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Title:
A Method of Correcting Near-Infrared Spectra for Telluric Absorption
Authors:
Vacca, William D.; Cushing, Michael C.; Rayner, John T.
Affiliation:
AA(Institute for Astronomy, University of Hawaii, Honolulu, HI 96822; , , ; Currently at the Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, 85741 Garching, Germany.), AB(Institute for Astronomy, University of Hawaii, Honolulu, HI 96822; , , ), AC(Institute for Astronomy, University of Hawaii, Honolulu, HI 96822; , , )
Publication:
The Publications of the Astronomical Society of the Pacific, Volume 115, Issue 805, pp. 389-409. (PASP Homepage)
Publication Date:
03/2003
Origin:
UCP
PASP Keywords:
Atmospheric Effects, Methods: Data Analysis, Techniques: Spectroscopic
DOI:
10.1086/346193
Bibliographic Code:
2003PASP..115..389V

Abstract

We present a method for correcting near-infrared medium-resolution spectra for telluric absorption. The method makes use of a spectrum of an A0 V star, observed near in time and close in air mass to the target object, and a high-resolution model of Vega, to construct a telluric correction spectrum that is free of stellar absorption features. The technique was designed specifically to perform telluric corrections on spectra obtained with SpeX, a 0.8-5.5 μm medium-resolution cross-dispersed spectrograph at the NASA Infrared Telescope Facility, and uses the fact that for medium resolutions there exist spectral regions uncontaminated by atmospheric absorption lines. However, it is also applicable (in a somewhat modified form) to spectra obtained with other near-infrared spectrographs. An IDL-based code that carries out the procedures is available for downloading via the World Wide Web.

Based on observations obtained with the Infrared Telescope Facility, which is operated by the University of Hawaii under contract to the National Aeronautics and Space Administration.

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