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| Paper: |
Interferometric Constraints on Surface Brightness Asymmetries
in Long-Period Variable Stars: A Threat to Accurate Gaia Parallaxes |
| Volume: |
445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants |
| Page: |
171 |
| Authors: |
Sacuto, S.; Jorissen, A.; Cruzalèbes, P.; Pasquato, E.; Chiavassa, A.; Spang, A.; Rabbia, Y.; Chesneau, O. |
| Abstract: |
A monitoring of surface brightness asymmetries in evolved giants and
supergiants is necessary to estimate the threat that they represent to
accurate Gaia parallaxes. Closure-phase measurements obtained with
AMBER/VISA in a 3-telescope configuration are fitted by a simple
model to constrain the photocenter displacement. The results for the
C-type star TX Psc show a large deviation of the photocenter
displacement that could bias the Gaia parallax. |
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