On the Interpretation of Magnetic Field-Strengths Measurements for T Tauri Stars

Details On the Interpretation of Magnetic Field-Strengths Measurements for T Tauri Stars On the Interpretation of Magnetic Field-Strengths Measurements for T Tauri Stars

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.0513s&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #05.13; Bulletin of the American Astronomical Society, Vol. 29, p.1215

Astronomy and Astrophysics

Astronomy

Scientific paper

Recent mesurements of magnetic field strengths in T Tauri stars yield values 1--4kG. Models of magnetic accretion for these objects use these measurements to compute the field-strength at distances of order several stellar radii---usually assuming a r(-3) dependence. Here I point out that the observed values correspond to photospheric field strengths, and that in the transition from the photosphere to the stellar corona the field weakens much faster than predicted by a r(-3) dependence. I show that, when computing the field at large distances from the star, the appropiate initial value is B_* ~ 0.1kG rather than B_* ~ 1kG as currently assumed.

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