The atmospheric parameters, abundances and magnetic field of the AR piscium primary

The high resolution, high S/N spectra for the chromospherically active binary AR Psc (=HD 8357) has been obtained by using the Coudé echelle spectrograph of the 2.16 m telescope of Beijing Astronomical Observatory. The Hα lines present emission above the continuum and the profiles of CaII IRT2 (λ 854.2 nm) & IRT3 (λ 866.2 nm) show core emission. The net chromospheric flux of the had been calculated by using spectral subtraction. A detailed spectroscopic analysis and model calculation have yielded the atmospheric parameters of the primary of AR Psc. The abundances of 9 elements has been obtained. And, the measurement of Magnetic field have been made using the Stenflo-Lindegren statistical analysis and the profile-addition technique. A magnetic field strength B = 2400 ± 300 G and a filling factor α = 0.45 ± 0.05 are obtained.