Hostname: page-component-cd9895bd7-gxg78 Total loading time: 0 Render date: 2024-12-25T16:06:10.133Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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
Palmer, B.A., & Engleman, R. Jr. 1983, Atlas of the Thorium Spectrum, Los Alamos National Laboratory, LA-9615Google Scholar
Simkin, S.M. 1974, A&A, 31, 129 Google Scholar
Skuljan, J., Cottrell, P.L. & Hearnshaw, J.B. 1997, Proceedings of the ESA Symposium ‘Hipparcos - Venice ’97’, ESA SP-402, p. 525 Google Scholar