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Mn abundances in the stars of the Galactic disc with metallicities -1.0 < [Fe/H] < 0.3

Mishenina, Tamara; Gorbaneva, Tatyana Ivanovna; Pignatari, M.; Thielemann, Friedrich-Karl; Korotin, Sergey

Authors

Tamara Mishenina

Tatyana Ivanovna Gorbaneva

Friedrich-Karl Thielemann

Sergey Korotin



Abstract

In this work we present and discuss the observations of the Mn abundances for 247 FGK dwarfs, located in the Galactic disc with metallicity -1 < [Fe/H]< +0.3. The observed stars belong to the substructures of the Galaxy thick and thin discs, and to the Hercules stream. The observations were conducted using the 1.93 m telescope at Observatoire de Haute-Provence (OHP, France) equipped with the echelle type spectrographs ELODIE and SOPHIE. The abundances were derived under the LTE approximation, with an average error for the [Mn/Fe] ratio of 0.10 dex. For most of the stars in the sample Mn abundances are not available in the literature. We obtain an evolution of [Mn/Fe] ratio with the metallicity [Fe/H] consistent with previous data compilations. In particular, within the metallicity range covered by our stellar sample the [Mn/Fe] ratio is increasing with the increase of metallicity. This due to the contribution to the Galactic chemical evolution of Mn and Fe from thermonuclear supernovae. We confirm the baseline scenario where most of the Mn in the Galactic disc and in the Sun is made by thermonuclear supernovae. In particular, the effective contribution from core-collapse supernovae to the Mn in the Solar system is about 10-20%. However, present uncertainties affecting the production of Mn and Fe in thermonuclear supernovae are limiting the constraining power of the observed [Mn/Fe] trend in the Galactic discs on, e.g., the frequency of different thermonuclear supernovae populations. The different production of these two elements in different types of thermonuclear supernovae needs to be disentangled by the dependence of their relative production on the metallicity of the supernova progenitor.

Citation

Mishenina, T., Gorbaneva, T., Thielemann, F., A. Korotin, S., -K. Thielemann, F., Pignatari, M., …Thielemann, F. (2015). Mn abundances in the stars of the Galactic disc with metallicities -1.0 < [Fe/H] < 0.3. Monthly notices of the Royal Astronomical Society, 454(2), 1585-1594. https://doi.org/10.1093/mnras/stv2038

Journal Article Type Article
Acceptance Date Sep 1, 2015
Online Publication Date Oct 6, 2015
Publication Date Dec 1, 2015
Deposit Date Nov 10, 2015
Publicly Available Date Nov 23, 2017
Journal Monthly notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 454
Issue 2
Pages 1585-1594
DOI https://doi.org/10.1093/mnras/stv2038
Keywords Stars : abundances; Stars : late-type; Galaxy : disc; Galaxy : evolution
Public URL https://hull-repository.worktribe.com/output/381059
Publisher URL http://mnras.oxfordjournals.org/content/454/2/1585.full
Copyright Statement ©2015 the Authors
Additional Information This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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