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The Utrecht Photometric System (≡ UPS) and Some Results With it

Published online by Cambridge University Press:  12 April 2016

J.R.W. Heintze
J.R.W. Heintze*
Affiliation:
Astronomical Institute Utrecht,P.O. Box 80 000, 3508 TA Utrech,The Netherlands

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The Utrecht Photometric System (≡ UPS) is a narrow-band photometric system (Δλ ⩽ 10 nm) characterized by wavelength regions in which no telluric lines and nearly no stellar/interstellar spectral lines are present. Because in the near-infra red the density of spectral lines is much less than in the visible and blue, filters with transmission as far as possible into the near-infra red are necessary. Photomultipliers with GaAs cathodes, which have a high sensitivity up to 900 nm have enabled the design of the UPS. In Figure 1 the absolute

Figure 1. Comparison of responsivities of several cathodes.

Figure 2. The positions of the UPS filters with respect to solar and telluric lines.

responsivity of the GaAs cathode is compared with S1, S4, S13, S20 and S20 extended cathodes. In Figure 2a the transmission curves of the UPS (474, 579, 672, 781 and 871 nm) are given as a function of wavelength (Provoost (1980) gives larger graphs for the transmissions). Figure 2b shows in the lower part over 20 Å summed up equivalent widths of solar lines as a function of wavelength. In the upper part of Figure 2b the same is done for the telluric lines.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 107: Algols , 1989 , pp. 257 - 260
Copyright
Copyright © Kluwer 1989

References

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