Astronomy and Astrophysics – Astrophysics – Instrumentation and Methods for Astrophysics
Scientific paper
2010-08-20
Astronomy and Astrophysics
Astrophysics
Instrumentation and Methods for Astrophysics
11 pages, 11 figures, accepted for publication in A&A (updated version)
Scientific paper
We present a technique to synthesise telluric absorption and emission features both for in-situ wavelength calibration and for their removal from astronomical spectra. While the presented technique is applicable for a wide variety of optical and infrared spectra, we concentrate in this paper on selected high-resolution near-infrared spectra obtained with the CRIRES spectrograph to demonstrate its performance and limitation. We find that synthetic spectra reproduce telluric absorption features to about 2%, even close to saturated line cores. Thus, synthetic telluric spectra could be used to replace the observation of telluric standard stars, saving valuable observing time. This technique also provides a precise in-situ wavelength calibration, especially useful for high-resolution near-infrared spectra in the absence of other calibration sources.
Bean Jacob L.
Kaufl Hans Ulrich
Richter Matthew Joseph
Seifahrt Andreas
Siebenmorgen Ralf
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