The Solar Twin Planet Search: The age - chromospheric activity relation

  title={The Solar Twin Planet Search: The age - chromospheric activity relation},
  author={D. Lorenzo-Oliveira and F. C. Freitas and J. Mel'endez and M. Bedell and I. Ram'irez and J. Bean and M. Asplund and L. Spina and S. Dreizler and A. Alves-Brito and L. Casagrande},
  journal={arXiv: Solar and Stellar Astrophysics},
It is well known that the magnetic activity of solar type stars decreases with age, but it is widely debated in the literature whether there is a smooth decline or if there is an early sharp drop until 1-2 Gyr followed by a relatively inactive constant phase. We revisited the activity-age relation using time-series observations of a large sample of solar twins whose precise isochronal ages and other important physical parameters have been determined. We measured the Ca II H and K activity… Expand

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