OB星X射线线电离与光谱类型的相关性
The Correlation between X-Ray Line Ionization and Optical Spectral Types of the OB Stars
摘要：
本文报道了钱德拉X射线天文台观测到的正常OB星的X射线谱线电离与其光谱类型之间的显著相关性。这些相关性包括随着光谱类型的发展，相对于较低电离X射线线，较高电离的逐渐减弱，以及α离子的类H线与类He线的强度比类似地减小。这些关系不是由模型预测的，在对少数天体的天体物理学研究中也不是很明显;相反，它们是从足够的（尽管仍然很小）样本的形态分析中出现的，从这些样本中分离出了已知的特殊天体，如磁星和非常快速的旋转体，以揭示正常的趋势。这个过程类似于第一次证明了紫外线风廓线和正常OB星的光谱类型之间的密切关系，这可能与目前的X射线结果有物理和历史联系。由于光谱类型是根据基本恒星参数校准的，因此风和X射线光谱是由后者决定的。这些观测结果为这些现象的进一步天体物理建模提供了强有力的指导。
英文摘要：
Marked correlations are reported between the ionization of the X-ray line spectra of normal OB stars, as observed by the Chandra X-Ray Observatory, and their optical spectral types. These correlations include the progressive weakening of the higher ionization relative to the lower ionization X-ray lines with advancing spectral type, and the similarly decreasing intensity ratios of the H-like to He-like lines of the alpha ions. These relationships were not predicted by models, nor have they been clearly evident in astrophysical studies of a few objects; rather, they have emerged from morphological analysis of an adequate (albeit still small) sample, from which known peculiar objects such as magnetic stars and very rapid rotators have been isolated to reveal the normal trends. This process is analogous to that which first demonstrated the strong relationships between the UV wind profiles and the optical spectral types of normal OB stars, which likely bear a physical as well as a historical connection to the present X-ray results. Since the optical spectral types are calibrated in terms of fundamental stellar parameters, it follows that the winds and X-ray spectra are determined by the latter. These observations provide strong guidance for further astrophysical modeling of these phenomena.
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