The spiral structure of the Large Magellanic Cloud

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Galactic Structure, Magellanic Clouds, Spiral Galaxies, Galactic Rotation, H Alpha Line, H Ii Regions, M Stars, Open Clusters, Star Distribution, Supergiant Stars, Supernova Remnants, X Ray Sources

Scientific paper

The authors study the structure of the Large Magellanic Cloud (LMC) on the basis of the distribution of typical spiral indicators such as H-alpha regions, supergiants, dark clouds, associations, young open star clusters, X-ray sources, supernova remains, C-stars, M-stars, and delta Cephei stars, and on the basis of the distribution of neutral atomic hydrogen. The first two of these indicators suggest quite clearly that the LMC is a spiral nebula with structural center being the enormous H-II region 30 Doradus. The distribution of H I in the LMC is irregular. The rotation curve of the LMC is fairly regular, but its center does not lie in the center of the bar, but close to the centroid of the OB-associations and supergiants. The LMC is classified on the basis of the distribution of the extreme Population I in the Hubble system as Scp, the peculiarity being its asymmetry.

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