THE CORRELATION BETWEEN X-RAY LINE IONIZATION AND OPTICAL SPECTRAL TYPES OF THE OB STARS
THE CORRELATION BETWEEN X-RAY LINE IONIZATION AND OPTICAL SPECTRAL TYPES OF THE OB STARS
复制标题
X射线线电离与OB星光谱类型之间的相关性
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
W. Waldron
中科院分区：
文献类型：
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作者：
N. Walborn;J. Nichols;W. Waldron
据报道，钱德拉 X 射线天文台观测到的正常 OB 星 X 射线线光谱的电离与其光学光谱类型之间存在显着的相关性。这些相关性包括随着光谱类型的进步，较高电离度相对于较低电离度 X 射线线的逐渐减弱，以及类似的 α 离子的类 H 线与类 He 线的强度比降低。这些关系并没有被模型预测到，也没有在对一些天体的天体物理学研究中得到清晰的体现。相反，它们是从对足够的（尽管仍然很小）样本的形态分析中得出的，从这些样本中分离出已知的特殊物体，如磁星和非常快速的旋转体，以揭示正常的趋势。这一过程类似于首次证明紫外线风廓线与正常 OB 星的光谱类型之间的密切关系，这可能与当前的 X 射线结果具有物理和历史联系。由于光谱类型是根据基本恒星参数进行校准的，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。
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 α 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.