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| Paper: |
The Wind Acceleration Region of Betelgeuse: Resolved at
Centimeter Wavelengths |
| Volume: |
497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time |
| Page: |
553 |
| Authors: |
O'Gorman, E.; Harper, G. M.; Brown, A. |
| Abstract: |
We present multi-epoch spatially resolved radio continuum observations
of Betelgeuse (α Ori) at various combinations of wavelengths
between 0.7 and 6.1 cm. We used the Very Large Array in the
A configuration with the Pie Town antenna to spatially resolve its
atmosphere at 0.7, 1.3, 2.0, and 6.1 cm at all epochs. Our findings
are similar to those of Lim et al. (1998) in that Betelgeuse's
opaque atmosphere extends from 2 to 6 R* between 0.7 and
6.1 cm with temperatures decreasing from ∼3000 to 1800 K,
respectively. We find no evidence of radio hotspots at any epochs
even though we have sufficient spatial resolution and sensitivity at
0.7 and 1.3 cm to detect the hotspots recently reported with
e-MERLIN at 5.2 cm. |
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