Stars Group : Chemical Abundances
Swedish Solar Telescope/G. Scharmer
Granulation across the HR diagram
We have obtained ultra-high quality spectra (R=180,000; S/N>300)
with unprecedented wavelength coverage (4400 to 7400 A) for a number of stars covering most of the HR diagram in order to test the
predictions of models of stellar surface convection. Line bisectors and core wavelength shifts are both measured and modeled, allowing
us to validate and/or reveal the limitations of state-of-the-art hydrodynamic model atmospheres of different stellar parameters.
We show the status of our project and preliminary results.