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نویسندگان مقالات پربازدید :
اخترفیزیک و علوم فضایی 2013
جزئیات رویداد
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  • the study of s-process nucleosynthesis based on barium stars, cemp-s and cemp-r/s stars

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 958
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    • شماره تماس دبیرخانه رویداد: -
     in order to get a broader view of the s-process nucleosynthesis we study the abundance distribution of heavy elements of 35 barium stars and 24 cemp-stars, including nine cemp-s stars and 15 cemp-r/s stars. the similar distribution of [pb/hs] between cemp-s and cemp-r/s stars indicate that the s-process material of both cemp-s and cemp-r/s stars should have a uniform origin, i.e. mass transfer from their predominant agb companions. for the cemp-r/s stars, we found that the r-process should provide similar proportional contributes to the second s-peak and the third s-peak elements, and also be responsible for the higher overabundance of heavy elements than those in cemp-s stars. which hints that the r-process origin of cemp-r/s stars should be closely linked to the main r-process. the fact that some small r values exist for both barium and cemp-s stars, implies that the single exposure event of the s-process nucleosynthesis should be general in a wide metallicity range of our galaxy. based on the relation between c r and c s, we suggest that the origin of r-elements for cemp-r/s stars have more sources. a common scenario is that the formation of the binary system was triggered by only one or a few supernova. in addition, accretion-induced collapse(aic) or sn 1.5 should be the supplementary scenario, especially for these whose pre-agb companion with higher mass and smaller orbit radius, which support the higher values of both c rand c s.

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