Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-07-14
Astronomy and Astrophysics
Astrophysics
10 pages, 11 figures. Accepted for publication in Astronomy & Astrophysics Main Journal
Scientific paper
We present new imaging and spectroscopy of the post-red supergiant binary AFGL 4106. Coronographic imaging in H-alpha reveals the shape and extent of the ionized region in the circumstellar envelope (CSE). Echelle spectroscopy with the slit covering almost the entire extent of the CSE is used to derive the physical conditions in the ionized region and the optical depth of the dust contained within the CSE. The dust shell around AFGL 4106 is clumpy and mixed with ionized gas. H-alpha and [N II] emission is brightest from a thin bow-shaped layer just outside of the detached dust shell. On-going mass loss is traced by [Ca II] emission and blue-shifted absorption in lines of low-ionization species. A simple model is used to interpret the spatial distribution of the circumstellar extinction and the dust emission in a consistent way.
Molster Frank J.
van Loon Jacco Th.
Waters Laurens B. F. M.
Winckel Hans Van
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