Living With a red Dwarf: Rotation and X-ray and Ultraviolet Properties of the Halo Population Kapteyn’s Star

@article{Guinan2016LivingWA,
  title={Living With a red Dwarf: Rotation and X-ray and Ultraviolet Properties of the Halo Population Kapteyn’s Star},
  author={Edward F. Guinan and Scott G. Engle and Allyn J. Durbin},
  journal={The Astrophysical Journal},
  year={2016},
  volume={821},
  pages={81}
}
As part of Villanova's Living with a Red Dwarf program, we have obtained UV, X-ray and optical data of the Population II red dwarf -- Kapteyn's Star. Kapteyn's Star is noteworthy for its large proper motions and high RV of ~+245 km s^-1. As the nearest Pop II red dwarf, it serves as an old age anchor for calibrating Activity/Irradiance-Rotation-Age relations, and an important test bed for stellar dynamos and the resulting X-ray -- UV emissions of slowly rotating, near-fully convective red dwarf… 

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