The Spectroscopic Variability of He I Emission Line in AB Aurigae

We performed the spectroscopic observations for HeI 5876pAline in the Herbig Ae star AB Aurigae with the Bisei Astronomical Observatory (BAO) 1.01-m telescope during three years from 1998 to 2000. The profiles of HeI line showed the strong variability, which consisted of the blue and the red shifted components with periods of 35 hrs and 46 hrs, respectively. We suggest that the blue shifted component is generated near the stellar surface in the base of the stellar wind.