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A Spectroscopic Study of Barium Stars

Published online by Cambridge University Press:  01 April 2008

G. Q. Liu ,
Y. C. Liang  and
L. Deng
G. Q. Liu
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, P. R. China email: lgq@bao.ac.cn, ycliang@bao.ac.cn Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China
Y. C. Liang
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, P. R. China email: lgq@bao.ac.cn, ycliang@bao.ac.cn
L. Deng
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, P. R. China email: lgq@bao.ac.cn, ycliang@bao.ac.cn
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Abstract

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We present an analysis of eight barium stars, providing their atmospheric parameters (Teff, log g, [Fe/H], ξt) and chemical abundances, based on the high signal-to-noise ratio and high resolution Echelle spectra. The s-process elements Y, Zr, Ba, La, Eu show obvious overabundance relative to the Sun. And Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Ni show comparable abundances to the Solar ones. The results of theoretical model of wind accretion for binary systems can explain the observed abundance patterns of the neutron capture process elements in these Ba 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.

Keywords

Stars: abundances — Stars: atmospheres — Stars: chemically peculiar — Stars: evolution — binaries: spectroscopic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S252: The Art of Modeling Stars in the 21st Century , April 2008 , pp. 425 - 426
Copyright
Copyright © International Astronomical Union 2008

References

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Liang, Y. C., Zhao, G., Chen, Y. Q., Qiu, H. M., & Zhang, B., 2003, A&A, 397, 257Google Scholar
Liu, G. Q., Liang, Y. C., Deng, L., 2008, ChJAA, be acceptedGoogle Scholar