Research

Stars Group

Chemical Abundances

Compact Objects

Cool Stars

Galactic Structure

Space Astrometry

Stellar Clusters

Stellar Pulsation

Whole Earth Telescope

Stars Group : Chemical Abundances

 

Harriet Dinerstein, David Lambert, Ivan Ramirez, Chris Sneden


ADS | astro-ph

Harriet Dinerstein  

Professor

website

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

Stars, Chemical Abundances, Interstellar, HII Regions & Planetary Nebulae


ADS | astro-ph

David Lambert  

Professor

website

Research Interests

Stellar atmospheres; chemical composition of stars; chemical evolution of the universe.

Group Areas

Stars, Chemical Abundances


ADS | astro-ph

Ivan Ramirez  

Research Fellow

website

Research Interests

Chemical abundances of planet-host stars; solar twins and solar siblings; Galactic chemical evolution; stellar granulation.

Group Areas

Planetary Systems, Stars, Chemical Abundances


ADS | astro-ph

Chris Sneden  

Professor

website

Research Interests

Chemical composition of stars; stellar evolution; galactic nucleosynthesis.

Group Areas

Stars, 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. astro-ph