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Absolute Radial Velocities by Cross-Correlation with Synthetic Spectra

Published online by Cambridge University Press:  12 April 2016

J. Skuljan ,
J. B. Hearnshaw  and
P. L. Cottrell
J. Skuljan
Affiliation:
Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
J. B. Hearnshaw
Affiliation:
Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
P. L. Cottrell
Affiliation:
Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch, New Zealand

Abstract

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Precise absolute radial velocities have been measured for several hundred late-type stars at Mt John University Observatory with the 1-m telescope, fiber-fed échelle spectrograph, and Thomson CCD. Six échelle orders in the green (5000−5600 Å) are used. Many delicate steps have been undertaken in order to maintain exactly the same conditions, both in recording and reducing the spectra, over a period of 18 months. A cross-correlation technique with theoretical spectra computed by R. L. Kurucz has been chosen to determine the absolute radial velocities. Blue sky spectra have been used to monitor systematic zero-point fluctuations from one observing run to another. An additional correlation between the measured velocities and average number of A/D units in the continuum has been discovered and used for fine adjustments, significantly improving the results. A random uncertainty of 10–20 ms−1 has been achieved for stellar spectra having intrinsically constant radial velocities.

Type
Part 2. Fundamental Concepts and Techniques
Information
International Astronomical Union Colloquium , Volume 170: Precise Stellar Radial Velocities , 1999 , pp. 91 - 97
Copyright
Copyright © Astronomical Society of the Pacific 1999

References

Kurucz, R.L. 1996, private communicationGoogle Scholar
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Skuljan, J., Cottrell, P.L. & Hearnshaw, J.B. 1997, Proceedings of the ESA Symposium ‘Hipparcos - Venice ’97’, ESA SP-402, p. 525 Google Scholar