| Observing Solar-Like Oscillations (2007) | |||||||||||||
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| . We review techniques for measuring stellar oscillations in solartype stars. Despite great efforts, no unambiguous detections have been made. A new method, based on monitoring the equivalent widths of strong lines, shows promise but is yet to be confirmed. We also discuss several subtleties, such as the need to correct for CCD non-linearities and the importance of data weighting. 1. Why search for solar-like oscillations? Given the tiny amplitudes of oscillations in the Sun and the obvious problems in detecting similar oscillations in other stars, we should first ask whether the effort is justified. Oscillation frequencies give information about the sound speed in different parts of the stellar interior. They can be measured much more precisely than can any of the other fundamental parameters which have been discussed at this meeting. Accuracies of 10 \Gamma3 --10 \Gamma4 have been achieved for "classical" multi-periodic pulsators stars such as ffi Scuti stars, rapidly oscillati... | |||||||||||||
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