User:Wingman4l7/Struve-Sahade Effect

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. ^[1]

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. ^[2]

References

^ Bagnuolo, Jr., William G.; Gies, Douglas R.; Riddle, Reed; Penny, Laura R. (1999). "The Struve‐Sahade Effect: A Tale of Three Stars". The Astrophysical Journal. 527: 353–359. doi:10.1086/308060.
^ Riddle, R. L.; Bagnuolo, W. G.; Gies, D. R. (December 2001). "Spectroscopy of the temporal variations of α Vir". Bulletin of the American Astronomical Society. 33: 1312. Bibcode:2001AAS...199.0613R.{{cite journal}}: CS1 maint: date and year (link) CS1 maint: multiple names: authors list (link)

[1] Bagnuolo, Jr., William G.; Gies, Douglas R.; Riddle, Reed; Penny, Laura R. (1999). "The Struve‐Sahade Effect: A Tale of Three Stars". The Astrophysical Journal. 527: 353–359. doi:10.1086/308060.

[2] Riddle, R. L.; Bagnuolo, W. G.; Gies, D. R. (December 2001). "Spectroscopy of the temporal variations of α Vir". Bulletin of the American Astronomical Society. 33: 1312. Bibcode:2001AAS...199.0613R.{{cite journal}}: CS1 maint: date and year (link) CS1 maint: multiple names: authors list (link)

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