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Calibration issues in Δα/α
Published online by Cambridge University Press: 21 October 2010
Extract
Laser Comb Wavelength calibration shows ThAr one locally unreliable with deviations up to 100 m s−1 (or Δα/α ≈ 7 · 10−6 for a Fe ii-Mg ii pair) while delivering an overall 1 m s−1 accuracy. Comparison of line shifts of the 5 Fe ii lines with identical sensitivity to Δα/α offers a clean way to test local wavelength calibration errors of whatever origin.
- Type
- Contributed Papers
- Information
- Proceedings of the International Astronomical Union , Volume 5 , Highlights H15: Highlights of Astronomy , November 2009 , pp. 330
- Copyright
- Copyright © International Astronomical Union 2010