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| Paper: |
High-Spatial- and High-Spectral-Resolution Observations of
the Inhomogeneous Outer Atmosphere of the M Giant BK Vir |
| Volume: |
445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants |
| Page: |
113 |
| Authors: |
Ohnaka, K. |
| Abstract: |
We present high-spatial- and high-spectral-resolution observations
of the normal M-type AGB star BK Vir using the AMBER
instrument at the Very Large Telescope Interferometer.
AMBER's high spatial resolution (9.5 mas) and high spectral
resolution (λ/Δλ = 12000) enable us to probe
the inhomogeneous structure of the atmosphere using the CO
first-overtone lines near 2.3μm.
The AMBER data in the CO lines reveal the presence of
inhomogeneous CO layers, which are much more extended than predicted
by hydrostatic photospheric models. These AMBER observations
are the first to spatially resolve the “warm molecular envelope”
toward AGB stars in individual CO lines. |
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