Other
Scientific paper
Jun 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011javso..39...80m&link_type=abstract
The Journal of the American Association of Variable Star Observers, vol. 39, nr. 1, p. 80
Other
Scientific paper
AAVSO observers and others have measured the times of minima of hundreds of eclipsing binaries over many decades. These times can be used to construct (O-C) diagrams that can be used to refine the periods of the stars, and to look for changes or fluctuations in the periods. We have applied the Eddington-Plakidis (1929) model to the (O-C) data on 100 stars in the AAVSO-Eclipsing Binary Program, to determine whether the (O-C) diagrams can be explained by the cumulative effect of random, cycle-to-cycle fluctuations in period. The stars can be divided into three groups: 25-35% showing (O-C) fluctuations due only to measurement errors; 40-50% showing small, random cycle-to-cycle period fluctuations (typically a few times 10^4 of a cycle), and 20-30% showing (O-C) variations which do not fit the Eddington-Plakidis model and therefore cannot be explained by the accumulation of random fluctuations. We discuss possible explanations for these three groups.
Mohajerani S.
Percy John R.
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