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28 March 2024
 
  » arxiv » astro-ph/0011118

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The heavy-element abundances of AGB stars and the angular momentum conservation model of wind accretion for barium stars
Y. C. Liang ; G. Zhao ; B. Zhang ;
Date 6 Nov 2000
Subject astro-ph
Affiliation1,3), G. Zhao (1,3), B. Zhang (2,4) ( Beijing Astro. Obs., Hebei Normal Univ. National Astro. Obs. BAC
AbstractAdpoting new s-process nucleosynthesis scenario and branch s-process path, we calculate the heavy-element abundances and C/O ratio of solar metallicity 3M_sun TP-AGB stars. The evolutionary sequence from M to S to C stars of AGB stars is explained naturally by the calculated results. Then combining the angular momentum conservation model of wind accretion with the heavy-element abundances on the surface of TP-AGB stars, we calculate the heavy-element overabundances of barium stars via successive pulsed accreting and mixing. Our results support that the barium stars with longer orbital period, P>1600 days, form through wind accretion scenario.
Source arXiv, astro-ph/0011118
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