One of those events was well observed on the 5th night of the run. The first figure below shows the behavior of H during the run. The sinusoidal component reflects rotational modulation of a non-uniform chromosphere. The flare is obvious. The second figure shows flare components of the H and He D 3 line profiles.
Time increases upward.
The narrow He line appears only during the flares. Kitt Peak 2.1-m telescope to obtain series of spectra of several classical T Tauri stars to study their stellar activity, accretion, and binarity. Their observing run in 1994 December lasted 7 nights. The number of spectra obtained for each target depended on target priority and brightness, and was subject to limitation due to bad weather conditions. Selection criteria for CTTS were more relaxed than the WTTS criteria above because no available targets meet the latter.