| 题名 | 活动冷星星珥的观测研究 |
| 作者 | 曹东涛 |
| 学位类别 | 硕士 |
| 答辩日期 | 2011-06 |
| 授予单位 | 中国科学院研究生院（云南天文台） |
| 授予地点 | 北京 |
| 导师 | 顾盛宏 |
| 关键词 | 晚型恒星 磁活动 恒星星珥活动 分光观测 色球活动 |
| 其他题名 | The observational study of prominences on active cool stars |
| 学位专业 | 天体物理 |
| 中文摘要 | 恒星磁活动的观测研究一直是恒星物理领域内的热点课题，其中恒星星珥活动是恒星磁活动现象的一个重要方面。对恒星星珥活动的观测研究，不仅可以丰富我们对恒星磁活动现象的认识，而且对于研究恒星外部磁场形态、以及恒星冕区结构具有重要意义，所以我们通过高色散分光手段来探测恒星星珥活动的信号，并对恒星星珥活动的基本特征做进一步的研究。 我们利用国家天文台兴隆观测基地2.16米望远镜的高色散分光设备，分别对食双星AR Lac、SZ Psc和快速自转单星LQ Hya进行了观测研究，分析结果如下： 对于食双星AR Lac，我们于2009年10月份取得了两个晚上的分光观测资料，但是其中有一部分观测资料处于食双星两颗子星相互交食的位相上，所以我们只对食外和全食处的光谱运用综合光谱减技术进行了分析研究。在其中一个晚上的食外的剩余光谱中看到了吸收特征，但是通过计算发现造成吸收的活动特征的高度值很低，所以该吸收特征不可能是由于恒星星珥活动造成的。最后，我们还对其中的一些剩余光谱通过高斯拟合去除色球活动的影响来探测星珥活动事件，但是没有发现恒星星珥活动的信号。对于快速自转单星LQ Hya，我们于2011年2月份获得了一批观测资料，首先利用综合光谱减技术对观测光谱的H-alpha线进行了分析，最后对得到的剩余光谱通过两种方法来探测恒星星珥活动事件，依然没有发现恒星星珥活动的信号。 在2010年12月，我们对食双星SZ Psc进行了高色散分光观测，获得了一批观测资料。对于活动食双星SZ Psc，我们首先运用综合光谱减技术对H-alpha谱线进行了分析，发现冷子星具有很强的色球活动特征，而且在其剩余光谱中我们看到了宽的发射线翼的存在，这说明在其色球活动中存在微耀斑。在H-alpha线的剩余光谱中，我们发现了有吸收特征的存在，对于其中的一个吸收特征，认为是由于恒星星珥活动所造成的。根据恒星星珥的基本模型，我们计算了星珥距离冷子星自转轴之间的距离，并且和其它双星系统中恒星星珥活动进行了比较。 最后，我们对所作的工作进行了总结，并对这个领域未来的研究方向进行了展望，结合我们目前的研究情况，给出了切合实际的长远的研究计划。 |
| 英文摘要 | The observational study of the stellar magnetic activity is always the hot topic in Stellar physics field. Stellar prominence activity is an important part of the stellar magnetic activity. The observational study of stellar prominence activity, not only enriches our knowledge about the stellar magnetic activity, but also has great significance to the study of stellar coronal structure and coronal magnetic field topology. Consequently we purpose to detect the stellar prominences by means of high-resolution spectroscopy, and study the basic characteristics of the stellar prominence activity. We have made observational study for the eclipsing binary AR Lac、SZ Psc and the rapidly rotating single star LQ Hya with the 2.16 m telescope at the Xinglong station of the National Astronomical Observatories. The results are obtained as follows: For eclipsing binary AR Lac, we obtained two observing night spectra in Oct. 2009. Using the spectral subtraction technique, we analyzed H-alpha lines in out of eclipsing and total eclipsing. We found the absorption features in some residual H-alpha profiles, and calculated the distance from the rotation axis of the cooler component. The absorption is not likely caused by prominences because of the short distance. In addition, for the purpose of detecting the prominences, we also removed the effect of chromospheric activity in some residual spectra by Gaussian fitting, but we did not find the prominences. For rapidly rotating single star LQ Hya, we also obtained a batch of spectra. We firstly analyzed the H-alpha lines of the observed spectra using the spectral subtraction technique, and then detected the stellar prominences in residual spectra with two methods. However，there is no evidence of prominence activity. In Dec. 2010, we made high-resolution spectroscopic observation for the active eclipsing binary SZ Psc, and obtained many high-resolution echelle spectra. We performed the analysis for the spectra using the spectral subtraction technique, and found that the cooler component of the system has stronger chromospheric activity. Also, the subtracted spectra of the cooler component showed broad wings that can arise from microflaring. Some absorption features were detected in the subtracted H-alpha lines, and one of them probably results from the prominence-like material seen on the cooler component. According to the simple model, we calculated the distance of the prominence from the rotation axis of cooler component. Moreover, we made a comparison between the prominences seen in SZ Psc and in other binary systems. Finally, We have made a summary to our work, and made a prospect to the research works of this field in future. Considering our present research status, a long-term project is proposed according to our instruments. |
| 语种 | 中文 |
| 学科主题 | 天文学 |
| 页码 | 67 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5331]  |
| 专题 | 云南天文台_恒星物理研究组 |
| 推荐引用方式 GB/T 7714 | 曹东涛. 活动冷星星珥的观测研究[D]. 北京. 中国科学院研究生院（云南天文台）. 2011. |
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