About Metallicity Variations in the Local Galactic Interstellar Medium

  1. Esteban, C.
  2. Méndez-Delgado, J. E.
  3. García-Rojas, J.
  4. Arellano-Córdova, K. Z.
  1. 1 Universidad de La Laguna
    info

    Universidad de La Laguna

    San Cristobal de La Laguna, España

    ROR https://ror.org/01r9z8p25

Revista:
The Astrophysical Journal

ISSN: 0004-637X,  1538-4357

Año de publicación: 2022

Volumen: 931

Número: 2

Páginas: 92

Tipo: Artículo

DOI: 10.3847/1538-4357/AC6B38 GOOGLE SCHOLAR lock_openAcceso abierto editor

Otras publicaciones en: The Astrophysical Journal

Resumen

In this paper we discuss and confront recent results on metallicity variations in the local interstellar medium, obtained from observations of H ii regions and neutral clouds of the Galactic thin disk, and compare them with recent high-quality metallicity determinations of other tracers of the chemical composition of the interstellar medium as B-type stars, classical Cepheids, and young clusters. We find that the metallicity variations obtained for these last kinds of objects are consistent with each other and with that obtained for H ii regions but significantly smaller than those obtained for neutral clouds. We also discuss the presence of a large population of low-metallicity clouds as the possible origin for large metallicity variations in the local Galactic thin disk. We find that such a hypothesis does not seem compatible with: (a) what is predicted by theoretical studies of gas mixing in galactic disks, and (b) the models and observations on the metallicity of high-velocity clouds and their evolution as they mix with the surrounding medium in their fall onto the Galactic plane. We conclude that most of the evidence favors that the chemical composition of the interstellar medium in the solar neighborhood is highly homogeneous.

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