Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...390..622b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 390, no. 2, May 10, 1992, p. 622-633.
Astronomy and Astrophysics
Astrophysics
123
Magnetic Flux, Pre-Main Sequence Stars, Stellar Magnetic Fields, Stellar Spectra, T Tauri Stars, Absorption Spectra, Line Spectra, Spectral Line Width, Zeeman Effect
Scientific paper
Magnetic fields on two weak-emission-line T Tauri stars were detected by searching for the enhancement of the equivalent widths of Zeeman-sensitive absorption lines. For both stars, 26 observed Fe I lines, which represent a wide range of Zeeman sensitivities, are synthesized using an LTE Stokes line-transfer calculation. The theoretical growth of equivalent width with magnetic field is discussed for lines with various Zeeman patterns. Oscillator strengths for all lines are empirically determined a priori using a magnetically quiet star of similar spectral type. The iron abundances of both T Tauri stars are established by synthesizing lines that are insensitive to Zeeman splitting. The observed equivalent widths of Zeeman-sensitive lines in TAP 35 are found to be systematically enhanced relative to those calculated for no magnetic field, while such an enhancement is not seen in Zeeman-insensitive lines.
Basri Gibor
Marcy Geoffrey W.
Valenti Jeff A.
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