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Sökning: id:"swepub:oai:DiVA.org:mau-18680" > Fluorine Abundances...

Fluorine Abundances in the Galactic Disk

Guerco, Rafael (författare)
Observatório Nacional, Saõ Cristóvaõ, Rio de Janeiro, Brazil,National Observatory Brazil
Cunha, Katia (författare)
Observatório Nacional, Saõ Cristóvaõ, Rio de Janeiro, Brazil; University of Arizona, Tucson, 85719, AZ, United States,National Observatory Brazil
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
Abia, Carlos (författare)
Depto. Fisica Teorica y del Cosmos, Universidad de Granada, Granada, E-18071, Spain,University of Granada
Lambert, David L. (författare)
W. J. McDonald Observatory and Department of Astronomy, University of Texas at Austin, Austin, 78712, TX, United States
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
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.
Ingår i: Astrophysical Journal. - : Institute of Physics Publishing (IOPP). - 0004-637X .- 1538-4357. ; 885:2
Relaterad länk:
http://arxiv.org/pdf...
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http://dx.doi.org/10...
https://urn.kb.se/re...
https://doi.org/10.3...
https://lup.lub.lu.s...
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  • Tidskriftsartikel (refereegranskat)
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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