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The visual and infrared flux calibrations

Published online by Cambridge University Press:  25 May 2016

C. Megessier
C. Megessier*
Affiliation:
Observatoire de Paris-Meudon F-92195 Meudon Cedex France

Abstract

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We present a critical review of the available visible and near infrared flux calibrations. In the visible, the accuracy and the good consistency of three independent determinations of Vega monochromatic flux allow one to recommend with confidence f5556-Vega = 3.46 10−11Wm−2nm−1 within 0.7%. In the near infrared, the possible flux excess of Vega, as compared to that derived from the atmosphere models fitting the visible, does not allow such a good accuracy. The agreement between the calibrations, either from a comparison of Vega to blackbodies or from solar analog stars, would question the calibrations relying on models. More work is necessary to conclude with confidence and then to reduce the uncertainty on the near infrared calibrations.

Type
Stellar Flux Distributions
Information
Symposium - International Astronomical Union , Volume 189: Fundamental Stellar Properties: The Interaction Between Observation and Theory , 1997 , pp. 61 - 66
Copyright
Copyright © Kluwer 1997 

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