51 Pegasi - a planet-bearing Maunder minimum candidate

@article{Poppenhaeger200951P,
  title={51 Pegasi - a planet-bearing Maunder minimum candidate},
  author={Katja Poppenhaeger and Jan Robrade and J{\"u}rgen H. M. M. Schmitt and J. C. Hall},
  journal={Astronomy and Astrophysics},
  year={2009},
  volume={508},
  pages={1417-1421}
}
We observed 51 Peg, the first detected planet-bearing star, in a 55 ks XMM-Newton pointing and in 5 ks pointings each with Chandra HRC-I and ACIS-S. The star has a very low count rate in the XMM observation, but is clearly visible in the Chandra images due to the detectors' different sensitivity at low X-ray energies. This allows a temperature estimate for 51 Peg's corona of $T\la 1$ MK; the detected ACIS-S photons can be plausibly explained by emission lines of a very cool plasma near 200 eV… 

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