MHD instabilities in accretion mounds on neutron star binaries

被引：0

作者：

Mukherjee, Dipanjan ^{[1
]}

Bhattacharya, Dipankar ^{[1
]}

Mignone, Andrea ^{[2
]}

机构：

[1] Inter Univ Ctr Astron & Astrophys, Pune 411007, Maharashtra, India

[2] Univ Turin, Dipartimento Fis Gen, Turin, Italy

来源：

PROCEEDINGS OF THE 31ST MEETING OF THE ASTRONOMICAL SOCIETY OF INDIA, 2013 | 2013年

关键词：

accretion; instabilities; (magnetohydrodynamics) MHD; stars: neutron; (stars:) binaries: general; POLAR CAPS; MODEL;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have numerically solved the Grad-Shafranov equation for axisymmetric static MHD equilibria of matter confined to the polar cap of neutron stars. From the equilibrium solutions we explore the stability of the accretion mounds using the PLUTO MHD code. We find that pressure driven modes disrupt the equilibria beyond a threshold mound mass, forming dynamic structures, as matter spreads over the neutron star surface. Our results show that local variation of magnetic field will significantly affect the shape and nature of the cyclotron features observed in the spectra of High Mass X-ray Binaries.

引用

页码：17 / 20

页数：4

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