Ej. Kennelly et Gah. Walker, THE LINE-PROFILE VARIATIONS OF THETA(2) TAURI, Publications of the Astronomical Society of the Pacific, 108(722), 1996, pp. 327-331
Citations number
25
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Publications of the Astronomical Society of the Pacific
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.