  He I 10830 profiles acquired with Keck's NIRSPEC for 6 young low mass stars
with high disk accretion rates (AS 353A, DG Tau, DL Tau, DR Tau, HL Tau and SVS
13) provide new insight into accretion-driven winds. In 4 stars the profiles
have the signature of resonance scattering, and possess a deep and broad
blueshifted absorption that penetrates more than 50% into the 1 micron
continuum over a continuous range of velocities from near the stellar rest
velocity to the terminal velocity of the wind, unlike inner wind signatures
seen in other spectral features. This deep and broad absorption provides the
first observational tracer of the acceleration region of the inner wind and
suggests that this acceleration region is situated such that it occults a
significant portion of the stellar disk. The remaining 2 stars also have blue
absorption extending below the continuum although here the profiles are
dominated by emission, requiring an additional source of helium excitation
beyond resonant scattering. This is likely the same process that produces the
emission profiles seen at He I 5876.
