Sökning: L773:0004 637X OR L773:1538 4357
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Fluorine Abundances...
Fluorine Abundances in the Galactic Disk
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- Guerco, Rafael (författare)
- Observatório Nacional, Saõ Cristóvaõ, Rio de Janeiro, Brazil,National Observatory Brazil
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- Cunha, Katia (författare)
- Observatório Nacional, Saõ Cristóvaõ, Rio de Janeiro, Brazil; University of Arizona, Tucson, 85719, AZ, United States,National Observatory Brazil
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- Smith, Verne V. (författare)
- National Optical Astronomy Observatories, Tucson, 85719, AZ, United States,National Optical Astronomy Observatory
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- Hayes, Christian R. (författare)
- University of Virginia, Charlottesville, 22904, VA, United States
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- Abia, Carlos (författare)
- Depto. Fisica Teorica y del Cosmos, Universidad de Granada, Granada, E-18071, Spain,University of Granada
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- Lambert, David L. (författare)
- W. J. McDonald Observatory and Department of Astronomy, University of Texas at Austin, Austin, 78712, TX, United States
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- Jönsson, Henrik (författare)
- Malmö University,Lund University,Lunds universitet,Malmö universitet,Institutionen för materialvetenskap och tillämpad matematik (MTM),Lund Observatory, Department of Astronomy and Theoretical Physics, Lund University, Box 43, Lund, SE-22100, Sweden,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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- Ryde, Nils (författare)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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(creator_code:org_t)
- 2019-11-08
- 2019
- Engelska.
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Ingår i: Astrophysical Journal. - : Institute of Physics Publishing (IOPP). - 0004-637X .- 1538-4357. ; 885:2
- Relaterad länk:
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http://arxiv.org/pdf...
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http://dx.doi.org/10...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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https://lup.lub.lu.s...
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Abstract
Ämnesord
Stäng
- The chemical evolution of fluorine is investigated in a sample of Milky Way red giant stars that span a significant range in metallicity from [Fe/H] ? ?1.3 to 0.0 dex. Fluorine abundances are derived from vibration-rotation lines of HF in high-resolution infrared spectra near 2.335 ?m. The red giants are members of the thin and thick disk/halo, with two stars being likely members of the outer disk Monoceros overdensity. At lower metallicities, with [Fe/H] < ?0.4 to ?0.5, the abundance of F varies as a primary element with respect to the Fe abundance, with a constant subsolar value of [F/Fe] ? ?0.3 to ?0.4 dex. At larger metallicities, however, [F/Fe] increases rapidly with [Fe/H] and displays a near-secondary behavior with respect to Fe. Comparisons with various models of chemical evolution suggest that in the low-metallicity regime (dominated here by thick-disk stars), a primary evolution of F-19 with Fe, with a subsolar [F/Fe] value that roughly matches the observed plateau, can be reproduced by a model incorporating neutrino nucleosynthesis in the aftermath of the core collapse in Type II supernovae. A primary behavior for [F/Fe] at low metallicity is also observed for a model including rapidly rotating low-metallicity massive stars, but this overproduces [F/Fe] at low metallicity. The thick-disk red giants in our sample span a large range of galactocentric distance (R-g ? 6?13.7 kpc) yet display a roughly constant value of [F/Fe], indicating a very flat gradient (with a slope of 0.02 0.03 dex kpc(?1)) of this elemental ratio over a significant portion of the Galaxy having ?Z? 300 pc away from the Galaxy midplane.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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