Measurement of the longitudinal magnetic-field component for FU Ori |
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Authors: | D A Smirnov S A Lamzin S N Fabrika |
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Institution: | (1) Sternberg Astronomical Institute, Moscow State University, Universitetskii pr. 13, Moscow, 119992, Russia;(2) Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, Karachai-Cherkessian Republic, 357147, Russia |
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Abstract: | The Main Stellar Spectrograph of the 6-m Special Astrophysical Observatory telescope equipped with a polarimetric analyzer was used to measure the longitudinal magnetic-field component of FU Ori on January 24, 2002. The following (3σ) upper limits were obtained for the magnetic field B‖: B‖<350–400 G in the formation region of Fe I, Ni I, and Ca I absorption lines (disk + wind), and B‖<200 G in the formation region of the absorption component of the Hα line with a P Cyg profile. We conclude that the strength of a large-scale magnetic field capable of collimating the disk wind does not exceed 300 G. For the region where the emission component of the Hα line is formed, we found that B‖<100 G. Such a low value may have been obtained because the magnetic field lines in this region were almost perpendicular to the line of sight at the time of our observations. |
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Keywords: | stars FU Ori stars magnetic field disk accretion stellar wind |
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