User:Wingman4l7/Struve-Sahade Effect

http://arxiv.org/abs/0708.3005

http://articles.adsabs.harvard.edu/full/1997Obs...117...37S

http://orbi.ulg.ac.be/handle/2268/2907

http://aspbooks.org/custom/publications/paper/367-0393.html

http://aas.org/archives/BAAS/v32n4/aas197/919.htm Observations of the Struve-Sahade Effect with the Multiple Telescope Telescope

http://iopscience.iop.org/0004-637X/527/1/353/fulltext The Struve-Sahade Effect: A Tale of Three Stars

Otto Struve

In 1937, Struve discovered a phenomenon which was later named the Struve-Sahade effect (S-S effect), that is the apparent weakness of lines of the secondary star in massive binary stars when the secondary is receding. This effect poses problems for the accurate reconstruction of the separated primary and secondary spectra.

Spica

The secondary member of this system is one of the few stars to display the Struve-Sahade Effect. This is an anomalous change in the strength of the spectral lines over the course of an orbit, where the lines become weaker as the star is moving away from the observer.