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Calibration issues in Δα/α

Published online by Cambridge University Press:  21 October 2010

Miriam Centurión ,
Paolo Molaro  and
Sergei Levshakov
Miriam Centurión
Affiliation:
INAF –Osservatorio Astronomico di Trieste, Via Tiepolo 11, I-34131 Trieste, Italy
Paolo Molaro
Affiliation:
INAF –Osservatorio Astronomico di Trieste, Via Tiepolo 11, I-34131 Trieste, Italy
Sergei Levshakov
Affiliation:
Ioffe Institute Politekhnicheskaya, Str. 26, 194021St. Petersburg, Russia
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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