Early-type stars blow bubbles in the interstellar medium. The radii of the bubbles are typically 30 pc. Typical conditions in their interiors are temperatures of about 1 million K and densities of about 0.01 per cu cm. The dense shell of swept-up interstellar gas that surrounds them is likely to trap the ionization front and may also have an outer layer of H2. The column density of O VI in the interior is in accord with observations by the Copernicus ultraviolet telescope.
CITATION STYLE
Castor, J., Weaver, R., & McCray, R. (1975). Interstellar bubbles. The Astrophysical Journal, 200, L107. https://doi.org/10.1086/181908
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