Physics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phdt........10g&link_type=abstract
Ph.D. Thesis Montreal Univ. (Quebec). Dept. de Physique.
Physics
1
Color-Magnitude Diagram, H I Regions, Intergalactic Media, Magellanic Clouds, Stellar Systems, Radial Velocity, Stellar Evolution, Stellar Spectra, Stellar Spectrophotometry
Scientific paper
Fundamental characteristics that are required to understand the nature of the bridge linking the Magellanic Clouds were investigated. Photometry in the B, V, and I bands was applied to five stellar associations in the bridge allowing construction of a precise color-magnitude diagram for each association. The distance and age of these associations was determined along with the radial velocity of some of the stars. It was found that the five associations studied are found at distances on the order of 60 kiloparsecs (kpc), confirming that they belong to the Magellanic System. The age of the associations appears less than 16 million years, much younger than the time since the last hypothetical encounter between the Small and Large Magellanic Clouds. The stars were thus formed near their present position in a relatively tenuous medium. The initial mass function (IMF) has a less pronounced slope than that evaluated by Scalo for the system surrounding the Sun and by Mateo for a sample of Magellanic clusters. Nevertheless, it is comparable with the IMF obtained by Sagar and Richtler for five clusters in the Large Magellanic Cloud and that characterizing the open clusters of the Galaxy. A universal IMF hypothesis is thus favored.
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