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HI and CO in the circumstellar environment of RS Cnc

Yannick Libert, Observatoire de Paris (LERMA)

Circumstellar shells around red giants are built over long periods of time that may reach several 10^6 years. They may therefore be extended over large sizes ( 1 pc, possibly more) and complementary tracers are needed to describe their global properties. We are engaged in a program designed to gauge the properties of matter in the external parts of circumstellar shells around AGB stars and to relate them to those of the central regions, using the complemetarity of the 21-cm HI and CO rotational line observations. I will illustrate this complementarity by presenting the recent results obtained for RS Cnc, an oxygen-rich AGB star.