X-Ray Selected T-Tauri Stars in the Chamaeleon-I Cloud

Astronomy and Astrophysics – Astronomy

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Scientific paper

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 H emission and strong 26707 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. Key words: stars: magnetic fields - stars: pre-main-sequence - ISM: individual: Chamaeleon I cloud - X-rays: stars.

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