An orbital period study of the contact system AB Andromedae

Details An orbital period study of the contact system AB Andromedae An orbital period study of the contact system AB Andromedae

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291..765k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 3, p. 765-774

Astronomy and Astrophysics

Astrophysics

26

Eclipsing Binary Stars, Light Curve, Periodic Variations, Stellar Orbits, Variable Stars, Data Reduction, Ephemerides, Fourier Transformation, Least Squares Method

Scientific paper

The O-C curve of the contact binary AB Andromedae is analyzed using a new method which enables the calculation of the orbital period P(E) and its rate of change dP/P as continous functions of time. A critical consideration of the most probable physical mechanisms that modulate the orbital period in the observed way, is made on the basis of a periodic (i.e. Applegate mechanism, third body assumption)or non-periodic (i.e. main circulation system, stability properties) modulation. Short-time period variations can be explained by more than one way, while difficulties remain in the identification of the possible origin of the detected long-time period variation. Furthermore, the possible modulation of a W-class W UMa-type light curve by the Applegate mechanism is also examined.

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