The O-C diagram of the contact eclipsing binary AB And was reanalysed, using data obtained up to now. It was thus found that the real period variations, presented by the P(E)-Pe function, have changed; both Pmod and its amplitude continue to decrease. Moreover, assuming that the observed
orbital period changes of AB And are due only to magnetic activity, the variation in the magnetic field and also Pmod were calculated. As their variability was found to be less than that of other examined cases, this is connected to the O-C diagram shape of AB And.
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Document Type: Research Article
Department of Physics, Section of Astrophysics, Astronomy and Mechanics, Athens University, Zografos, Athens, Greece
Technological and Educational Institute of the Ionian Islands, Zakynthos, Greece
Institute of Astronomy and Astrophysics, National Observatory of Athens, Athens, Greece
Sternberg Astronomical Institute, Moscow State University, Moscow, Russia
Publication date: 2007-02-01
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