Large-scale magnetic fields and anomalies of chemical composition of stellar coronae
arXiv:1709.00855 · doi:10.1016/j.jastp.2018.03.016
Abstract
We present evidences that anomalies in abundance of the chemical minor elements with the low first ionization potential (FIP) in the low corona of the late-type stars can be related with topology of the large-scale magnetic field. The solar observations show the increased abundances of the low FIP elements in compare to the abundances of the high FIP elements above the active regions and in the closed magnetic configurations of the low corona. Observational data of Ulysses and the Stanford Solar Observatory show high correlations between FIP effect of the solar wind, amount of the unsigned open magnetic flux, and the ratio between strength of the large-scale toroidal and poloidal magnetic field on the surface. The solar-type stars show the increase abundance of the low FIP elements relative to elements with the high FIP with the decrease of the large-scale poloidal magnetic field (and increase the toroidal component of the magnetic field). The branch of the fully convective stars demonstrates inversion of the FIP-effect. This inversion can be result from strong coronal activity, which is followed to the strong poloidal magnetic on these stars.
24 pages, 5 figures, accepted for publication on March 21, 2018 in Journal of Atmospheric and Solar-Terrestrial Physics (JASTP)
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