HIGH-VELOCITY MOTIONS INSIDE THE HII REGION N-103 OF THE LARGE-MAGELLANIC-CLOUD

We have observed the HII region N 103 of the Large Magellanic Cloud wi th a scanning Fabry-Perot interferometer at Her and [OIII]5007 wavelen gths. The kinematics of this field shows high velocity motions. We dis cuss their origin: Supernova explosion or particularly strong stellar winds. By calculating the energy input inside the gas, we show that it is unlikely that the high velocity motions are due to the stellar win ds of the embbeded stars. Then the nebula N 103 is linked to two super nova remnants of different ages. The oldest one can be represented by a bubble, 152 pc wide, seen projected against the HII region, and prob ably lying at the edge of the HII region. The exciting stars of the ne bula are actually members of the LMC cluster NGC 1850B; they provide a photon flux large enough to ionize the quiet part of the gas.