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We investigate the extinction together with the radial velocity dispersionand distribution of red clump stars in the anti-center direction using spectraobtained with Hectospec on the MMT. We find that extinction peaks atGalactocentric radii of about 9.5 and 12.5 kpc, right in front of the locationsof the Perseus and Outer arms and in line with the relative position of dustand stars in external spiral galaxies. The radial velocity dispersion peaksaround 10kpc, which coincides with the location of the Perseus arm, yields anestimated arm-interarm density contrast of 1.3-1.5 and is in agreement withprevious studies. Finally, we discover that the radial velocity distributionbifurcates around 10-11 kpc into two peaks at +27 km/s and -4 km/s. This seemsto be naturally explained by the presence of the outer Lindblad resonance ofthe Galactic bar, but further observations will be needed to understand if thecorotation resonance of the spirals arms also plays a role.

A resonant feature near the Perseus arm revealed by red clump stars