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EVIDENCE FOR THE IMPORTANCE OF RESONANCE SCATTERING IN X-RAY EMISSION LINE PROFILES OF THE O STAR ζ PUPPIS

机译:O星ζ泵的X射线发射线轮廓中共振散射的重要性的证据

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摘要

We fit the Doppler profiles of the He-like triplet complexes of O VII and N VI in the X-ray spectrum of the O star ζ Pup, using XMM-Newton RGS data collected over ~400 ks of exposure. We find that they cannot be well fit if the resonance and intercombination lines are constrained to have the same profile shape. However, a significantly better fit is achieved with a model incorporating the effects of resonance scattering, which causes the resonance line to become more symmetric than the intercombination line for a given characteristic continuum optical depth τ_*. We discuss the plausibility of this hypothesis, as well as its significance for our understanding of Doppler profiles of X-ray emission lines in O stars.
机译:我们使用在〜400 ks曝光时收集的XMM-Newton RGS数据,将O VII和N VI的He样三重态复合物的多普勒谱图拟合在O星ζPup的X射线光谱中。我们发现,如果将共振线和组合线限制为具有相同的轮廓形状,它们将无法很好地拟合。但是,通过结合了共振散射效应的模型,可以获得更好的拟合效果,对于给定的特征连续光学深度τ_*,该模型使共振线变得比组合线更对称。我们讨论了该假设的合理性,以及其对于我们理解O星X射线发射谱线的多普勒剖面的意义。

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