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Limits in astrometric accuracy induced by surface brightness asymmetries

Published online by Cambridge University Press:  15 February 2011

C. Turon ,
F. Meynadier ,
F. Arenou ,
E. Pasquato ,
A. Jorissen  and
D. Pourbaix
E. Pasquato
Affiliation:
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, CP. 226, Boulevard du Triomphe, 1050 Bruxelles, Belgium
A. Jorissen
Affiliation:
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, CP. 226, Boulevard du Triomphe, 1050 Bruxelles, Belgium
D. Pourbaix
Affiliation:
Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, CP. 226, Boulevard du Triomphe, 1050 Bruxelles, Belgium
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Abstract

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.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 45: GAIA: At the Frontiers of Astrometry , 2010 , pp. 261 - 266
Copyright
© EAS, EDP Sciences 2011

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References

Références

Busher, D.F., Baldwin, J.E., Warner, P.J., & Haniff, C.A., 1990, MNRAS, 245, 7P
Chiavassa, A., Plez, B., Josselin, E., & Freytag, B., 2009, A&A, 506, 1351
Freytag, B., Steffen, M., & Dorch, B., 2002, Astron. Nachr., 323, 213 3.0.CO;2-H>CrossRef
Freytag, B., & Höfner, S., 2008, A&A, 483, 571
Haubois, X., Perrin, G., Lacour, S., et al., 2009, A&A, 508, 923
Isasi, Y., Figueras, F., Luri, X., & Robin, A., 2010, in “Highlights of Spanish Astrophysiscs V”, ed. J.M. Diego, L.J. Goicoechea, J.I. González-Serrano & J. Gorgas (Berlin: Springer Verlag), 415
Lindegren, L., Babusiaux, C., Bailer-Jones, C., et al., 2008, in IAU Symposium, 248, “A Giant Step: from Mill- to Micro-arcsecond Astrometry”, ed. W.J. Jin, I. Platais & M.A.C. Perryman (Cambridge: Cambridge University Press), 217
Ludwig, H.-G., A&A, 445, 661
Perryman, M.A.C., de Boer, K.S., Gilmore, G., et al., 2001, A&A, 369, 339
Pourbaix, D., & Jorissen, A., 2000, A&AS, 145, 161
Robin, A.C., Reylé, C., Derrière, S., & Picaud, S., 2004, A&A, 416, 157
Stuart, A., & Ord, J.K., 1994, in “Kendall’s advanced theory of statistics. Vol 1: Distribution theory”ed. Stuart, A. & Ord, J.K.
Tatebe, K., Chandler, A.A., Wishnow, E.H., Hale, D.D.S., & Townes, C.H., 2007, ApJ, 670, L21 CrossRef
Tuthill, P.G., Haniff, C.A., & Baldwin, J.E., 1997, MNRAS, 285, 529 CrossRef
Wilson, R.W., Baldwin, J.E., Busher, D.F., & Warner, P.J., 1992, MNRAS, 257, 369 CrossRef
Young, J.S., Baldwin, J.E., Boysen, R.C., et al., 2000, MNRAS, 315, 635 CrossRef