Giant H II regions and the formation of populous star clusters

Statistics – Computation

Scientific paper

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Globular Clusters, H Ii Regions, Star Clusters, Stellar Interiors, Stellar Luminosity, Black Holes (Astronomy), Computational Astrophysics, Late Stars, Magellanic Clouds, Stellar Cores, Stellar Coronas

Scientific paper

The authors critically examine the hypothesis, previously suggested by several authors, that populous "blue globular" star clusters may be forming in 30 Doradus and other nearby giant H II regions. A simple cluster evolution and photoionization model has been used to estimate the initial ionizing luminosities of the populous clusters in the LMC, and the results have been compared to the actual luminosities of giant H II regions. The authors have also compiled the available data on H II region and star cluster populations in galaxies, in order to compare the systematic trends in the populations with Hubble type, and to compare formation rates for the two types of objects. They have re-examined the structure of the stellar cores of 30 Doradus and other nearby giant H II regions, and compared their properties to the LMC clusters. The results suggest that populous clusters may be forming in giant H II regions, but only a small fraction of giant H II regions are likely to contain such clusters. The apparent absence of both giant H II regions and populous clusters in early-type galaxies may be caused by a deficiency of massive interstellar clouds in these systems.

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