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Chemical Abundance Analysis of Cetus II

ORAL

Abstract

Ultra-faint dwarf galaxies are low mass and luminosity galaxies that contain very metal poor stars. Abundance analysis of these stars provide insight to the early universe and galaxy evolution. We performed a chemical abundance analysis on the ultra-faint dwarf galaxy Cetus II. We derived abundances of one star in Cetus II from a high-resolution spectrum. The star has a low Magnesium abundance of [Mg/Fe]=0.07, while the calcium abundance of [Ca/Fe]=0.31 reflects the expected alpha-enhancement seen in metal-poor stars. A low Magnesium abundance with normal abundances for Calcium and other alpha elements signals that these elements were created by a star with a mass M $\lesssim$ 20 M$_\odot$.

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Authors

  • Kaitlin Webber

    Texas A&M University

  • Mohammad Barzegar

    Vanderbilt University, Rowan University, California State University (retired), University of North Texas, Michigan Technological University, Texas A&M University, University of Texas at El Paso, Cornell University, Rice University, Cyclotron Institute, Texas A\&M University, College Station, TX 77843, 2020 National PhysTEC Teacher of the Year, Fresno State Physics Department, University of Texas at Arlington, Institute for Quantum Science and Engineering, Department of Physics and Astronomy, Texas A & M University, Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, University of Miami, Texas A&M University–Corpus Christi

  • Mohammad Barzegar

    Vanderbilt University, Rowan University, California State University (retired), University of North Texas, Michigan Technological University, Texas A&M University, University of Texas at El Paso, Cornell University, Rice University, Cyclotron Institute, Texas A\&M University, College Station, TX 77843, 2020 National PhysTEC Teacher of the Year, Fresno State Physics Department, University of Texas at Arlington, Institute for Quantum Science and Engineering, Department of Physics and Astronomy, Texas A & M University, Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, University of Miami, Texas A&M University–Corpus Christi