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On the Variation of the Orbital Period and the 67-Min Oscillations in EX Hydrae

Published online by Cambridge University Press:  12 April 2016

C. Sterken ,
N. Vogt ,
R.F. Freeth ,
H.D. Kennedy ,
B.F. Marino ,
A.A. Page  and
W.S.G. Walker
C. Sterken
Affiliation:
Astrophysical Institute, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium
N. Vogt
Affiliation:
Universitätssternwarte, Scheinerstrasse 1, D-8000 München 80, Germany
R.F. Freeth
Affiliation:
Department of Physics, The University of Auckland, Private Bag, Auckland, New Zealand
H.D. Kennedy
Affiliation:
Midway Observatory, Kelvin Grove College of Advanced Education, Victoria Park road, Brisbane, Qld 4059
B.F. Marino
Affiliation:
Queen Street 156, Northcote, Auckland 9, New Zealand
A.A. Page
Affiliation:
Mount Tamborine Observatory, 17 Hillhouse street, Aspley, Qld 4034
W.S.G. Walker
Affiliation:
Appleyard Crescent 14, Auckland, New Zealand

Extract

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We report the first results of an observational campaign consisting of coordinated photoelectric photometry of Ex Hya from four observatories at different geographical longitudes for a total of 146 hours in April 1979.

Ex Hya was monitored differentially for a total of 109 hours, partly simultaneously at different telescopes. The largest time-interval of uninterrupted observation is of nearly 18 hours. 68 times of eclipse, and 89 times of maxima in the 67-minute cycle have been obtained. Figure 1 is an 0-C diagram representing all residuals listed by Vogt et al. (1980), and those as obtained during this run.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 72: Cataclysmic Variables and Related Objects , 1983 , pp. 51 - 54
Copyright
Copyright © Reidel 1983

References

REFERENCES

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Mumford, G.S. 1967, Astrophys. J. Suppl. 15, 1 Google Scholar
Vogt, N., Krzeminski, W., Sterken, C. 1980, Astron. Astrophys. 85, 106 Google Scholar