Accounting for Convective Blue-Shifts in the Determination of Absolute Stellar Radial Velocities

Details Accounting for Convective Blue-Shifts in the Determination of Absolute Stellar Radial Velocities Accounting for Convective Blue-Shifts in the Determination of Absolute Stellar Radial Velocities

2009-09-02

arxiv.org/abs/0909.0470v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

To appear in the proceedings of the Joint Discussion 10, IAU General Assembly, Rio de Janeiro, August 10-11, 2009

Scientific paper

For late-type non-active stars, gravitational redshifts and convective blueshifts are the main source of biases in the determination of radial velocities. If ignored, these effects can introduce systematic errors of the order of ~ 0.5 km/s. We demonstrate that three-dimensional hydrodynamical simulations of solar surface convection can be used to predict the convective blue-shifts of weak spectral lines in solar-like stars to ~ 0.070 km/s. Using accurate trigonometric parallaxes and stellar evolution models, the gravitational redshifts can be constrained with a similar uncertainty, leading to absolute radial velocities accurate to better than ~ 0.1 km/s.

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