Refine your search�ソスF     
Report No.
 - 

Interpretation of extremely metal-poor stars as candidates of first generation stars

Nishimura, Takanori*; Aikawa, Masayuki*; Iwamoto, Nobuyuki  ; Suda, Takuma*; Fujimoto, Masayuki*; Iben, I. Jr.*

The evolution of extremely metal-poor stars of low- and intermediate-masses is distinct from those of metal-rich stars in that the convection driven by the helium shell flash can extend outward into the hydrogen-rich layer during TP-AGB phase. In the circumstance of [Fe/H]$$<-$$2.5, protons are mixed and converted into neutrons in the convective zone to promote nucleosynthesis through neutron and $$alpha$$-captures. We study the nucleosynthesis in the helium-flash convective zone, induced by this hydrogen mixing. In the dearth of the pristine metals, the neutron-recycling reactions $$^{12}$$C($$n,gamma$$)$$^{13}$$C($$alpha,n$$)$$^{16}$$O and in some cases the subsequent $$^{16}$$O($$n,gamma$$)$$^{17}$$O($$alpha,n$$)$$^{20}$$Ne play and important role and catalyze the syntheses of O through Mg and still heavier elements. Based on these results, we assign the origin of two most iron-deficient stars to the Pop III stars, born out of the primordial gas.

Accesses

:

- Accesses

InCites™

:

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.