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| Paper: |
Stellar Rotation and Precise Radial Velocities |
| Volume: |
185, Precise Stellar Radial Velocities, IAU Colloquium 170 |
| Page: |
243 |
| Authors: |
Gray, D. F. |
| Abstract: |
Two aspects will be considered. First, I will view the spectroscopic measurement of rotation rates as a differential precision radial velocity: how do we get rotation rates; what are the uncertainties stemming from differential rotation, time variable profiles caused by spots, uncertain limb darkening, and the presence of macroturbulence? What do we even mean by the rotation rate when there is differential rotation? Second, I will discuss the effects of rotation on specifying the precise position of spectral lines, i.e., the classical radial velocity of a star. I will present some thoughts on the effects of having our sharp markers of the Doppler effect degraded by rotation, the meaning of line position when the Doppler effects of rotation and convection interact, and the altered shapes of composite spectrum features with increased rotational smearing. |
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