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Chemical Signatures of the First Supernovae in the Sculptor Dwarf Spheroidal Galaxy
Joshua D. Simon, Heather R. Jacobson, Anna Frebel +3
We present a homogeneous chemical abundance analysis of five of the most metal-poor stars in the Sculptor dwarf spheroidal galaxy. We analyze new and archival high resolution spect…
The Chemical Evolution of Phosphorus
Heather R. Jacobson, Thanawuth Thanathibodee, Anna Frebel +3
Phosphorus is one of the few remaining light elements for which little is known about its nucleosynthetic origin and chemical evolution, given the lack of optical absorption lines…
Detection of Neutral Phosphorus in the Near Ultraviolet Spectra of Late-Type Stars
Ian U. Roederer, Heather R. Jacobson, Thanawuth Thanathibodee +2
We report the detection of several absorption lines of neutral phosphorus (P, Z=15) in archival near ultraviolet spectra obtained with the Space Telescope Imaging Spectrograph on b…
Carbon-Enhanced Metal-Poor Star Frequencies in the Galaxy: Corrections for the Effect of Evolutionary Status on Carbon Abundances
Vinicius M. Placco, Anna Frebel, Timothy C. Beers +1
We revisit the observed frequencies of Carbon-Enhanced Metal-Poor (CEMP) stars as a function of the metallicity in the Galaxy, using data from the literature with available high-re…
Reconstructing the cosmic evolution of the chemical elements
Anna Frebel
The chemical elements are created in nuclear fusion processes in the hot and dense cores of stars. The energy generated through nucleosynthesis allows stars to shine for billions o…
New Detections of Arsenic, Selenium, and Other Heavy Elements in Two Metal-Poor Stars
Ian U. Roederer, Hendrik Schatz, James E. Lawler +6
We use the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope to obtain new high-quality spectra covering the 1900 to 2360 Angstrom wavelength range for two m…