X-ray-selected t Tauri stars in the Chamaeleon I cloud

David P. Huenemoerder, Warrick A. Lawson, Eric D. Feigelson

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Abstract

We report spectroscopy of 26 stars associated with 23 fields containing proposed new X-ray-selected cloud members of Chamaeleon I. At least 13, and possibly as many as 19, of the stars are confirmed to be new 'weak-lined' T Tauri (WTT) stars due to the presence of Hα emission and strong λ6707 Li I absorption. Of the remainder, we suspect that five of the observed stars are not the X-ray emitters. Only two X-ray-emitting stars are found to be unrelated to the cloud. The available evidence suggests that the WTT stars are not systematically older than 'classical' T Tauri (CTT) stars in Chamaeleon. The transition between CTT and WTT stages for individual stars must range over most of the Hayashi track.

Original languageEnglish (US)
Pages (from-to)967-975
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume271
Issue number4
DOIs
StatePublished - Jan 1 1994

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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