Vanadium Abundance Derivations in 255 Metal-poor Stars
| Autor: | Christopher Sneden, Ian B. Thompson, John J. Cowan, Stephen A. Shectman, Xiaowei Ou, Ian U. Roederer, James E. Lawler |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010504 meteorology & atmospheric sciences
Metallicity FOS: Physical sciences Vanadium chemistry.chemical_element Astrophysics 01 natural sciences law.invention Telescope Observatory law Nucleosynthesis 0103 physical sciences 010303 astronomy & astrophysics Spectrograph Solar and Stellar Astrophysics (astro-ph.SR) 0105 earth and related environmental sciences Physics Sigma Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Stars chemistry Astrophysics - Solar and Stellar Astrophysics 13. Climate action Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) |
| Popis: | We present vanadium (V) abundances for 255 metal-poor stars, derived from high-resolution optical spectra from the Magellan Inamori Kyocera Echelle spectrograph on the Magellan Telescopes at Las Campanas Observatory, the Robert G. Tull Coud\'{e} Spectrograph on the Harlan J. Smith Telescope at McDonald Observatory, and the High Resolution Spectrograph on the Hobby-Eberly Telescope at McDonald Observatory. We use updated V I and V II atomic transition data from recent laboratory studies, and we increase the number of lines examined (from 1 to 4 lines of V I, and from 2 to 7 lines of V II). As a result, we reduce the V abundance uncertainties for most stars by more than 20% and expand the number of stars with V detections from 204 to 255. In the metallicity range $-$4.0 $ Comment: 19 pages, 15 figures, 4 tables, accepted for publication in ApJ |
| Databáze: | OpenAIRE |
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