Absolute calibration of the infrared flux from VEGA at 1.24, 2.20, 3.76 and 4.6 microns by comparison with a standard furnace

Astronomy and Astrophysics – Astronomy

Scientific paper

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Calibrating, Flux Quantization, Infrared Astronomy, Radiant Flux Density, Stellar Radiation, Atmospheric Models, Furnaces, Monochromatic Radiation, Stellar Atmospheres

Scientific paper

A determination has been made at Tenerife of the absolute monochromatic flux from Vega at 1.24, 2.20, 3.76 and 4.6 μm with an accuracy of 3 per cent for λ < 4 μm and ≡12 per cent for λ > 4 μm, using a calibrated furnace as standard. The technique differs in detail from that used for similar observations in 1980. The results confirm in general those obtained in 1980, especially at λ ≡ 3.8 μm. Both the 1980 and the 1981 observations show an excess flux of about 7 per cent for λ > 2 μm compared to that calculated by Dreiling & Bell using their model atmosphere for Vega.

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