Measuring the Magnetic Field of the Classical T Tauri Star TW Hydrae
作者： Christopher M. Johns-Krull , Christopher M. Johns-Krull , Christopher M. Johns-Krull , Hao Yang , Jeff A. Valenti
DOI: 10.1086/497070
关键词:
摘要: We present infrared (IR) and optical echelle spectra of the classical T Tauri star TW Hydrae. Using data, we perform detailed spectrum synthesis to fit atomic molecular absorption lines determine key stellar parameters: Teff = 4126 ± 24 K, log g 4.84 0.16, [M/H] -0.10 0.12, 5.8 0.6 km s-1. The IR is used look for Zeeman broadening photospheric lines. four Zeeman-sensitive Ti I near 2.2 μm find that average value magnetic field over entire surface B 2.61 0.23 kG. In addition, several nearby magnetically insensitive CO show no excess above produced by rotation instrumental broadening, reinforcing interpretation width carry out extensive tests quantify systematic errors in our analysis technique may result from inaccurate knowledge effective temperature or gravity, finding reasonable these quantities produce a ~10% uncertainty mean measurement.
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