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Echelle Spectroscopy by a CCD at Low Signal-to-Noise Ratio

Published online by Cambridge University Press:  07 August 2017

Didier Queloz
Didier Queloz*
Affiliation:
Observatoire de Genève

Abstract

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The measurement of some physical parameters of astronomical objects can only be carried out with high resolution spectra. Unfortunately the high dispersion of the light on the detector restricts such observations to relatively bright sources. However, some spectral information can be concentrated into a single spectral “line” by a cross-correlation algorithm, allowing the observation of fainter objects. Such a technique, taken from the CORAVEL optical correlation, is presented. A complete description of the errors of the correlation function parameters is given and the minimum signal-to-noise ratio is also discussed. Finally, a short investigation of the best resolution needed to observe efficiently radial velocities and velocity broadenings is made.

Type
Section I — Review Papers
Information
Symposium - International Astronomical Union , Volume 167: New Developments in Array Technology and Applications , 1995 , pp. 221 - 229
Copyright
Copyright © Kluwer 1995 

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