The CARMENES search for exoplanets around M dwarfs: Magnesium and silicon abundances of K7-M5.5 stars
arxiv(2024)
摘要
We present the abundances of magnesium (Mg) and silicon (Si) for 314 dwarf
stars with spectral types in the interval K7.0-M5.5 (Teff range 4200-3050 K)
observed with the CARMENES high-resolution spectrograph at the 3.5 m telescope
at the Calar Alto Observatory. Our analysis employs the BT-Settl model
atmospheres, the radiative transfer code Turbospectrum, and a state-of-the-art
selection of atomic and molecular data. These Mg and Si abundances are critical
for understanding both the chemical evolution and assembly of the Milky Way and
the formation and composition of rocky planets. Our chemical abundances show a
line-to-line scatter at the level of 0.1 dex for all studied spectral types.
The typical error bar of our chemical abundance measurements is +- 0.11 dex
(Mg) and +- 0.16 dex (Si) for all spectral types based on the comparison of the
results obtained for stellar components of multiple systems. The derived
abundances are consistent with the galactic evolution trends and observed
chemical abundance distribution of earlier FGK-type stars in the solar
neighbourhood. Besides, our analysis provides compatible abundances for stars
in multiple systems. In addition, we studied the abundances of different
galactic stellar populations. In this paper, we also explore the relation of
the Mg and Si abundances of stars with and without known planets.
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