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Proceedings Paper

Flux-calibration of medium-resolution spectra from 300 nm to 2500 nm
Author(s): Sabine Moehler; Andrea Modigliani; Wolfram Freudling; Noemi Giammichele; Alexandros Gianninas; Anais Gonneau; Wolfgang Kausch; Ariane Lançon; Stefan Noll; Thomas Rauch; Jakob Vinther
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Paper Abstract

While the near-infrared wavelength regime is becoming more and more important for astrophysics there are few spectrophotometric standard star data available to flux calibrate such data. On the other hand flux calibrating high-resolution spectra is a challenge even in the optical wavelength range, because the available flux standard data are often too coarsely sampled. We describe a method to obtain reference spectra derived from stellar model atmospheres, which allow users to derive response curves from 300 nm to 2500 nm also for high-resolution spectra. We verified that they provide an appropriate description of the observed standard star spectra by checking for residuals in line cores and line overlap regions in the ratios of observed spectra to model spectra. The finally selected model spectra are then empirically corrected for remaining mismatches and photometrically calibrated using independent observations. In addition we have defined an automatic method to correct for moderate telluric absorption using telluric model spectra with very high spectral resolution, that can easily be adapted to the observed data. This procedure eliminates the need to observe telluric standard stars, as long as some knowledge on the target spectrum exists.

Paper Details

Date Published: 6 August 2014
PDF: 12 pages
Proc. SPIE 9149, Observatory Operations: Strategies, Processes, and Systems V, 91490L (6 August 2014); doi: 10.1117/12.2055153
Show Author Affiliations
Sabine Moehler, European Southern Observatory (Germany)
Andrea Modigliani, European Southern Observatory (Germany)
Wolfram Freudling, European Southern Observatory (Germany)
Noemi Giammichele, Univ. de Montréal (Canada)
Alexandros Gianninas, The Univ. of Oklahoma (United States)
Anais Gonneau, Observatoire astronomique de Strasbourg, CNRS, Univ. de Strasbourg (France)
Wolfgang Kausch, Univ. of Innsbruck (Austria)
Univ. of Vienna (Austria)
Ariane Lançon, Observatoire Astronomique de Strasbourg, CNRS, Univ. de Strasbourg (France)
Stefan Noll, Univ. of Innsbruck (Austria)
Thomas Rauch, Eberhard Karls Univ. Tübingen (Germany)
Jakob Vinther, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 9149:
Observatory Operations: Strategies, Processes, and Systems V
Alison B. Peck; Chris R. Benn; Robert L. Seaman, Editor(s)

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