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| Paper: |
Interferometric Constraints on Molecule and Dust Formation in
Oxygen-rich Mira stars |
| Volume: |
497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time |
| Page: |
327 |
| Authors: |
Wittkowski, M.; Karovicova, I.; Scholz, M.; Ohnaka, K.; Boboltz, D. A. |
| Abstract: |
We present new results from our project on spatially and
spectrally
resolved multi-epoch near- and mid-infrared interferometric observations
of oxygen-rich Mira stars using the ESO VLT Interferometer (VLTI).
We confirm that the near-IR data are well described by recent
CODEX dynamic model atmospheres, including features of extended
water vapor and CO layers. Our mid-infrared data are consistent with
Al2O3 grains condensing close to the photosphere at about 2
stellar radii and warm silicates condensing at about 4-5 stellar radii.
We confirm that the number density of aluminum can match that of the
best-fit dust shells near the inner dust shell radius up to the
condensation radii of warm silicates, confirming that Al2O3
grains can be seed particles for the further dust condensation. |
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