THE LIGHT CURVE SHAPES AS A KEY TO RESOLVING THE ORIGIN OF LONG SECONDARY PERIODS IN RED GIANT STARS

@article{Soszyski2014THELC,
  title={THE LIGHT CURVE SHAPES AS A KEY TO RESOLVING THE ORIGIN OF LONG SECONDARY PERIODS IN RED GIANT STARS},
  author={Igor Soszyński and Andrzej Udalski},
  journal={The Astrophysical Journal},
  year={2014},
  volume={788}
}
We present a study of Optical Gravitational Lensing Experiment light curves of red giant stars exhibiting long secondary periods (LSPs)—an enigmatic phenomenon commonly observed in stars on the upper red giant branch and asymptotic giant branch. We show that the light curves of LSP stars are essentially identical to those of the spotted variables with one dark spot on their photospheres. Such behavior can be explained by the presence of a dusty cloud orbiting the red giant together with a low… 

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