Helioseismic determination of the solar metal mass fractionстатья
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Дата последнего поиска статьи во внешних источниках: 20 февраля 2024 г.
Аннотация:Context. The metal mass fraction of the Sun Z is a key constraint in solar modelling, but its value is still under debate. The standardsolar chemical composition of the late 2000s have the ratio of metals to hydrogen Z/X = 0.0181, with a small increase to 0.0187in 2021, as inferred from 3D non-LTE spectroscopy. However, more recent work on a horizontally and temporally averaged <3D>model claim Z/X = 0.0225, consistent with the high values of twenty-five years ago based on 1D LTE spectroscopy.Aims. We aim to determine a precise and robust value of the solar metal mass fraction from helioseismic inversions, thus providingindependent constraints from spectroscopic methods.Methods. We devise a detailed seismic reconstruction technique of the solar envelope, combining multiple inversions and equationsof state to accurately and precisely determine the metal mass fraction value.Results. We show that a low value of the solar metal mass fraction corresponding to Z/X = 0.0187 is favoured by helioseismicconstraints and that a higher metal mass fraction corresponding to Z/X = 0.0225 are strongly rejected by helioseismic data.Conclusions. We conclude that direct measurement of the metal mass fraction in the solar envelope favours a low metallicity, in linewith the 3D non-LTE spectroscopic determination of 2021. A high metal mass fraction as measured using a <3D> model in 2022 isdisfavoured by helioseismology for all modern equations of state used to model the solar convective envelope.