Long Secondary Periods and Binarity in Red Giant Stars

@article{Soszyski2007LongSP,
  title={Long Secondary Periods and Binarity in Red Giant Stars},
  author={Igor Soszyński},
  journal={The Astrophysical Journal},
  year={2007},
  volume={660},
  pages={1486-1491}
}
  • I. Soszyński
  • Published 16 January 2007
  • Physics
  • The Astrophysical Journal
Observational arguments supporting the binary explanation of the long secondary period (LSP) phenomenon in red giants are presented. Photometry of about 1200 semiregular variables with LSPs in the Large Magellanic Cloud is analyzed using the MACHO and OGLE photometry. For about 5% of these objects, additional ellipsoidal-like or eclipsing-like modulation with the same periods as the LSP is detectable. These double-humped variations are usually shifted in phase compared to LSP light curves. I… Expand

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