| Orion's Superbubble (2007) | |||||||||||||
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| . We review the characteristics of the Orion/Eridanus bubble, its relationship to the Orion OB association, and the molecular clouds in the region. We discuss the relationship of the Orion region to other nearby OB associations and cloud complexes including the Gould's Belt system of stars and Lindblad's Ring of gas. Gravitational fragmentation and collapse of the walls of old supershells naturally leads to the formation of giant molecular clouds that can explain the systematic motions in the Solar vicinity. We can use such a model to understand the evolution of the ISM and of star formation within about 600 pc of the Sun over the past 60 Myr. 1. Introduction The interstellar medium (ISM) in the Solar vicinity (within about 0.5--1 kpc) is the only place where the radial velocities and proper motions of stars and their association with gas makes it possible to investigate the distribution and motion of gas and stars in three dimensions. Studies of this gas and associated young stars pe... | |||||||||||||
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