The kinematics and origin of SMR stars

Ages and kinematics are revised for SMR stars ([M/H] >+0.30) common to NLTT and HIPPARCOS catalogues. The origin of MR to SMR stars appears heterogene ous: part of them, of intermediate age, were formed few kpc inside the sola r orbit, from slowly enriched gas, whereas the oldest SMRs were born early, closer to the galactic center where the metal-enrichment had been fast. Pe rturbations by the galactic bar explain the peculiar motions of local SMRs as well as their outwards migration.