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Astron. Astrophys. 319, 973-980 (1997)

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High velocity motions inside the HII region N 103 of the Large Magellanic Cloud *

P. Ambrocio-Cruz 1, 2, A. Laval 1, M. Marcelin 1 and P. Amram 1

1 Observatoire de Marseille, 2 Place Le Verrier, F-13248 Marseille Cedex 04, France
2 Instituto de Astronomía, UNAM, Apdo. 70-264, México, D.F., 04510, México

Received 6 June 1996 / Accepted 12 September 1996

Abstract

We have observed the HII region N 103 of the Large Magellanic Cloud with a scanning Fabry-Perot interferometer at H [FORMULA] and [OIII]5007 wavelengths. The kinematics of this field shows high velocity motions. We discuss 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 winds of the embbeded stars. Then the nebula N 103 is linked to two supernova remnants of different ages. The oldest one can be represented by a bubble, 152 pc wide, seen projected against the HII region, and probably lying at the edge of the HII region. 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.

Key words: ISM: bubbles – ISM: HII regions – ISM: individual objects: N 103 – ISM: kinematics and dynamics – ISM: supernova remnants – galaxies: Magellanic Clouds

* Based on observations collected at the European Southern Observatory

Present address: Observatoire de Marseille, 2, Place Leverrier, 13248 Marseille Cedex 4, France

Send offprint requests to: P. Ambrocio-Cruz

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© European Southern Observatory (ESO) 1997

Online publication: July 3, 1998
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