Extremely Low Mass Ratio Contact Binaries. I. The First Photometric and Spectroscopic Investigations of Ten Systems

@article{Li2022ExtremelyLM,
  title={Extremely Low Mass Ratio Contact Binaries. I. The First Photometric and Spectroscopic Investigations of Ten Systems},
  author={Kai Li and Xiang Gao and Xin-Yi Liu and Xing Gao and Ling Li and Xinfa Chen and Guoyou Sun},
  journal={The Astronomical Journal},
  year={2022},
  volume={164}
}
The photometric and spectroscopic investigations of ten contact binaries were presented for the first time. It is discovered that the mass ratios of all the ten targets are smaller than 0.15, they are extremely low mass ratio contact binaries. Seven of them are deep contact binaries, two are medium contact binaries, while only one is a shallow contact system. Five of them show the O’Connell effect, and a dark spot on one of the two components can lead to a good fit of the asymmetric light… 

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