Coronae of Zero/Low-Metal Low-Mass Stars
Abstract
Recent theoretical studies suggest the existence of low-mass zero-metal stars in the current universe. In order to study the basic properties of the atmosphere of low-mass first stars, we performed one dimensional magnetohydrodynamical simulations for the heating of coronal loops on low-mass stars with various metallicities. While the simulated loops are heated up to > K by the dissipation of Alfvenic waves originating from the convective motion irrespectively of the metallicity, the coronal properties sensitively depend on the metallicity. Lower-metal stars create hotter and denser coronae because the radiative cooling is suppressed. The zero-metal star gives more than ten times higher coronal density than the solar-metallicity counterpart, and as a result, the UV and X-ray fluxes from the loop are (1-5) times higher than those of the solar metallicity star. We also discuss the dependence of the coronal properties on the length of the simulated coronal loops
Keywords
Cite
@article{arxiv.1903.10148,
title = {Coronae of Zero/Low-Metal Low-Mass Stars},
author = {Haruka Washinoue and Takeru K. Suzuki},
journal= {arXiv preprint arXiv:1903.10148},
year = {2020}
}
Comments
11 pages, 12 figures