By A. Labeyrie

ISBN-10: 0511224877

ISBN-13: 9780511224874

ISBN-10: 0521535654

ISBN-13: 9780521535656

ISBN-10: 0521828724

ISBN-13: 9780521828727

Over the past 20 years, optical stellar interferometry has develop into an incredible software in astronomical investigations requiring spatial answer well past that of conventional telescopes. This booklet, first released in 2006, was once the 1st to be written at the topic. The authors supply a longer advent discussing easy actual and atmospheric optics, which establishes the framework essential to current the guidelines and perform of interferometry as utilized to the astronomical scene. They persist with with an outline of ancient, operational and deliberate interferometric observatories, and a range of significant astrophysical discoveries made with them. ultimately, they current a few as-yet untested principles for tools either at the floor and in area that can let us photo info of planetary platforms past our personal.

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Extra info for An Introduction to Optical Stellar Interferometry

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The line following a particular maximum of the wave (a growing circle in this case) is called a wavefront. 4(a) and (b) and measuring the distance that the wavefront has traveled in the time between the photographs. It also has a group velocity which is the distance traveled in unit time by the envelope of the group of waves excited by the stone. The group and wave velocities may not be equal; in the case of water surface waves they are not, but for electromagnetic waves in free space the two velocities are equal.

Let’s do a simple calculation to see how it works. First remember that what we see on the retina of the eye is angular dimension; that is why distant objects seem smaller than close ones. 6 µm. The interference fringes for a slit separation d have angular positions θm given by the well-known formula (see any book on elementary physical optics) mλ = d sin θm from which the fringe spacing is, assuming small angles, λ/d. Therefore we expect the fringes to be smeared out when the angular size of the source becomes comparable with this.

A, 360, 969. Hanbury Brown, R. and R. Q. Twiss (1956). Nature, 178, 1046. Hanbury Brown, R. (1974). The Intensity Interferometer, London: Taylor and Francis. Labeyrie, A. (1970). Astron. , 6, 85. Labeyrie, A. (1975). Astrophys. , 196, L71. Lawson, P. R. (2000) ed. Principles of Long Baseline Stellar Interferometry, NASA-JPL. Michelson, A. A. (1890). Phil. , 30, 1. Michelson, A. A. (1891). Nature, 45, 160. Michelson, A. A. and F. G. Pease (1921). , 53, 249. Monnier, J. D. (2003). Rep. Prog. , 66, 789.

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An Introduction to Optical Stellar Interferometry by A. Labeyrie


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