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Temperature Effect in Zero-Point Drift

Published online by Cambridge University Press:  25 April 2016

Z. Kviz
Z. Kviz*
Affiliation:
The University of New South Wales
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Extract

The relationship between the observed magnitude of a star and the air-mass takes the shape of a loop. These loops are caused by the zero-point drift of the photometer in use and by the variations of the atmospheric extinction taking place during the observation (Kviz 1979). From observations where the temperature drift of the photometer and of the photomultiplier were recorded, it is evident that the sense of the loops is correlated with the physical temperature of the photo-multiplier. Measurements have been made with the Swiss telescope and the 7-colour Geneva photometer P 7 using pulse counting with PM tube EMI9798 — described in Burnet (1976) and Burnet, Rufener (1979) — at La Silla, Chile.

Type
Contributions
Information
Publications of the Astronomical Society of Australia , Volume 4 , Issue 2 , 1981 , pp. 260 - 262
Copyright
Copyright © Astronomical Society of Australia 1981

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References

Burnet, M. Thesis, Ecole polytechnique federale de Lausanne. (1976).Google Scholar
Burnet, M., Rufener, F. Astron. Astrophys., 74 54 (1979).Google Scholar
Kviz, Z. IAU Coll. No. 46 Changing Trends in Variable Star Research, University of Waikato, Hamilton, N.Z. (1979).Google Scholar