Astrophysics

    

Retrograde Spin-Orbit Coupling Effects on the Apsidal Motion of Eclipsing Binary Star Systems: the Case of V541cygni

Authors: M.E.Hassani

It is usually known that the line of apsides of eclipsing binary star systems precesses due to general relativistic effects and classical (Newtonian) tidal and rotational deformations of the stars, whose rotation axes are assumed normal to the orbital plane. For almost all binaries, the expected theoretical and observed apsidal motion rates are in agreement. However, some systems –V541 Cygni, V1143 Cygni, V459 Cassiopeia and AS Camelopardalis – have broken this agreement and resisted explanation for a long time. In this study, we are exclusively dealt with V541 Cygni. We present very tentative theoretical evidence in support of the hypothesis that the retrograde spin-orbit coupling of system causes orbital plane precession in the direction opposite to the relativistic apsidal motion when the spin angular momentum vector is not aligned with the orbital angular momentum vector, thereby reconciling the theoretical and observational result.

Comments: 5 Pages; 27 References

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Submission history

[v1] 2013-04-23 15:07:34
[v2] 2013-05-19 07:09:41

Unique-IP document downloads: 434 times

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