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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Suzaku and NuSTAR X-ray spectroscopy of gamma Cassiopeiae and HD 110432
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Suzaku and NuSTAR X-ray spectroscopy of gamma Cassiopeiae and HD 110432

机译：古筝和Nustar X射线光谱的伽马酸Cassiopeiae和HD 110432

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摘要

gamma Cas and its dozen analogs comprise a small but distinct class of X-ray sources. They are early Be-type stars with an exceptionally hard thermal X-ray emission. The X-ray production mechanism has been under intense debate. Two competing ideas are (i) the magnetic activities in the Be star and its disk, and (ii) the mass accretion onto the unidentified white dwarf (WD). We adopt the latter as a working hypothesis and apply physical models developed to describe the X-ray spectra of classical WD binaries containing a late-type companion. Models of non-magnetic and magnetic accreting WDs were applied to gamma Cas and its brightest analog HD 110432 using the Suzaku and NuSTAR data. The spectra were fitted by the two models, including the Fe fluorescence and the Compton reflection in a consistent geometry. The derived physical parameters are in a reasonable range in comparison to their classical WD binary counterparts. Additional pieces of evidence in the X-ray spectra - partial covering, Fe L lines, Fe I fluorescence - were not conclusive enough to classify these two sources into a subclass of accreting WD binaries. We discuss further observations, especially long-term temporal behaviors, which are important to elucidate the nature of these sources, if indeed they host accreting WDs.
机译：伽玛CAS及其十几种类似物包括一个小但不同类的X射线源。它们早期是型恒星，具有异常硬的热X射线发射。 X射线生产机制一直处于激烈的辩论。两种竞争的想法是（i）磁性活性在恒星及其盘中，（ii）在未识别的白色矮种（WD）上的质量增加。我们采用后者作为工作假设，并应用发展的物理模型，以描述包含后期伴侣的经典WD二进制二进制文件的X射线光谱。使用Suzaku和Nustar数据施加非磁性和磁性增强WDS的模型及其最亮的模拟HD 110432。光谱由两种模型装配，包括Fe荧光和康普顿反射在一致的几何形状中。与其经典WD二进制对应物相比，派生的物理参数处于合理的范围内。 X射线光谱中的额外证据 - 部分覆盖，FE L线，Fe I荧光 - 没有足够的决定，以将这两个来源分类为增强WD二进制二进制文件的子类。我们讨论进一步的观察，特别是长期的时间行为，这对于阐明这些来源的性质非常重要，如果确实他们主持了增强的WDS。

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