The Origin of T Tauri X-Ray Emission: New Insights from the Chandra Orion Ultradeep Project

@article{Preibisch2005TheOO,
  title={The Origin of T Tauri X-Ray Emission: New Insights from the Chandra Orion Ultradeep Project},
  author={Thomas Preibisch and Yong-Cheol Kim and Fabio Favata and Eric D. Feigelson and Ettore Flaccomio and Konstantin V. Getman and Giusi Micela and S. Sciortino and Keivan G. Stassun and Beate Stelzer and Hans Zinnecker},
  journal={The Astrophysical Journal Supplement Series},
  year={2005},
  volume={160},
  pages={401 - 422}
}
The Chandra Orion Ultradeep Project (COUP) provides the most comprehensive data set ever acquired on the X-ray emission of pre-main-sequence stars. In this paper, we study the nearly 600 X-ray sources that can be reliably identified with optically well-characterized T Tauri stars (TTSs) in the Orion Nebula Cluster. With a detection limit of LX, min ~ 1027.3 ergs s-1 for lightly absorbed sources, we detect X-ray emission from more than 97% of the optically visible late-type (spectral types F-M… 
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