By Robert W. Argyle
From the stories: "I suggest it to somebody with an curiosity in binary stars who desires to research extra approximately those attention-grabbing objects." (Jocelyn Tomkin, The Observatory, April 2005)
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Extra info for Observing and Measuring Visual Double Stars
This may be by making measures of ρ and θ for the binary systems using a micrometer, doing photometry of wider pairs with a CCD camera or calculating orbits from the observed positions. Most of this book will be dedicated to the description of such techniques and opportunities for useful work are discussed further in Chapter 19. 17 18 Observing and Measuring Visual Double Stars Colours Much has been written on this subject and it will continue to exercise fascination amongst observers. It is perhaps the most compelling reason why people observe double stars.
Pairs in this region are almost all beyond the range of small apertures. Periods Less than 1 Year To detect stars as binary in this period regime, which is beyond the scope of this book, it is necessary to turn to 38 Observing and Measuring Visual Double Stars the spectrograph or the ground-based optical array. , 2001, An Introduction to Close Binary Stars, Cambridge University Press. Chapter 5 Multiple Stars and Planets Bob Argyle Binary Star Formation Observational evidence strongly suggests that double stars are the rule rather than the exception in our Galaxy.
The most common type is the visual binary but this is simply due to the fact that these systems are near enough to us that we can resolve them optically. It is quite likely that during the next 10 or 20 years as more sophisticated satellites such as GAIA are launched, the number of binary stars known is likely to increase tremendously. This is to be expected since near the Sun we know that more than half our stellar neighbours are members of binary or multiple systems and there is no reason to suppose that this is just a phenomenon peculiar to this region of the Galaxy.
Observing and Measuring Visual Double Stars by Robert W. Argyle