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Chemical evolution ...
Chemical evolution of ytterbium in the Galactic disk
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- Montelius, M. (författare)
- Univ Groningen, Kapteyn Astron Inst, Landleven 12, NL-9747 AD Groningen, Netherlands.;Lund Univ, Dept Astron & Theoret Phys, Lund Observ, Box 43, S-22100 Lund, Sweden.,University of Groningen,Lund University,Ege University,University of Texas at Austin
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- Forsberg, R. (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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- Ryde, N. (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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- Jönsson, H. (författare)
- Malmö University,Malmö universitet,Institutionen för materialvetenskap och tillämpad matematik (MTM),Malmo Univ, Mat Sci & Appl Math, S-20506 Malmo, Sweden.
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- Afsar, M. (författare)
- Ege Univ, Dept Astron & Space Sci, TR-35100 Izmir, Turkey.;Univ Texas Austin, Dept Astron, Austin, TX 78712 USA.;Univ Texas Austin, McDonald Observ, Austin, TX 78712 USA.
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- Johansen, A. (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,University of Copenhagen,Centre for Star and Planet Formation (StarPlan)
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- Kaplan, K. F. (författare)
- NASA, SOFIA Sci Ctr USRA, Ames Res Ctr, Moffett Field, CA 94035 USA.,NASA Ames Research Center
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- Kim, H. (författare)
- Gemini Observ NOIRLab, Casilla 603, La Serena, Chile.,Gemini Observatory
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- Mace, G. (författare)
- Univ Texas Austin, Dept Astron, Austin, TX 78712 USA.;Univ Texas Austin, McDonald Observ, Austin, TX 78712 USA.,University of Texas at Austin
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- Sneden, C. (författare)
- Univ Texas Austin, Dept Astron, Austin, TX 78712 USA.;Univ Texas Austin, McDonald Observ, Austin, TX 78712 USA.,University of Texas at Austin
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- Thorsbro, B. (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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Univ Groningen, Kapteyn Astron Inst, Landleven 12, NL-9747 AD Groningen, Netherlands;Lund Univ, Dept Astron & Theoret Phys, Lund Observ, Box 43, S-22100 Lund, Sweden. University of Groningen (creator_code:org_t)
- 2022-09-21
- 2022
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 665
- Relaterad länk:
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http://dx.doi.org/10... (free)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://lup.lub.lu.s...
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Abstract
Ämnesord
Stäng
- Context. Measuring the abundances of neutron-capture elements in Galactic disk stars is an important part of understanding key stellar and galactic processes. In the optical wavelength regime a number of different neutron-capture elements have been measured; however, only the s-process-dominated element cerium has been accurately measured for a large sample of disk stars from the infrared H band. The more r-process dominated element ytterbium has only been measured in a small subset of stars so far. Aims. In this study we aim to measure the ytterbium (Yb) abundance of local disk giants using the Yb II line at lambda(air) = 16 498 angstrom. We also compare the resulting abundance trend with cerium and europium abundances for the same stars to analyse the s- and r-process contributions. Methods. We analyse 30 K giants with high-resolution H band spectra using spectral synthesis. The very same stars have already been analysed using high-resolution optical spectra via the same method, but it was not possible to determine the abundance of Yb from those spectra due to blending issues for stars with [Fe/H] > -1. In the present analysis, we utilise the stellar parameters determined from the optical analysis. Results. We determined the Yb abundances with an estimated uncertainty for [Yb/Fe] of 0.1 dex. By comparison, we found that the [Yb/Fe] trend closely follows the [Eu/Fe] trend and has clear s-process enrichment in identified s-rich stars. This comparison confirms both that the validity of the Yb abundances is ensured and that the theoretical prediction that the s-/r-process contribution to the origin of Yb of roughly 40/60 is supported. Conclusions. These results show that, with a careful and detailed analysis of infrared spectra, reliable Yb abundances can be derived for a wider sample of cooler giants in the range -1.1 < [Fe/H] < 0.3. This is promising for further studies of the production of Yb and for the r-process channel, key for galactochemical evolution, in the infrared.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- stars: abundances
- stars: late-type
- Galaxy: abundances
- Galaxy: disk
- Galaxy: evolution
- infrared: stars
- Galaxy: abundances
- Galaxy: disk
- Galaxy: evolution
- Infrared: stars
- Stars: abundances
- Stars: late-type
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Montelius, M.
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Forsberg, R.
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Ryde, N.
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Jönsson, H.
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Afsar, M.
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Johansen, A.
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visa fler...
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Kaplan, K. F.
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Kim, H.
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Mace, G.
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Sneden, C.
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Thorsbro, B.
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visa färre...
- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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Astronomy and As ...
- Av lärosätet
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Malmö universitet
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Lunds universitet