T-Chamaeleontis - a Weak-Line Yy-Orionis Star

Details T-Chamaeleontis - a Weak-Line Yy-Orionis Star T-Chamaeleontis - a Weak-Line Yy-Orionis Star

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...272..225a&link_type=abstract

Astronomy and Astrophysics, Vol.272, NO. 1/MAYI, P. 225, 1993

Astronomy and Astrophysics

Astrophysics

36

Stars: T Cha, Stars: Pre-Main-Sequence, Photometry, Spectroscopy

Scientific paper

We present new low and high resolution spectroscopy and optical photometry of the star T Cha. From the low resolution spectroscopy we classify T Cha as a G8 type star. We also identify T Cha as the optical counterpart of the ROSAT all- sky survey X-ray source RX J1 157.2-7921. On the basis of the physical association with the Chamaeleon cloud complex, the erratic photometric variability and colour behaviour, the presence of Hα emission and of strong Li λ 6708 absorption line, as well as its position on the HR diagram, we establish unambiguously the low-mass PMS nature of the star.
These characteristics, combined with an observed equivalent width of the Hot emission less than 10 Å, suggest that the star can be classified as a weak-line T Tauri star. However, the strong IR excess of the star, resembling more closely those of classical T Tauri stars, clearly indicates the presence of a circumstellar disk.
From spectra obtained at different epochs we find that strong variability is present in the Hot line, with the profile changing from pure emission to an inverse P Cygni on a time scale of one day or less. Actually, T Cha is the first case in which an inverse P Cygni profile is observed at Hα. Hence, here we suggest that T Cha can be considered a case of "weak-line" YY Orionis star.

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