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 G. Micela and Salvatore Sciortino and Keivan G. Stassun and Beate Stelzer and Hans Zinnecker},
  journal={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-rayemissionofpre–main-sequencestars.Inthispaper,westudythenearly600X-raysourcesthatcanbereliably identified with optically well-characterized T Tauri stars (TTSs) in the Orion Nebula Cluster. With a detection limit of LX; min � 10 27:3 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) cluster stars… 
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The X-ray properties of twenty ~1 Myr old O, B, and A stars of the Orion Trapezium are examined with data from the Chandra Orion Ultradeep Project (COUP). On the basis of simple theories for X-ray…
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