Titlebook: Observing and Measuring Visual Double Stars; R. W. Argyle Book 2012Latest edition Springer Science+Business Media New York 2012

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Why Observe Double Stars?,Like many branches of astronomy, the observation of double stars can be appreciated 5 at several levels. For those who enjoy the night sky, double stars offer some of 6 the most attractive sights around and they are particularly good in small telescopes 7 where the colours are much more obvious.

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The Diffraction Grating Micrometer,Diffraction influences telescopic images by the effect it has on incoming starlight as we have seen in Chap. 10. It can also be used as the basis for a simple micrometer.

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The Observation of Binocular Double Stars,ed with the unaided eye, while a modest pair of binoculars will reveal many more; the study of double stars can be enjoyed by those who do not possess a large telescope or expensive equipment. There is a broad selection of binoculars on the market, so let us take a 10 look at those that might be suitable for this branch of astronomy.

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Lucky Imaging,ysed in the computer, and the image is permanent, and can be re-called for future reference. Another benefit of direct imaging is that brightness differences of the components can be measured, which is especially interesting for pairs with contrasting colours.

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