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Astron. Astrophys. 338, 132-138 (1998)

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5. Conclusions

The use of the COME-ON+ adaptive optics system has allowed us to resolve the dust shell of five late-type stars in the near infrared. These observations, all in agreement with previous high angular resolution ones, clearly show that aspherical dust shell is a common feature of the late stages of stellar evolution, as already concluded from polarization measurements (Johnson & Jones 1991).

The gap between the range of angular resolution from [FORMULA] to [FORMULA] allowed by infrared adaptive optics and the range below [FORMULA] allowed by long baseline interferometry is now disappearing. This leads to a better understanding of both the post-AGB phase, where the dust shells are often extended and generally thick, and the AGB one, where a more tenuous shell is found to be closer to the star.

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© European Southern Observatory (ESO) 1998

Online publication: September 8, 1998