2012MNRAS.422.3535B

We present the mode identification of frequencies found in spectroscopic observations of the γ Doradus star HD 135825. Four frequencies were successfully identified: 1.3150±0.0003, 0.2902±0.0004, 1.4045 ± 0.0005 and 1.8829±0.0005/d. These correspond to (l, m) modes of (1, 1), (2, -2), (4, 0) and (1, 1), respectively. Additional frequencies were found but they were below the signal-to-noise ratio limit of the Fourier spectrum and not suitable for mode identification. The rotational axis inclination and v sin i of the star were determined to be 87° (nearly edge-on) and 39.7 km/s (moderate for γ Doradus stars), respectively. A simultaneous fit of these four modes to the line profile variations in the data gives a reduced χ² of 12.7. We confirm, based on the frequencies found, that HD 135825 is a bona fide γ Doradus star.