Resumen
Based on observations of H I 21 cm line, the authors report the discovery of a huge H I cavity found toward the stellar association Car OB2. This cavity, seen at velocities similar to that of Car OB2, appears surrounded by a striking expanding H I shell. There seems to be a physical link between these H I features and the OB association. The neutral gas structures found in the ISM at 21 cm would be the consequence of the combined action of both stellar winds and radiation pressure from the hottest members of Car OB2. The authors also analyzed the CO emission in the same region, finding a notorious counterpart with the H I shell. The size and kinematical parameters of the molecular gas almost mimic those of the atomic gas.
