盖亚的承诺以及它将如何影响恒星年龄
The promise of Gaia and how it will influence stellar ages
摘要：
盖亚空间项目计划于2011年发射，是欧空局的一项重要任务，将为大约10亿颗亮度大于V=20的恒星提供高质量的天体测量、光度测量和光谱数据。这将使几个最基本的天体物理学问题的信息和知识达到前所未有的水平，例如银河系的测绘，恒星物理学（分类和参数化），银河系运动学和动力学，研究本星系群中分辨的恒星星族，宇宙的距离尺度和年龄，暗物质分布（潜在的示踪剂），参考系（类星体，天体测量学），行星探测，基础物理学，太阳物理学，太阳系科学。我将介绍该仪器及其主要特征，并讨论一些具体的科学案例，其中盖亚数据有望在本次研讨会的范围内做出根本性的改进。
英文摘要：
The Gaia space project, planned for launch in 2011, is one of the ESA cornerstone missions, and will provide astrometric, photometric and spectroscopic data of very high quality for about one billion stars brighter than V=20. This will allow to reach an unprecedented level of information and knowledge on several of the most fundamental astrophysical issues, such as mapping of the Milky Way, stellar physics (classification and parameterization), Galactic kinematics and dynamics, study of the resolved stellar populations in the Local Group, distance scale and age of the Universe, dark matter distribution (potential tracers), reference frame (quasars, astrometry), planet detection, fundamental physics, Solar physics, Solar system science. I will present a description of the instrument and its main characteristics, and discuss a few specific science cases where Gaia data promise to contribute fundamental improvement within the scope of this Symposium.
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