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CO in OH/IR-Stars - on Excitation and Mass Loss

  • A. Heske (a1), H.J. Habing (a1), W.E.C.J. van der Veen (a1), A. Omont (a2) and T. Forveille (a2)...

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Observations of CO in long period variables have been widely used to determine mass loss rates by applying models for CO line formation (e.g. Knapp and Morris, 1985) which use a simple method to take the impact from infrared radiation into account. Recent 00(2-1) and (1-0) observations of some more evolved OH/IR stars yielded much too low mass loss rates using these simple models, thus indicating that they cannot be extrapolated to far evolved AGB stars with optically thick circumstellar envelopes.

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CO in OH/IR-Stars - on Excitation and Mass Loss

  • A. Heske (a1), H.J. Habing (a1), W.E.C.J. van der Veen (a1), A. Omont (a2) and T. Forveille (a2)...

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