The European Southern Observatory
The European Southern Observatory
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欧洲南方天文台
DOI：
10.1051/epn/19700111005
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发表时间：
1970
期刊：
影响因子：
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通讯作者：
A. Blaauw
中科院分区：
文献类型：
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作者：
A. Blaauw
欧洲南方天文台总干事拉尼克云是银河系外的恒星系统（可能是银河系的卫星），只能从南半球看到。它们比安德罗梅达星云离我们近十倍，安德罗梅达星云是北半球天文学家进行河外研究的主要对象的恒星系统。因此，麦哲伦星云处于更有利的位置。它们既包含非常古老的恒星，也包含非常年轻的恒星，并且仍然是活跃的恒星形成场所。因此，对于研究恒星诞生和恒星演化过程来说，它们是一个宏伟的天然实验室。银河系中心区域也是一个典型的南方天体，对于研究银河系结构具有重要意义。我们知道，根据迄今为止对我们银河系的稀少观测，但根据来自其他恒星系统的更广泛的信息，在大螺旋星云的中心部分发生了剧烈的物理过程，这些过程
Director General of ESO lanic clouds are stellar systems out side the Galaxy—probably satellites of it—and can be seen only from the southern hemisphere. They are ten times nearer to us than the Andro meda nebula, the stellar system which for northern hemisphere astronomers is the principal object for extragalactic studies. Thus, the Magellanic Clouds are in a much more favourable po sition. They contain both very old and quite young stars and are still the scene of active star formation. They are therefore, for studies of the pro cess of star birth and of stellar evo lution, a magnificent natural labora tory.The central region of the Galaxy—also a typical southern object—is of great importance for the study of galactic structure. We know, from scarce observations so far in our Galaxy, but from more extensive infor mation derived from other stellar systems, that in the central parts of the large spiral nebulae violent physi cal processes occur which are of