arXiv 0709.00412007-09-01astro-ph

行星状星云中心恒星的光谱分析

Spectral Analysis of Central Stars of Planetary Nebulae

Thomas Rauch, Klaus Werner, Marc Ziegler, Jeffrey W. Kruk, Cristina M. Oliveira

备注：: 8 pages, 5 figures

摘要：

通过NLTE模式大气进行的光谱分析目前已经达到了高度的复杂性。行星状星云中心恒星的高分辨率光谱可以从红外线到X射线波长范围内详细再现。在Sh 2-216的激发星LSV +4621的情况下，我们展示了在确定光球特性方面的最新技术，例如，有效温度、表面重力和从氢到镍的元素丰度。从如此详细的大气模型中，我们可以可靠地预测中心恒星的电离光谱，这是精确分析其周围星云的必要输入。然而，NLTE模式大气光谱不仅对专家有用。在德国天体物理虚拟天文台（GAVO）的框架内，我们提供了预先计算的网格表与合成光谱的热，紧凑的恒星，以及一个工具来计算个人模型大气光谱，以使合成恒星光谱的使用一样容易，使用黑体通量分布在上个世纪。

英文摘要：

Spectral analysis by means of NLTE model atmospheres has presently arrived at a high level of sophistication. High-resolution spectra of central stars of planetary nebulae can be reproduced in detail from the infrared to the X-ray wavelength range. In the case of LSV +4621, the exciting star of Sh 2-216, we demonstrate the state-of-the-art in the determination of photospheric properties like, e.g., effective temperature, surface gravity, and abundances of elements from hydrogen to nickel. From such detailed model atmospheres, we can reliably predict the ionizing spectrum of a central star which is a necessary input for the precise analysis of its ambient nebula. NLTE model-atmosphere spectra, however, are not only accessible for specialists. In the framework of the German Astrophysical Virtual Observatory (GAVO), we provide pre-calculated grids of tables with synthetic spectra of hot, compact stars as well as a tool to calculate individual model-atmosphere spectra in order to make the use of synthetic stellar spectra as easy as the use of blackbody flux distributions had been in the last century.

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