Issue |
A&A
Volume 689, September 2024
|
|
---|---|---|
Article Number | A223 | |
Number of page(s) | 10 | |
Section | Stellar atmospheres | |
DOI | https://doi.org/10.1051/0004-6361/202450054 | |
Published online | 13 September 2024 |
The CARMENES search for exoplanets around M dwarfs
Magnesium and silicon abundances of K7–M5.5 stars
1
Departamento de Física de la Tierra y Astrofísica & IPARCOS-UCM (Instituto de Física de Partículas y del Cosmos de la UCM), Facultad de Ciencias Físicas, Universidad Complutense de Madrid,
28040
Madrid,
Spain
2
Centro de Astrobiología, CSIC-INTA,
Carretera de Ajalvir km 4, 28850 Torrejón de Ardoz,
Madrid,
Spain
3
Institut für Astrophysik und Geophysik, Georg-August-Universität-Göttingen,
Friedrich-Hund-Platz 1,
37077
Göttingen,
Germany
4
Centre for Planetary Habitability, Department of Geosciences, University of Oslo,
Sem Saelands vei 2b 0315
Oslo,
Norway
5
Centro de Astrobiología, CSIC-INTA,
Camino Bajo del Castillo s/n, 28691 Villanueva de la Cañada,
Madrid,
Spain
6
Universidad de La Laguna, Departamento de Astrofísica,
38206
La Laguna,
Tenerife,
Spain
7
Instituto de Astrofísica de Canarias,
c/ Vía Láctea s/n,
38205
La Laguna,
Tenerife,
Spain
8
Hamburger Sternwarte,
Gojenbergsweg 112,
21029
Hamburg,
Germany
9
Max-Planck-Institut für Astronomie,
Königstuhl 17,
69117
Heidelberg,
Germany
10
Landessternwarte, Zentrum für Astronomie der Universität Heidelberg,
Königstuhl 12,
69117
Heidelberg,
Germany
11
Instituto de Astrofísica de Andalucía (IAA-CSIC),
Glorieta de la Astronomía s/n,
18008
Granada,
Spain
12
Institut de Ciències de l’Espai (CSIC),
Campus UAB, c/ de Can Magrans s/n,
08193
Cerdanyola del Vallès,
Spain
13
Institut d’Estudis Espacials de Catalunya (IEEC),
c/ Gran Capità 2-4,
08034
Barcelona,
Spain
14
Centro Astronómico Hispano-Alemán, Observatorio de Calar Alto,
Sierra de los Filabres,
04550
Gérgal,
Almería,
Spain
Received:
21
March
2024
Accepted:
15
July
2024
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.
Key words: methods: data analysis / techniques: spectroscopic / stars: abundances / stars: atmospheres / stars: fundamental parameters / stars: late-type
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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