Using a model for telluric absorption in full-spectrum fits

T.-O. Husser* and K. Ulbrich
Institut für Astrophysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

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The typical approach for removing telluric absorption lines from a science spectrum is to divide it by the spectrum of a standard star of spectral type A or B observed close in time and airmass. We present a new method, where we use a model for the transmission of the Earth’s atmosphere in a full-spectrum fit, which determines the parameters for the stellar and Earth’s atmosphere simultaneously. This eliminates the need of a standard star completely.

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Keywords : spectral library – tellurics – full-spectrum fit