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We present a study of age-related spectral signatures observed in 25 younglow-mass objects that we have previously determined as possible kinematicmembers of five young moving groups: the Local Association (Pleiades movinggroup, age=20 - 150 Myr), the Ursa Major group (Sirius supercluster, age=300Myr), the Hyades supercluster (age=600 Myr), IC 2391 supercluster (age=35--55Myr) and the Castor moving group (age=200 Myr).  In this paper we characterize the spectral properties of observed high or lowresolution spectra of our kinematic members by fitting theoretical spectraldistributions.  We study signatures of youth, such as lithium {\sc i} 6708 \AA, H$\alpha$emission and other age-sensitive spectroscopic signatures in order to confirmthe kinematic memberships through age constraints.  We find that 21 ($84\%$) targets show spectroscopic signatures of youth inagreement with the age ranges of the moving group to which membership isimplied. For two further objects, age-related constraints remain difficult todetermine from our analysis. In addition, we confirm two moving group kinematiccandidates as brown dwarfs.

Spectroscopic signatures of youth in low-mass kinematic candidates of young moving groups