Centrifugally Driven Winds from Protostellar Disks. II. Forbidden-Line Emission in T Tauri Stars

Details Centrifugally Driven Winds from Protostellar Disks. II. Forbidden-Line Emission in T Tauri Stars Centrifugally Driven Winds from Protostellar Disks. II. Forbidden-Line Emission in T Tauri Stars

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...408..148s&link_type=abstract

Astrophysical Journal v.408, p.148

Astronomy and Astrophysics

Astronomy

40

Ism: Jets And Outflows, Line: Formation, Line: Profiles, Magnetohydrodynamics: Mhd, Stars: Pre-Main-Sequence

Scientific paper

I calculate the forbidden-line emission from a radially self-similar wind that is driven centrifugally by a large- scale magnetic field from the surface of a weakly ionized, Keplerian disk. The wind is heated by ambipolar diffusion, and its thermal structure is computed self-consistently. I apply this model to the interpretation of the forbidden-line emission in T Tauri stars, and make detailed comparisons with the observations. The model successfully accounts for the observed line luminosities and explains the observed correlation between the [S II] λ6731 and the [O I] λ6300 luminosities in terms of the mass outflow rate and the ratio of the mass accretion and the mass outflow rates. Observables that are more geometry-dependent, such as the line profiles and the [S II] λ6731/[S II] λ6717 line ratios, are reproduced less successfully (owing to the assumed self- similarity) but give useful constraints on the underlying wind geometry and density stratification. I also show that, in the context of this model, the line emission originates in a region with a smaller obscuration than that deduced for the central object, indicating that reddening corrections based on the extinction to the central star may lead to overestimates of the line luminosities.

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