Abstract
Laboratoire Univ. d’Astroph. de Nice (LUAN), UMR 6525, Parc Valrose, 06108 Nice Cedex 02, FranceReceived 18 June 2005 / Accepted 27 October 2005Abstract. We present results of a spectroscopic study of 37 southern (candidate) γ Doradus stars based on ´echellespectra. The observed spectra were cross-correlated with the standard template spectrum of an F0-type star foran easier detection of binary and intrinsic variations. We identified 15 objects as spectroscopic binaries, including7 new ones, and another 3 objects are binary suspects. At least 12 objects show composite spectra. We coulddetermine the orbital parameters for 9 binaries, of which 4 turn out to be ellipsoidal variables. For 6 binaries, weestimated the expected time-base of the orbital variations. Clear profile variations are observed for 17 objects,pointing towards stellar pulsation. For 8 of them, we have evidence that the main spectroscopic and photometricperiods coincide. Our results, in combination with prior knowledge from the literature, lead to the classificationof 10 objects as new bona-fide γ Doradus stars, 1 object as new bona-fide δ Scuti star, and 8 objects as constantstars. Finally, we determined the projected rotational velocity with two independent methods. The resulting vsinivalues range from 3 to 135 km s
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