Ion-ion charge exchange and X-rays from the winds of hot stars

被引：3
|
作者：
Pollock, A. M. T. [1 ]
机构：
[1] European Space Astron Ctr, XMM Newton SOC, European Space Agcy, Villanueva De La Canada 28691, Spain
来源：
ASTRONOMISCHE NACHRICHTEN | 2012年 / 333卷 / 04期
关键词：
plasmas; shock waves; stars: early type; stars:; winds; outflows; stars: Wolf-Rayet; X-rays: stars; EMISSION;
D O I：
10.1002/asna.201211668
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Charge exchange occurs between charged ions with enough energy to overcome Coulomb repulsion, a condition satisfied for collisions at velocities like those of the winds driven from hot stars by radiation pressure. X-ray line ratios in some hot stars are inconsistent with those expected from thermal plasmas excited by electron impact. Ion-ion interactions including charge exchange might be responsible instead if high-velocity collisions between ions are enabled by the presence of a magnetic field in the wind, suggesting a possible alternative mechanism to the widely accepted instability-driven shock model. The nature of a plasma in charge-exchange equilibrium is yet to be determined. (c) 2012 WILEY-VCH Verlag GmbH&Co. KGaA, Weinheim
引用
收藏
页码：351 / 354
页数：4
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