Equation of state and opacities for hydrogen atmospheres of magnetars

Details Equation of state and opacities for hydrogen atmospheres of magnetars Equation of state and opacities for hydrogen atmospheres of magnetars

2003-09-11

arxiv.org/abs/astro-ph/0309310v1

Astrophys.J.600:317-323,2004

Astronomy and Astrophysics

Astrophysics

7 pages, 6 figures, LaTeX using emulateapj.cls (included). Accepted by ApJ

Scientific paper

10.1086/379807

The equation of state and radiative opacities of partially ionized, strongly magnetized hydrogen plasmas, presented in a previous paper [ApJ 585, 955 (2003), astro-ph/0212062] for the magnetic field strengths 8.e11 G < B < 3.e13 G, are extended to the field strengths 3.e13 G < B < 1.e15 G, relevant for magnetars. The first- and second-order thermodynamic functions and radiative opacities are calculated and tabulated for 5.e5 < T < 4.e7 K in a wide range of densities. We show that bound-free transitions give an important contribution to the opacities in the considered range of B in the outer neutron-star atmosphere layers. Unlike the case of weaker fields, bound-bound transitions are unimportant.

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