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.
@article{arxiv.0908.4571,
title = {Granulation across the HR diagram},
author = {I. Ramirez and C. Allende Prieto and D. L. Lambert and L. Koesterke and M. Asplund},
journal= {arXiv preprint arXiv:0908.4571},
year = {2009}
}
Comments
4 pages, 3 figures; proceedings article for Joint Discussion 10 at the IAU General Assembly, Rio de Janeiro, Brazil, August 2009