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Gamma Doradus stars are excellent targets for asteroseismology since thegravity modes present in these stars probe the deep stellar interiors. Modeidentification will improve the knowledge of these stars considerably. Aselected group of Gamma Doradus stars and some candidates were observed withthe Mercator telescope to find and/or confirm the periodicities in the lightvariations and to derive reliable amplitude ratios in different pass bands. Afrequency analysis was performed on all new data obtained in the Genevaphotometric system. In order to have more reliable and accurate frequencies,the new data were combined with similar data from the literature and withHipparcos observations. A set of frequencies that minimized the the residualsin a harmonic fit was searched for while allowing means and amplitudes to varyfrom one observation set to another. Frequencies and amplitudes in thephotometric passbands of the Geneva system are given for 21 Gamma Doradusstars. We report the discovery of HD 74504 as a newly found Gamma Doradus star.Our study provides the first extensive multicolour database for theunderstanding of gravity modes in F-type stars.

Long-term photometric monitoring with the Mercator telescope. Frequencies and multicolour amplitudes of $\gamma$ Doradus stars