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We present a novel technique to determine the absolute inclination of singlestars using multi-wavelength sub-milliarcsecond astrometry. The techniqueexploits the effect of gravity darkening, which causes a wavelength-dependentastrometric displacement parallel to a star's projected rotation axis. We findthis effect is clearly detectable using SIM Lite for various giant stars andrapid rotators, and present detailed models for multiple systems using theREFLUX code. We also explore the multi-wavelength astrometric reflex motioninduced by spots on single stars. We find that it should be possible todetermine spot size, relative temperature, and some positional information forboth giant and nearby main-sequence stars utilizing multi-wavelength SIM Litedata. This data will be extremely useful in stellar and exoplanet astrophysics,as well as supporting the primary SIM Lite mission through propermulti-wavelength calibration of the giant star astrometric reference frame, andreduction of noise introduced by starspots when searching for extrasolarplanets.

astrophysical journal/the astrophysical journal

Modeling Multi-Wavelength Stellar Astrometry. II. Determining Absolute  Inclinations, Gravity Darkening Coefficients, and Spot Parameters of Single  Stars with SIM Lite