STELLAR CORONOGRAPH WITH PHASE MASK
STELLAR CORONOGRAPH WITH PHASE MASK
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带相位罩的恒星日冕仪
DOI：
10.1086/133949
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发表时间：
1997
影响因子：
3.5
通讯作者：
C. Roddier
中科院分区：
文献类型：
--
作者：
F. Roddier;C. Roddier
对非常接近明亮星星的微弱光源的探测主要受到地球大气散射光的限制。这种散射光的来源现在可以通过自适应光学来减少，或者通过使用太空望远镜来完全消除。然后望远镜孔径的衍射成为散射光的主要来源。虽然传统的Lyot日冕仪可以减少从星星衍射出去的光的数量，但它在非常接近星星的地方就变得效率低下。代替在不透明掩模上形成恒星图像，这里建议使用在恒星图像的核心上产生180度相移的小相位板。在纤芯外衍射的光然后通过相消干涉被消除。应用于哈勃太空望远镜，这项技术将很容易地允许检测到一个恒星伴星0.3”远离星星和至少8等昏暗。
The detection of faint light sources very close to a bright star is primarily limited by light scattered by the Earth's atmosphere. This source of scattered light can now be reduced by means of adaptive optics, or totally eliminated by using a telescope in space. Then diffraction by the telescope aperture becomes the primary source of scattered light. Whereas a classical Lyot coronograph can reduce the amount of light diffracted away from the star, it becomes inefficient very close to the star. Instead of forming the stellar image on an opaque mask, it is proposed here to use a small phase plate which produces a 180 degrees phase shift on the core of the stellar image. Light diffracted outside the core is then eliminated by destructive interference. Applied to the Hubble Space Telescope, the technique would easily allow detection of a stellar companion 0.3" away from a star and at least 8 magnitude fainter.