https://doi.org/10.1051/epjconf/202226011016
Enhancement of Lithium in Red Clump Stars by Neutrino Magnetic Moments
1 Research Institute of Stellar Explosive Phenomena, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka-shi, Fukuoka 814-0180, Japan
2 Division of Science, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
3 International Research Center for Big-Bang Cosmology and Element Genesis, and School of Physics, Beihang University, 37 Xueyuan Road, Haidian-qu, Beijing 100083, China
4 Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706 USA
5 Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033 Japan
6 Department of Physics, Western Michigan University, Kalamazoo, MI 49008 USA
* e-mail: kanji.mori@fukuoka-u.ac.jp
Published online: 24 February 2022
A recent spectroscopic survey has shown that the lithium abundances in low-mass red-clump stars are higher than theoretical prediction. Motivated by their finding, we implemented effects of additional energy losses induced by neutrino magnetic moments on stellar evolution models. It is found that the lithium abundances in red giants increase because the finite magnetic moments of neutrinos enhance the efficiency of deep mixing and 7Be is conveyed from the hydrogen burning shell to the convective envelope. The results motivate further studies on the effects of non-standard energy losses on the surface compositions of low-mass red giants and red-clump stars.
© The Authors, published by EDP Sciences, 2022
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
