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 with a scanning Fabry-Perot interferometer at H and (OIII)5007 wavelengths. The kinematics of this eld showshighvelocitymotions.Wediscusstheirorigin: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 windsoftheembbededstars.ThenthenebulaN 103islinkedto twosupernovaremnantsofdifferentages.Theoldestonecanbe representedbyabubble,152pcwide,seenprojectedagainstthe HIIregion,andprobablylyingattheedgeoftheHIIregion.The exciting stars of the nebula are actually members of the LMC cluster NGC 1850B; they provide a photon flux large enough to ionize the quiet part of the gas.