white dwarfs, and neutron stars are known to persist for timescales comparable to their lifetimes. From a theoretical perspective this is problematic, as it can be shown that simple magnetic…

太阳与恒星天体物理 · 物理学 2015-06-12 Taner Akgün , Andreas Reisenegger , Alpha Mastrano , Pablo Marchant

The magnetars are believed to be highly magnetized neutron stars having surface magnetic field 10^{14} - 10^{15} G. It is believed that at the center, the magnetic field may be higher than that at the surface. We study the effect of the…

高能天体物理现象 · 物理学 2013-02-15 Banibrata Mukhopadhyay , Monika Sinha

We construct the stably stratified magnetized stars within the framework of general relativity. The effects of magnetic fields on the structure of the star and spacetime are treated as perturbations of non-magnetized stars. By assuming…

广义相对论与量子宇宙学 · 物理学 2019-04-19 Shijun Yoshida

Upper main sequence stars, white dwarfs and neutron stars are known to possess stable, large-scale magnetic fields. Numerical works have confirmed that stable MHD equilibria can exist in non-barotropic, stably stratified stars. On the other…

太阳与恒星天体物理 · 物理学 2015-06-23 C. Armaza , A. Reisenegger , J. A. Valdivia

Spectropolarimetric observations have been used to map stellar magnetic fields, many of which display strong bands of azimuthal fields that are toroidal. A number of explanations have been proposed to explain how such fields might be…

Current models of magnetars require extremely strong magnetic fields to explain their observed quiescent and bursting emission, implying that the field strength within the star's outer crust is orders of magnitude larger than the dipole…

太阳与恒星天体物理 · 物理学 2016-04-07 Konstantinos N. Gourgouliatos , Toby Wood , Rainer Hollerbach

The influence of strong, large-scale magnetic fields on the structure and temperature distribution in white dwarf atmospheres is investigated. Magnetic fields may provide an additional component of pressure support, thus possibly inflating…

天体物理学 · 物理学 2016-08-30 Ch. Fendt , D. Dravins

(Abridged) We develop a theoretical framework to construct axisymmetric magnetic equilibria in stars, consisting of both poloidal and toroidal magnetic field components. In a stationary axisymmetric configuration, the poloidal current is a…

太阳与恒星天体物理 · 物理学 2015-05-13 Maxim Lyutikov

Magnetars are compact stars which are observationally determined to have very strong surface magnetic fields of the order of $10^{14}-10^{15}$G. The centre of the star can potentially have a magnetic field several orders of magnitude…

高能天体物理现象 · 物理学 2014-05-16 Ritam Mallick , Stefan Schramm

The interior of a neutron star is likely to be predominantly a mixture of superfluid neutrons and superconducting protons. This results in the quantisation of the star's magnetic field into an array of thin fluxtubes, producing a…

太阳与恒星天体物理 · 物理学 2015-06-12 S. K. Lander
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