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Abstract <p>A comparative analysis of the relative abundances of chemical elements produced in different nucleosynthesis channels in the atmospheres of the metal-rich ([Fe/H] <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(&gt;-1\)</EquationSource> <!--BPhysMGU2570176Gozha-m1--> </InlineEquation>) Galactic-field RR Lyrae variables and in the stars of the Sagittarius dwarf galaxy, as well as in the stars of the Milky Way disk, is presented. In the [Fe/H]–[X/Fe] diagrams, the metal-rich RR Lyraes are located between two groups of comparison stars. We assume that the unusual chemical properties of the metal-rich RR Lyrae variables can be explained by their formation from the Milky Way’s matter with the addition of gas accreted from the Sagittarius dwarf galaxy.</p>

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Is There a Relation between Galactic-Field Metal-Rich RR Lyrae Variables and the Sagittarius Dwarf Galaxy?

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • M. L. Gozha,
  • V. A. Marsakov,
  • V. V. Koval’

摘要

Abstract

A comparative analysis of the relative abundances of chemical elements produced in different nucleosynthesis channels in the atmospheres of the metal-rich ([Fe/H] \(>-1\) ) Galactic-field RR Lyrae variables and in the stars of the Sagittarius dwarf galaxy, as well as in the stars of the Milky Way disk, is presented. In the [Fe/H]–[X/Fe] diagrams, the metal-rich RR Lyraes are located between two groups of comparison stars. We assume that the unusual chemical properties of the metal-rich RR Lyrae variables can be explained by their formation from the Milky Way’s matter with the addition of gas accreted from the Sagittarius dwarf galaxy.