EAS Publications Series
Volume 45, 2010GAIA: At the Frontiers of Astrometry
|Page(s)||261 - 266|
|Published online||15 February 2011|
C. Turon, F. Meynadier and F. Arenou (eds)
EAS Publications Series, 45 (2010) 261-266
Limits in astrometric accuracy induced by surface brightness asymmetries
Institut d’Astronomie et d’Astrophysique, Université Libre de
CP. 226, Boulevard du Triomphe,
Surface brightness asymmetries (SBA) are a very common feature of stars and result in a difference between the projected barycentre and photocentre. The evolution of those surface features makes this difference time-dependent. In some cases, e.g. for supergiant stars, the displacement can be a non-negligible fraction of the star radius. We investigate the impact of SBA on the Gaia-based astrometric solution and on the data processing flow.
© EAS, EDP Sciences 2011
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