A grid of synthetic ionizing spectra for very hot compact stars from NLTE model atmospheres
A grid of synthetic ionizing spectra for very hot compact stars from NLTE model atmospheres
复制标题
NLTE 模型大气中极热致密星的合成电离光谱网格
DOI：
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发表时间：
2003
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通讯作者：
T. Rauch
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作者：
T. Rauch
行星状星云性质的精确分析在很大程度上依赖于良好的恒星电离光谱模型。在UV-X射线波长范围内的观测以及NLTE模型对它们的激发星光谱的计算表明，黑体通量和仅由氢和氦组成的“标准”NLTE大气模型都不是很好的近似。从这些合成的光谱之间的强diepheresis相比，观察到的光谱在能量高于54 eV（他II基态）可以归因于忽略金属线覆盖。真实模拟紫外-X射线波长范围内热恒星的出射通量需要金属线覆盖的NLTE模型大气，其中包括从氢到铁族的所有元素。为此，我们提出了一个网格（太阳和晕丰度比）的金属线覆盖的NLTE模型大气通量，其中包括行星状星云的中心恒星的参数范围。
The precise analysis of properties of planetary nebulae is strongly dependent on good models for the stellar ionizing spectrum. Observations in the UV - X-ray wavelength range as well as NLTE model atmosphere calculations of spectra of their exciting stars have shown that neither blackbody fluxes nor "standard" NLTE atmosphere models which are composed out of hydrogen and helium only are good approximations. Strong dierences between synthetic spectra from these compared to observed spectra at energies higher than 54 eV (He II ground state) can be ascribed to the neglect of metal-line blanketing. Realistic modeling of the emergent fluxes of hot stars in the UV - X-ray wavelength range requires metal-line blanketed NLTE model atmospheres which include all elements from hydrogen up to the iron-group. For this purpose, we present a grid (solar and halo abundance ratios) of metal-line blanketed NLTE model atmosphere fluxes which covers the parameter range of central stars of planetary nebulae.