用GAIA和VLT-GIRAFFE计算恒星和星云的径向速度、动力学
Radial velocities, dynamics of stars and nebulosities with GAIA and VLT-GIRAFFE
摘要：
本文件分为两部分。第一部分是利用VLT-GIRAFFE观测到的疏散星团NGC 2004和NGC 330的大麦哲伦云和小麦哲伦云中B型星和星云的视向速度分布。由于GIRAFFE光谱的分辨率，我们发现，在LMC的星云RV分布是双峰。这种双模态可以解释，在动力学方面，通过LMC 4超级气泡的膨胀。第二部分介绍了GAIA空间飞行任务和利用径向速度谱仪（RVS）谱确定径向速度。确定径向速度的方法，以及模拟RVS谱的初步结果。
英文摘要：
This document is divided in two parts. The first part deals with the radial velocities (RV) distributions for B-type stars and nebulosities observed with the VLT-GIRAFFE in the Large and Small Magellanic Clouds towards the open clusters NGC2004 and NGC330. Thanks to the resolution of GIRAFFE spectra, we found that the RV distribution for the nebulosities in the LMC is bi-modal. This bi-modality can be interpreted, in term of dynamics, by the expansion of the LMC4 superbubble. The second part deals with the GAIA space mission and the determination of the radial velocities by using Radial Velocity Spectrometer (RVS) spectra. The methods to determine the radial velocities are presented as well as preliminary results on simulated RVS spectra.
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