He I λ 10830 as a Probe of Winds in Accreting Young Stars

Details He I λ 10830 as a Probe of Winds in Accreting Young Stars He I λ 10830 as a Probe of Winds in Accreting Young Stars

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.7704f&link_type=abstract

American Astronomical Society Meeting 203, #77.04; Bulletin of the American Astronomical Society, Vol. 35, p.1323

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Scientific paper

He I λ 10830 profiles acquired with Keck's NIRSPEC for young low mass stars with high disk accretion rates give a unique new probe of inner winds in disk accretion systems. In some stars, blueshifted absorption penetrates more than 50% into the 1 μ m continuum over velocities ranging from near the stellar rest velocity to the terminal velocity of the wind, unlike inner wind signatures seen in other spectral features. This absorption is formed via resonance scattering and provides the first observational tracer of the wind acceleration region. Since the stellar photosphere is a significant contributor to the continuum at this wavelength, the wind acceleration region must be occulting a large portion of the star. In other stars, the profiles are dominated by emission, providing evidence for the presence of a hot inner wind in some stars, as suggested from an earlier study of He I λ 5876 profiles.

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