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We present the preliminary results of a frequency and line-profile analysisof the CoRoT gamma Dor candidate HD171834. The data consist of 149 days ofCoRoT light curves and a ground-based dataset of more than 1400 high-resolutionspectra, obtained with six different instruments. Low-amplitude frequenciesbetween 0 and 5 c/d, dominated by a frequency near 0.96 c/d and several of itsharmonics, are detected. These findings suggest that HD171834 is not a meregamma Dor pulsator and that stellar activity plays an important role in itsvariable behaviour.  Based on CoRoT space data and on ground-based observations with ESOTelescopes at the La Silla Observatory under the ESO Large Programmes ESO LP178.D-0361 and ESO LP 182.D-0356 (FEROS/2.2m and HARPS/3.6m), and datacollected with FOCES/2.2m at the Centro Astronomico Hispano Aleman at CalarAlto, SOPHIE/1.93m at Observatoire de Haute Provence, FIES/NOT at Observatoriodel Roque de los Muchachos, and HERCULES/1.0m at Mount John UniversityObservatory.

The variability of the CoRoT target HD171834: gamma Dor pulsations and/or activity?