Abstract
We address the problem of mass loss from T Tauri stars. We show that, as deduced from the H..cap alpha.. line intensity alone, the mass loss rates from the ''average'' T Tauri star (M/sub asterisk/ = 0.75 M/sub sun/, r/sub s/ = 3 R/sub sun/, L/sub s/ = 3 L/sub sun/) have an ambiguity of at least three orders of magnitude. Most T Tauri stars present nearly symmetric line profiles; in these cases the mass loss rate could just as well be equal to zero. In cases where an asymmetric profile presents evidence for mass loss, optical and ultraviolet observations covering time variability can be used to reduce the large ambiguity in the mass loss rate.
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