Limits in astrometric accuracy induced by surface brightness asymmetries

Details Limits in astrometric accuracy induced by surface brightness asymmetries Limits in astrometric accuracy induced by surface brightness asymmetries

Feb 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011eas....45..261p&link_type=abstract

EAS Publications Series, Volume 45, 2011, pp.261-266

Astronomy and Astrophysics

Astronomy

Scientific paper

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.

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