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Full-Text Articles in Physical Sciences and Mathematics
Redshifted Absorption At He I Λ10830 As A Probe Of The Accretion Geometry Of T Tauri Stars, William Fischer, John Kwan, Suzan Edwards, Lynne A. Hillenbrand
Redshifted Absorption At He I Λ10830 As A Probe Of The Accretion Geometry Of T Tauri Stars, William Fischer, John Kwan, Suzan Edwards, Lynne A. Hillenbrand
Astronomy: Faculty Publications
We probe the geometry of magnetospheric accretion in classical T Tauri stars (CTTSs) by modeling red absorption at He I λ10830 via scattering of the stellar and veiling continua. Under the assumptions that the accretion flow is an azimuthally symmetric dipole and helium is sufficiently optically thick that all incident 1 μm radiation is scattered, we illustrate the sensitivity of He I λ10830 red absorption to both the size of the magnetosphere and the filling factor of the hot accretion shock. We compare model profiles to those observed in 21 CTTSs with subcontinuum redshifted absorption at He I λ10830 and …
Modeling T Tauri Winds From He I Λ10830 Profiles, John Kwan, Suzan Edwards, William Fischer
Modeling T Tauri Winds From He I Λ10830 Profiles, John Kwan, Suzan Edwards, William Fischer
Astronomy: Faculty Publications
The high opacity of He I λ10830 makes it an exceptionally sensitive probe of the inner wind geometry of accreting T Tauri stars. In this line, blueshifted absorption below the continuum results from simple scattering of stellar photons, a situation that is readily modeled without definite knowledge of the physical conditions and recourse to multilevel radiative transfer. We present theoretical line profiles for scattering in two possible wind geometries, a disk wind and a wind emerging radially from the star, and compare them to observed He I λ10830 profiles from a survey of classical T Tauri stars. The comparison indicates …