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The Korean Astronomical Society (한국천문학회)
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IMPROVEMENT OF RADIAL VELOCITY MEASUREMENT ACCURACY BY TELLURIC LINES

대기 흡수선을 이용한 시선속도 측정 정밀도 향상

  • Published : 2009.12.31
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Abstract

We present a method to improve the RV (radial velocity) measurements accuracy by using telluric lines. Telluric lines are used to estimate the wavelength scale drift over the detector of the spectrograph. In the case of BOES, the Echelle spectrograph at BOAO (Bohyunsan Optical Astronomical Observatory), the wavelength scale drift can be several hundreds m/s over 24 hours. Due to the wavelength scale drift, the RV measurements accuracy of BOES is limited to several hundreds m/s. By estimating the wavelength scale drift by telluric lines, we can remove its effect to improve the RV measurements accuracy to about 40 m/s.

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References

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