Be星HD119682的热X射线辐射
Hot thermal X-ray emission from the Be star HD119682
摘要：
我们提出了一个系列的四个连续的钱德拉高分辨率透射光栅的观察，总计150 ks，的Be X射线源HD 119682（= 1 WGA J1346.5-6255），一类新的伽马Cas类似物的成员的分析。钱德拉光曲线显示出以小时为单位的时间尺度上显着的亮度变化。然而，在每次观测和整个活动期间，光谱分布似乎相当稳定。详细分析无法检测到频率高达0.05 Hz的任何相干脉动。钱德拉HETG光谱似乎没有任何强发射线，包括Fe α荧光。的连续体是很好地描述了两个碰撞电离等离子体的温度分别为KT = 15 keV和0.2 keV，由apec模型。使用光致电离等离子体成分（mekal）或非热成分（powerlaw）的模型拟合较差，支持纯热情景。这两种成分被一根柱子吸收，N_H=（0.20^+0.15-0.03）x 10^22 cm^-2，与星际值一致。我们的结论是，HD 119682可以被视为一个极-on gamma Cas类似物。
英文摘要：
We present an analysis of a series of four consecutive Chandra high resolution transmission gratings observations, amounting to a total of 150 ks, of the Be X-ray source HD119682 (= 1WGA J1346.5-6255), a member of the new class of gamma Cas analogs. The Chandra lightcurve shows significant brightness variations on timescales of hours. However, the spectral distribution appears rather stable within each observation and during the whole campaign. A detailed analysis is not able to detect any coherent pulsation up to a frequency of 0.05 Hz. The Chandra HETG spectrum seems to be devoid of any strong emission line, including Fe alpha fluorescence. The continuum is well described with the addition of two collisionally ionized plasmas of temperatures kT = 15 keV and 0.2 keV respectively, by the apec model. Models using photoionized plasma components (mekal) or non thermal components (powerlaw) give poorer fits, giving support to the pure thermal scenario. These two components are absorbed by a single column with N_H=(0.20^+0.15-0.03) x 10^22 cm^-2 compatible with the interstellar value. We conclude that HD119682 can be regarded as a pole-on gamma Cas analog.
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