Studies on x-ray emission mechanisms of stars by a collisional-radiative model including effects of radiation transfer

通过碰撞辐射模型研究恒星的 X 射线发射机制，包括辐射传输的影响

• 批准号: 16540221
• 负责人: YAMAMOTO Norimasa
• 金额: $ 1.98万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16540221/
• 关键词: collisional-radiative model; early type stars; X-ray emission mechanism; X-ray spectra; iron; X線天文; 輻射モデル; X線; 宇宙物理; X線天文学; 原子・分子物理

Our research goal is to elucidate X-ray emission mechanisms of stars. To accomplish our study, at first we developed a new collisional-radiative model of stellar wind from stars including the radiation transfer. Next we applied our stellar wind model to the observed X-ray spectral lines with X-ray satellites to reveal the X-ray emitted region around stars, the density of the stellar wind, the temperature of the stellar wind, and so on.The result of our study is as follows.(1) Developments of a high precise collisional-radiative model of various helium-like (C, N, O, Ne, Mg, Si, S) ions. Inclusions of radiation transfer by Monte Carlo method are at a stage of a toy model.(2) Developments of a collisional-radiative model on KLM-shell Fe ions and applications to laboratory plasma. The model for Fe ions was applied to helical plasmas (large helical device (LHD) at the National Institute for Fusion Science) for highly precise modeling.(3) Constructions of a Doppler model including three components, the doppler shift derived from a velocity distribution of stellar winds, absorptions by mediums in stellar winds, and filling factors.(4) Analysis of early type stars obtained with X-ray satellites (Chandra and XMM-Newton) by the doppler model, and discussions of X-ray emission regions around stars. Furthermore X-ray emission spectra of stars by Suzaku satellite (launched in 2005) were analyzed. We obtained that x-ray emission regions of zeta-pup are near a star, on the other hand these of tau-sco are far from a star (Yamamoto et al.2007).We plan as follows, more precise analysis of x-ray emission spectra, a development from current toy model to a practical radiation transfer model, researches of practical non-equilibrium plasma model. Then, astronomical plasmas and solar plasmas are analyzed by the model.

我们的研究目标是阐明恒星的 X 射线发射机制。为了完成我们的研究，首先我们开发了一种新的恒星星风碰撞辐射模型，包括辐射传输。接下来我们将我们的恒星风模型应用到X射线卫星观测到的X射线谱线上，揭示了恒星周围的X射线发射区域、恒星风的密度、恒星风的温度等。我们的研究结果如下：(1)建立了各种类氦(C、N、O、Ne、Mg、Si、S)离子的高精度碰撞辐射模型。蒙特卡罗方法的辐射传输内含物还处于玩具模型阶段。(2)KLM壳层Fe离子碰撞辐射模型的发展及其在实验室等离子体中的应用。 Fe离子模型被应用于螺旋等离子体（国立核聚变科学研究所的大型螺旋装置（LHD）），以进行高精度建模。（3）多普勒模型的构建，包括三个分量：恒星风速度分布的多普勒频移、恒星风中介质的吸收和填充因子。（4）利用X射线卫星获得的早期类型恒星的分析 （Chandra 和 XMM-Newton）通过多普勒模型，以及恒星周围 X 射线发射区域的讨论。此外，还分析了朱雀卫星（2005年发射）的恒星X射线发射光谱。我们得出zeta-pup的X射线发射区域靠近恒星，而tau-sco的X射线发射区域远离恒星（Yamamoto et al.2007）。我们计划如下：更精确地分析X射线发射光谱，从当前的玩具模型发展到实用的辐射传输模型，实用的非平衡等离子体模型的研究。然后，通过该模型对天文等离子体和太阳等离子体进行了分析。

项目成果

Satellite line spectra of He-like Mg ions for plasma diagnostics and atomic data

用于等离子体诊断和原子数据的类 He 镁离子卫星线谱

• 发表时间: 2006
• 期刊: Journal of Plasma and Fusion Research SERIES Vol.7
• 作者: Genzel;R;Tacconi;L.J.;Cimatti;A;Daddi;E;Arimoto;N et al.;N.Yamamoto et al.
• 通讯作者: N.Yamamoto et al.

GX 339—4: the distance, state transitions, hysteresis and spectral correlations

• DOI: 10.1111/j.1365-2966.2004.07830.x
• 发表时间: 2004-02
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: A. Zdziarski;M. Gierliński;J. Mikołajewska;G. Wardziński;David M. Smith;B. A. Harmon;S. Kitamoto

Development for an Ultra-High Precision X-Ray Telescope

超高精度X射线望远镜的研制

• 发表时间: 2004
• 期刊: Progress of Theoretical Physics Supple. 155
• 作者: S.Kitamoto;H.Takano;H.Saitoh;N.Yamamoto;T.Kohmura;K.Suga;H.Sekiguchi;Y.Ohkawa;J.Kanai S.Chiba
• 通讯作者: J.Kanai S.Chiba

Periodic long-term X-ray and radio variability of Cygnus X-1

Cygnus X-1 的定期长期 X 射线和无线电变异性

• 发表时间: 2006
• 期刊: MNRAS 368
• 作者: Lachowicz;Pawel;Zdziarski;Andrzej A.;Schwarzenberg-Czerny;Alex;Pooley;Guy G.;Kitamoto;Shunji
• 通讯作者: Shunji

Optics for EUV, X-Ray and Gamma-Ray Astronomy II

EUV、X 射线和伽马射线天文学 II 光学器件

• 发表时间: 2005
• 期刊: Proceedings of SPIE, 5900
• 作者: S.Kitamoto;N.Yamamoto;T.Kohmura;K.Suga;H.Sekiguchi;J.Satoh;K.Sudoh;T.Watanabe;Y.Ohkubo;A.Sekiguchi;M.Tsuijimoto
• 通讯作者: M.Tsuijimoto