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We obtained optical spectroscopy of close (< 80 kpc) companion objects of asample of 12 low redshift quasars (z < 0.3 ) selected from the SDSS Stripe82area and that are in the subsample of 52 QSOs for which both multicolor hostgalaxies properties and galaxy environment was recently investigated in detail.We found that for 8 out of 12 sources the companion galaxy is associated to theQSO having a difference of radial velocity that is less than 400 km/s. Many ofthese associated companions exhibit [OII] $\lambda$3727 \AA~ emission linessuggestive of episodes of (recent) star formation possibly induced by pastinteractions. The SFR of the companion galaxies as derived from [OII] lineluminosity is, however, modest, with a median value of 1.0 +-0.8 M_sun/yr, andthe emission lines are barely consistent with expectation from gas ionizationby the QSO. The role of the QSO for inducing star formation in close companiongalaxies appears meager. For three objects we also detect the starlightspectrum of the QSO host galaxy which is characterized by absorption lines ofold stellar population and [OII] emission line.

Low redshift quasars in the SDSS Stripe 82: Associated companion galaxies and signature of star formation