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Eclipsing binaries with eccentric orbits Waldemar Ogoza www.as.up.krakow.pl Slide 2 4 source of information: Slide 3 C = M O + P E M O time of referenced eclipse P period E - epoch Slide 4 O-C Slide 5 Slide 6 Period variations diven by: Mass transfer Mass ejection 3 body Apsidal motion Magnetic braking Emission of gravitational waves Slide 7 Diagram O-C Slide 8 Slide 9 http://astro.unl.edu/naap/ebs/animations/ebs.html Slide 10 e=0.5 Slide 11 Slide 12 Gravitational breaking Slide 13 Magnietic breaking Slide 14 Orbital circularisation and synchronization * radiative Slide 15 * convective: Slide 16 Pri: = /2 - Sec: =3 /2 - - True anomaly - Mean anomaly = 2 (t-t o ) /P Slide 17 Case: i 90 Slide 18 Slide 19 Slide 20 Why d /dt 0 Slide 21 Slide 22 Slide 23 Slide 24 Slide 25 Slide 26 Slide 27 Slide 28 Slide 29 Links www.as.ap.krakow.pl/o-c www.as.ap.krakow.pl/ephem