Chemical Evolution of Ytterbium in the Galactic Disk
M. Montelius, R. Forsberg, N. Ryde, H. J\"onsson, M. Af\c{s}ar, A., Johanssen, K. F. Kaplan, H. Kim, G. Mace, C. Sneden, B. Thorsbro

TL;DR
This study measures ytterbium abundances in Galactic disk stars using infrared spectra, revealing its s- and r-process contributions and supporting theoretical models of galactic chemical evolution.
Contribution
It introduces a reliable method for determining Yb abundances in cool giants via infrared spectra, expanding the sample for galactic chemical evolution studies.
Findings
Yb abundance trend closely follows Eu, indicating r-process contribution.
Yb shows clear s-process enrichment in s-rich stars.
Results support a 40/60 s-/r-process origin for Yb.
Abstract
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 from the infrared H-band only the s-process dominated element cerium has been accurately measured for a large sample of disk stars. The more r-process dominated element ytterbium has only been measured in a small subset of stars so far. In this study we aim to measure the ytterbium (Yb) abundance of local disk giants using the Yb II line at =16498\AA. We also compare the resulting abundance trend with Ce and Eu abundances for the same stars to analyse the s- and r-process contributions. We analyse 30 K-giants with high-resolution H-band spectra using spectral synthesis. The very same stars have already been…
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Taxonomy
TopicsAstrophysics and Star Formation Studies · Astro and Planetary Science · Astrophysical Phenomena and Observations
