Photocentric variability of red supergiant stars and consequences on Gaia measurements

Details Photocentric variability of red supergiant stars and consequences on Gaia measurements Photocentric variability of red supergiant stars and consequences on Gaia measurements

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sf2a.conf..339c&link_type=abstract

SF2A-2010: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics. Eds.: S. Boissier, M. Heydari-

Astronomy and Astrophysics

Astrophysics

1

Supergiants, Astrometry, Parallaxes, Hydrodynamics

Scientific paper

Red supergiant stars are characterized by large convection-related surface structures that cause surface inhomogeneities and shock waves. We explore the impact of granulation on the photocentric motion using 3D simulations of convection with CO5BOLD and post-processing radiative transfer code Optim3D to compute spectra and intensity maps in the Gaia G band [325 -- 1030~nm]. We found that the Gaia parallax for Betelgeuse-like supergiants are characterized by a systematic error of a few percents.

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