The Ca II H and K lines are among the few features available to infer the metallicity of extremely metal-poor stars from medium-resolution spectroscopy...
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PublicationAccurate Metallicities for Very Metal-poor Stars from the Ca II Infrared Triplet
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NewsAn old problem about the measurement of the chemical composition of the universe has been resolved
Research carried out by a scientific team from the University of Heidelberg (UH), the Instituto de Astrofísica de Canarias (IAC) and the National Autonomous...
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NewsAstronomers detect large amounts of oxygen in the atmosphere of a primitive star
Scientists from the Instituto de Astrofísica de Canarias (IAC), in collaboration with the University of Cambridge and the University of California San Diego...
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PublicationBACCHUS Analysis of Weak Lines in APOGEE Spectra (BAWLAS)
Elements with weak and blended spectral features in stellar spectra are challenging to measure and require specialized analysis methods to precisely measure...
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PublicationEvolution of the Mass-Metallicity Relation from Redshift z ≈ 8 to the Local Universe
A tight positive correlation between the stellar mass and the gas-phase metallicity of galaxies has been observed at low redshifts. The redshift evolution of...
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PublicationOpen Cluster Chemical Homogeneity throughout the Milky Way
The chemical homogeneity of surviving stellar clusters contains important clues about interstellar medium (ISM) mixing efficiency, star formation, and the...
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PublicationOrbital Torus Imaging: Using Element Abundances to Map Orbits and Mass in the Milky Way
Many approaches to galaxy dynamics assume that the gravitational potential is simple and the distribution function is time invariant. Under these assumptions...
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PublicationPhotoionized Herbig-Haro Objects in the Orion Nebula through Deep High Spectral Resolution Spectroscopy. II. HH 204
We analyze the physical conditions, chemical composition, and other properties of the photoionized Herbig-Haro (HH) object HH 204 through Very Large Telescope...
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PublicationPhysical Parameters of SDSS Stars, the Nature of the SDSS `Ring around the Galaxy', and the SEGUE Project
Although the Sloan Digital Sky Survey (SDSS) was primarily envisioned as a tool for understanding the nature of the `high redshift' universe, significant...