Abstract—In the paper the possibility of the presence of a non-thermal component described by a power law spectrum in the X-ray spectra of OB stars is investigated. The low-resolution spectra of 101 OB stars obtained using the EPIC camera on the XMM satellite are analyzed. It is concluded that the contribution of the non-thermal component of X-ray emission can be significant and even determining for the stars similar to γ Cas. The inclusion of the non-thermal component in the model X-ray spectra reduces the temperature of the thermal components of the X-ray plasma of such stars down to typical for OB stars values. The contribution of the non-thermal component can also be significant for binary stars with colliding stellar winds and for Of?p stars.

中文翻译：

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非热成分对OB星X射线发射的贡献

摘要—在本文中，研究了由OB恒星的X射线光谱中的幂定律光谱描述的非热成分的可能性。分析了在XMM卫星上使用EPIC相机获得的101 OB恒星的低分辨率光谱。结论是，X射线发射的非热成分的贡献可能很大，甚至可以确定类似于γCas的恒星。在模型X射线光谱中包含非热成分将此类恒星X射线等离子体的热成分温度降低到OB恒星典型值。非热分量的贡献对于恒星风碰撞的双星和Ofp星也很重要。