Abundance Analysis of Barium Stars

Abstract

We obtain the chemical abundances of six barium stars and two CH subgiant stars based on the high signal-to-noise ratio and high resolution Echelle spectra. The neutron capture process elements Y, Zr, Ba, La, Eu show obvious overabundance relative to the Sun, for example, their [Ba/Fe] values are from 0.45 to 1.27. Other elements, including Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Ni, show comparable abundances to the Solar ones, and their [Fe/H] cover a range from $-$0.40 to 0.21, which means they belong to Galactic disk. The predicts of the theoretical model of wind accretion for binary systems can explain the observed abundance patterns of the neutron capture process elements in these stars, which means that their overabundant heavy-elements could be caused by accreting the ejecta of AGB stars, the progenitors of the present white dwarf companions in the binary systems.

24 pages, 6 figures, accepted for publication in ChJAA

References in corpus (5)

• Chemical composition of 90 F and G disk dwarfs
• The Y^2 Stellar Evolutionary Tracks
• A CORAVEL radial-velocity monitoring of giant Ba and S stars: spectroscopic orbits and intrinsic variations
• Abundance analysis of barium and mild barium stars
• Chemical compositions of four barium stars

Cited by in corpus (7)

• The s Process: Nuclear Physics, Stellar Models, Observations
• Evolution, nucleosynthesis and yields of low mass AGB stars at different metallicities (II): the FRUITY database
• Chemical abundances and kinematics of barium stars
• Constraints of the physics of low-mass AGB stars from CH and CEMP stars
• Non-LTE Sodium Abundance in Galactic Thick- and Thin-Disk Red Giants
• Chemical abundance analysis of 19 barium stars
• Modeling blue stragglers in young clusters