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Accuracy in variable star work: The three-star single-channel technique

Published online by Cambridge University Press:  12 April 2016

Michel Breger
Michel Breger*
Affiliation:
Institute of Astronomy, University of Vienna, Austria

Abstract

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The three-star technique for photoelectric photometers is discussed. The technique is used to study millimag variations of variable stars with periods in the range of 30 minutes to a few days. It is emphasized that for highest precision two comparison stars should be used and observed as often as the variable star. The different types of numbers used to express the precision of measurement are discussed together with possible misinterpretations.

Finally, the successful use of an extinction coefficient derived from differential extinction between the three stars is illustrated with measurements showing an extreme amount of instrumental sensitivity drift.

Type
Session 2 High Precision Photometry
Information
International Astronomical Union Colloquium , Volume 136: Stellar Photometry – Current Techniques and Future Developments , 1993 , pp. 106 - 112
Copyright
Copyright © C.J. Butler and I. Elliottt 1993

References

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