Document Type
Article
Publication Date
12-10-2003
Publication Title
The Astrophysical Journal
Abstract
He I 10830 profiles acquired with Keck's NIRSPEC for six 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 four of the stars, the profiles have the signature of resonance scattering, and they possess a deep and broad blueshifted absorption that penetrates more than 50% into the 1 m 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 two 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 Å.
Keywords
planetary systems: protoplanetary disks, stars: formation, stars: pre–main-sequence, stars: winds, outflows
Volume
599
First Page
L41
Last Page
L44
Rights
© 2003. The American Astronomical Society. All rights reserved.
Recommended Citation
Edwards, Suzan; Fischer, William; Kwan, John; Hillenbrand, L.; and Dupree, Andrea K., "He I λ10830 as a Probe of Winds in Accreting Young Stars" (2003). Astronomy: Faculty Publications, Smith College, Northampton, MA.
https://scholarworks.smith.edu/ast_facpubs/17
Comments
Archived as published.