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

2. 4 source of information:

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

4. O-C

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

7. Diagram O-C

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

10. e=0.5

12. Gravitational breaking

13. Magnietic breaking

14. Orbital circularisation and synchronization * radiative

15. * convective:

16. Pri:  =  /2 -  Sec:  =3  /2 -  - True anomaly - Mean anomaly  = 2  (t-t o ) /P

17. Case: i  90

20. Why d  /dt  ≠ 0

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