N70 - A mass-loss bubble within a massive collapsing H I cloud

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Models, Gravitational Collapse, Magellanic Clouds, Nebulae, Supernova Remnants, H Alpha Line, H Ii Regions, Radial Velocity, Radio Astronomy, Spectrum Analysis, Stellar Mass Ejection

Scientific paper

From a wide variety of observational data, it is concluded that N70, a giant shell H II region in the LMC, is a mass-loss bubble confined by the ram pressure of a massive, collapsing H I cloud, along the lines of the model described by Dopita (1981). From this model, the age, the parameters of the H II region and the H I cloud, the mass-loss rate, and the other properties of the exciting stars are determined. A supernova origin of N70, often suggested for this nebulosity, is shown to be untenable.

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