HD 11397 and HD 14282 - Two new barium stars?

Abstract

We have performed a detailed abundance analysis of the content of s-process elements of two dwarf stars with suspected overabundace of those elements. Such stars belong to a special kinematic sample of the solar neighborhood, with peculiar kinematics and different chemical abundances when compared to "normal" disk stars. We aim to define if those stars can be identified as barium stars, based on their s-process elements abundances, and their classification, i.e., if they share their chemical profile with strong or mild barium stars. We also intend to shed light on the possible origins of the different kinds of barium stars. Spectra have been taken by using the FEROS spectrograph at the 1.52m telescope of ESO, La Silla. Abundances have been derived for 18 elements, by matching the synthetic profile with the observed spectrum. We have found that HD 11397 shows a mild enhancement for most of the s-process elements as well as for some r-process elements. This star seems to share its abundance profile with the mild Ba-stars. Although showing some slight chemical anomalies for Y, Sr, Mo, and Pb, HD 14282 depicts a chemical pattern similar to the normal stars with slight s-process enhancements.

arXiv comment11 pages, 5 figures

References in corpus (12)

• Neutron capture in low mass Asymptotic Giant Branch stars: cross sections and abundance signatures
• Neutron-Capture Elements in the Early Galaxy: Insights from a Large Sample of Metal-Poor Giants
• Nucleosynthesis and mixing on the Asymptotic Giant Branch. III. Predicted and observed s-process abundances
• Rubidium in Metal-Deficient Disk and Halo Stars
• Detection of Lead in the Carbon-Rich, Very Metal-Poor Star LP625-44: A Strong Constraint on s-Process Nucleosynthesis at Low Metallicity
• Analysis of 26 Barium Stars I. Abundances
• Abundance analysis of barium and mild barium stars
• Detailed Analysis of Nearby Bulgelike Dwarf Stars III. Alpha and Heavy-element abundances
• Detailed Analysis of Nearby Bulge-like Dwarf Stars I. Stellar Parameters, Kinematics and Oxygen Abundances
• Chemical compositions of four barium stars
• The chemical composition of a mild barium star HD202109
• Binary life after the AGB - towards a unified picture

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