  We present the preliminary results of a frequency and line-profile analysis
of the CoRoT gamma Dor candidate HD171834. The data consist of 149 days of
CoRoT light curves and a ground-based dataset of more than 1400 high-resolution
spectra, obtained with six different instruments. Low-amplitude frequencies
between 0 and 5 c/d, dominated by a frequency near 0.96 c/d and several of its
harmonics, are detected. These findings suggest that HD171834 is not a mere
gamma Dor pulsator and that stellar activity plays an important role in its
variable behaviour.
  Based on CoRoT space data and on ground-based observations with ESO
Telescopes at the La Silla Observatory under the ESO Large Programmes ESO LP
178.D-0361 and ESO LP 182.D-0356 (FEROS/2.2m and HARPS/3.6m), and data
collected with FOCES/2.2m at the Centro Astronomico Hispano Aleman at Calar
Alto, SOPHIE/1.93m at Observatoire de Haute Provence, FIES/NOT at Observatorio
del Roque de los Muchachos, and HERCULES/1.0m at Mount John University
Observatory.
