The precision of radial-velocity determinations of solar-type stars by cross-correlation |
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Authors: | Kaylene Murdoch J B Hearnshaw |
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Institution: | (1) Mt John University Observatory, Dept. of Physics, University of Canterbury, Christchurch, New Zealand |
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Abstract: | The theoretical limit to the precision (defined as the inverse of the square of the random error) of a radial-velocity determination of a solar-type star obtained from the technique of digital cross-correlation is constructed as a function of simple parameters of the recording of a stellar spectrum.The relationship is used to establish conditions for maximizing the precision for a given object, exposure time, and observing instrument. Both fibre-fed and Cassegrain-mounted spectrographs are considered. |
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