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• W2106196137 abstract "Context. The content of Galactic HII regions is very close to that of the Sun and the solar system, and only slightly higher than the primordial abundance as predicted by the standard Big Bang nucleosynthesis. However, the classical theory of stellar evolution predicts a high production of by low-mass stars, implying a strong increase of with time in the Galaxy. This is the well-known 3He problem. Aims. We study the effects of thermohaline and rotation-induced mixings on the production and destruction of over the lifetime of low- and intermediate-mass stars at various metallicities. Methods. We compute stellar evolutionary models in the mass range 1 to 6Modot for four metallicities, taking into account thermohaline instability and rotation-induced mixing. For the thermohaline diffusivity we use the prescription based on the linear stability analysis, which reproduces Red Giant Branch (RGB) abundance patterns at all metallicities. Rotation-induced mixing is treated taking into account meridional circulation and shear turbulence. We discuss the effects of these processes on internal and surface abundances of and on the net yields. Results. Over the whole mass and metallicity range investigated, rotation-induced mixing lowers the production, as well as the upper mass limit at which stars destroy 3He. For low-mass stars, thermohaline mixing occuring beyond the RGB bump is the dominant process in strongly reducing the net yield compared to standard computations. Yet these stars remain net producers. Conclusions. Overall, the net yields are strongly reduced compared to the standard framework predictions." @default.
• W2106196137 created "2016-06-24" @default.
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• W2106196137 date "2011-09-26" @default.
• W2106196137 modified "2023-09-27" @default.
• W2106196137 title "Thermohaline instability and rotation-induced mixing II- Yields of 3He for low- and intermediate-mass stars" @default.
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