Stars Group : Chemical Abundances
 | Professor Research Interests Planetary nebulae; abundances in gaseous nebulae; infrared, optical, and ultraviolet spectroscopy of emission lines; extragalactic H II regions and star formation in disk galaxies; classical novae. Group Areas | |
 | Director McDonald Observatory Research Interests Stellar atmospheres; chemical composition of stars; chemical evolution of the universe. | |
 | Professor Research Interests Chemical composition of stars; stellar evolution; galactic nucleosynthesis. | |
 | Sagan Postdoctoral Fellow Research Interests Chemical abundances of planet-host stars; solar twin stars; Galactic chemical evolution; stellar granulation. | |
 | Graduate Student | |
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. astro-ph