Journal
ASTRONOMY & ASTROPHYSICS
Volume 524, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/200913782
Keywords
atmospheric effects; instrumentation: adaptive optics; instrumentation: spectrographs; methods: observational; methods: data analysis
Categories
Funding
- Deutsche Forschungsgemeinschaft [DFG RE 1664/4-1]
- National Science Foundation [NSF AST-0708074]
- European Commission [PIFFGA-2009-234866]
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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.
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