Fiber-Optic Magnetometer for Prime Focus of 6-m BTA Telescope Basedon Suspended Echelle Spectrograph

摘要

We have developed and manufactured a fiber-optic magnetometer for the prime focus of the6-m BTA telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences basedon a suspended echelle spectrograph. The magnetometer is designed to improve the spectrum stabilityand eliminate the effect of instrumental polarization of the diagonal mirror on the results of magnetic fieldmeasurements. The magnetometer is to be used for measurements of stellar magnetic fields in stars and to study their chemical composition. The instrument operates in the 5000-6800 A wavelength interval withmean reciprocal dispersion of 0.15 A/pixel. According to the estimates for 9m.5 stars, the standard error ofmagnetic field measurements based on 400 spectral lines would be 100 G for a half-hour exposure.