An X-Ray Census of Young Stars in the Chamaeleon I North Cloud

  title={An X-Ray Census of Young Stars in the Chamaeleon I North Cloud},
  author={Eric D. Feigelson Warrick A. Lawson},
  journal={The Astrophysical Journal},
Sensitive X-ray imaging surveys provide a new and effective tool to establish the census of pre-main-sequence (PMS) stars in nearby young stellar clusters. We report here a deep Chandra X-Ray Observatory observation of PMS stars in the Chamaeleon I North cloud, achieving a limiting luminosity of log Lt 27 ergs s-1 (0.5-8 keV band) in a 0.8 × 0.8 pc2 region. Of the 107 X-ray sources, 37 are associated with Galactic stars of which 27 are previously recognized cloud members. These include three… 

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