THE LINE-PROFILE VARIATIONS OF THETA(2) TAURI

With a 5.4-hour time series of high-resolution CFHT spectra, the oscil lations of the rapidly rotating delta Scuti star theta(2) Tauri (A7 IV + A5 V) are investigated. Line-profile variations are discovered and identified with the spectrum of the primary star of this binary system . Radial-velocity variations are derived from the data and analyzed to reveal an oscillation frequency near 13.7 cycles day(-1). Variations within the absorption profiles are analyzed with a Fourier-Doppler Ima ging (FDI) technique to reveal that high-degree oscillations with a fr equency of 16.1 cycles day(-1) and an apparent degree of about l=8 are also present in the star. Whereas the low-degree variations of theta( 2) Tau have been shown to be consistent with p-modes of radial order n =2 or 3, the identification of the high-degree variations in terms of pressure modes requires confirmation with theoretical models.