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Eclipsing binaries with eccentric orbits Waldemar Ogłoza www.as.up.krakow.pl

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4 source of information:

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C = M O + P E M O – time of referenced eclipse P – period E - epoch

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O-C

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Period variations diven by: Mass transfer Mass ejection 3 body Apsidal motion Magnetic braking Emission of gravitational waves …

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Diagram O-C

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http://astro.unl.edu/naap/ebs/animations/ebs.html

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e=0.5

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Gravitational breaking

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Magnietic breaking

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Orbital circularisation and synchronization * radiative

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* convective:

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Pri: = /2 - Sec: =3 /2 - - True anomaly - Mean anomaly = 2 (t-t o ) /P

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Case: i 90

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Why d /dt ≠ 0

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Links www.as.ap.krakow.pl/o-c www.as.ap.krakow.pl/ephem

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