A possible solution to the mass-loss problem in M-type AGB stars

Details A possible solution to the mass-loss problem in M-type AGB stars A possible solution to the mass-loss problem in M-type AGB stars

2010-11-09

arxiv.org/abs/1011.2068v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

To appear in the proceedings of Why Galaxies Care About AGB stars II

Scientific paper

Mass loss is a fundamental, observationally well-established feature of AGB stars but many aspects of this process still remain to be understood. To date, self-consistent dynamical models of dust-driven winds reproducing the observed mass-loss rates seem only possible for M-type stars if the grains in the close circumstellar environment grow to larger sizes than previously assumed. In order to study the grain-size distribution where the mass loss is initiated, high-spatial-resolution interferometry observations are necessary. We have observed two M-type stars using the VLTI/MIDI instrument to constrain the dust-grain sizes through modeling the 10-micron silicate feature. Complementary observations are scheduled and we will present preliminary results.

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