| Issue |
EAS Publications Series
Volume 45, 2010
GAIA: At the Frontiers of Astrometry
|
|
|---|---|---|
| Page(s) | 261 - 266 | |
| DOI | https://doi.org/10.1051/eas/1045044 | |
| 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
Bruxelles,
CP. 226, Boulevard du Triomphe,
1050
Bruxelles,
Belgium
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