KINEMATICS OF THE VERY YOUNG NEBULA N-59 AT THE EDGE OF THE SUPERSHELL LMC-4

The dynamics of the nebula N59 (B053540-6736), located at the boundary of the supershell LMC 4 in the Large Magellanic Cloud, is studied usi ng a scanning Fabry-Perot interferometer. It is shown that the nebulae NGC 2032 and 2035, which form the bright core of the H II region N 59 A (B0535306736), belong to a single H II region which looks divided du e to the presence of a heavy dust lane. This bright core presents an e xpansion motion of 24 km s(-1). The kinetic energy involved in this mo tion is of about 1.5 x 10(49) erg. This value is compatible either wit h a supernova explosion origin or with a formation by the winds of int erior massive stars. Since no clear traces of a SN explosion have been found in this nebula and since the stellar content of N 59A (B053530- 6736) is rich in blue stars, we conclude that these stars, mainly the very massive star HDE 269810 (R122), and probably other stars hidden b y the dust lane, are sufficient in providing the wind power to drive t he expansion motion. The dust lane seems to be mixed in with the nebul ar gas and the stars, suggesting a site where star formation may still take place. An extended shell, probably ionized by the star R122, has been detected at the same velocities as the slab, at blueshifted velo city, seen in the foreground absorption. The star R122 contributes to the high excitation of the faint diffuse gas, and perhaps of some fart her nebulae. To the East, the SNR 0536-676 remains as a trace of the e xistence of another massive s tar which had already exploded. The kine matics of N 59B (B053610-6736) which contains the SNR 0536-676, is als o studied corroborating the results of previous studies.