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Absolute Spectrally Continuous Stellar Irradiance Calibration in the Infrared

Published online by Cambridge University Press:  12 April 2016

Martin Cohen ,
R.G. Walker ,
M.J. Barlow ,
J.R. Deacon ,
F.C. Witteborn ,
D.F. Carbon  and
G.C. Augason
Martin Cohen
Affiliation:
Radio Astronomy Laboratory, University of California, Berkeley Jamieson Science and Engineering, Inc
R.G. Walker
Affiliation:
Jamieson Science and Engineering, Inc
M.J. Barlow
Affiliation:
Department of Physics and Astronomy, University College London
J.R. Deacon
Affiliation:
Department of Physics and Astronomy, University College London
F.C. Witteborn
Affiliation:
Astrophysics Branch, NASA-Ames Research Center
D.F. Carbon
Affiliation:
NAS Systems Development Branch, NASA-Ames Research Center
G.C. Augason
Affiliation:
Space Instrumentation and Studies Branch, NASA-Ames Research Center

Abstract

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We present first efforts to establish a network of absolutely calibrated continuous infrared spectra of standard stars across the 1-35μm range in order to calibrate arbitrary broad and narrow passbands and low-resolution spectrometers from ground-based, airborne, balloon, and satellite-borne sensors. The value to photometry of such calibrated continuous spectra is that one can integrate arbitrary filters over the spectra and derive the stellar in-band flux, monochromatic flux density, and hence the magnitude, for any site. This work is based on new models of Sirius and Vega by Kurucz which were calculated by him, for the first time, with realistic stellar metallicities and a customized finely-gridded infrared wavelength scale. We have absolutely calibrated these two spectra and have calculated monochromatic flux densities for both stars, and isophotal wavelengths, for a number of infrared filters. Preliminarily, the current IRAS point source flux calibration is too high by 2, 6, 3, and 12% at 12, 25, 60, and 100μm, respectively.

Type
Session 1 Photometric Systems
Information
International Astronomical Union Colloquium , Volume 136: Stellar Photometry – Current Techniques and Future Developments , 1993 , pp. 59 - 65
Copyright
Copyright © C.J. Butler and I. Elliottt 1993

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