Measurement of the Longitudinal Magnetic-Field Component for FU Ori

Details Measurement of the Longitudinal Magnetic-Field Component for FU Ori Measurement of the Longitudinal Magnetic-Field Component for FU Ori

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003astl...29..258s&link_type=abstract

Astronomy Letters, vol. 29, p. 258-262 (2003)

Astronomy and Astrophysics

Astronomy

2

Scientific paper

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 (3 sigma) 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 H_alpha 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 H_alpha 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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