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Archive | 2000

Orbital Period Changes and Global Evolution of Contact Binaries

Helen Rovithis-Livaniou; Anastassios Kalimeris

Numerical models has shown that thermal or dynamical processes drive the close binary evolution faster than the classic chemical evolution of their interiors. (e.g. Iben & Tutukov, 1984;Sarna & Federova, 1989;van’t Veer & Maceroni, 1990;Maceroni & van’t Veer, 1991 etc). Especially for contact systems, thermal and/or dynamical instabilities formulate evolutionary scenaria, which are taking place in thermal time-scales and even faster. It seems that contact binaries’ evolution is controlled by two principal evolutionary mechanisms: the thermal relaxation oscillations (TRO) and the tidal (or dynamical, or orbital) instability.


Astronomy and Astrophysics | 1994

On the orbital period changes in contact binaries

Anastassios Kalimeris; Helen Rovithis-Livaniou; Peter Rovithis


Archive | 2003

On the origin of the orbital period changes of V523 Cas

Helen Rovithis-Livaniou; Sotirios Tsantilas; Anastassios Kalimeris


Astronomy and Astrophysics | 1994

An orbital period study of the contact system AB Andromedae

Anastassios Kalimeris; Helen Rovithis-Livaniou; Peter Rovithis; G. Oprescu; Adrian Dumitrescu; Marian Doru Suran


The Light-Time Effect in Astrophysics: Causes and cures of the O-C diagram | 2005

Period Study of the Contact Binary AW UMa

Helen Rovithis-Livaniou; Sotirios Tsantilas; Anastassios Kalimeris; P. Rovithis; G. Djurašević; Irina Voloshina


Archive | 2005

Orbital period changes of the eclipsing binaries OO Aquilae and V471 Tauri

Helen Rovithis-Livaniou; Sotirios Tsantilas; Anastassios Kalimeris; Peter Rovithis


Archive | 2003

Influence of spots on O-C diagrams of close eclipsing binary stars

Helen Rovithis-Livaniou; Anastassios Kalimeris; Peter Rovithis


Archive | 2001

Orbital Period Behaviour of Some Semi-Detached Eclipsing Binaries during the Last Decades

Helen Rovithis-Livaniou; Anastassios Kalimeris; A. N. Kranidiotis; George Athanassiades; Peter Rovithis


Archive | 2001

Observed Properties of Contact Binary Systems

Anastassios Kalimeris; Helen Rovithis-Livaniou


Archive | 2001

Gravity distribution on the surfaces of contact binaries

Sotirios Tsantilas; E. Livaniou-Rovithis; Anastassios Kalimeris

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Helen Rovithis-Livaniou

National and Kapodistrian University of Athens

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Peter Rovithis

National and Kapodistrian University of Athens

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Sotirios Tsantilas

National and Kapodistrian University of Athens

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A. N. Kranidiotis

National and Kapodistrian University of Athens

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Irina Voloshina

Sternberg Astronomical Institute

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