Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-04-09
Astronomy and Astrophysics
Astrophysics
To appear in the proceedings of "High Resolution Infrared Spectroscopy in Astronomy" (ESO Headquarters, 18-21 November 2003);
Scientific paper
10.1007/10995082_17
We present a method to correct the chromatic and airmass dependent extinction for N-band spectra taken with the TIMMI2 instrument at the ESO / La Silla observatory. Usually, the target and calibrator star have to be observed at similar airmass in order to obtain reliable spectrophotometric fluxes. Our method allows to correct the atmospheric extinction and substantially improves the spectrophotometric flux calibration, when the standard stars were observed at a very different airmass than the targets. Hundreds of standard star measurements in several passbands (N1, N8.9, N10.4, N11.9) were used to derive mid-IR extinction coefficients. We demonstrate that applying our correction of the differential extinction to test data results in a spectrophotometric accuracy up to 2% within the literature flux.
Schuetz Oliver
Sterzik Michael
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