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Verfasst von:Passegger, Vera Maria [VerfasserIn]   i
 Bello-García, A. [VerfasserIn]   i
 Ordieres-Meré, J. [VerfasserIn]   i
 Antoniadis-Karnavas, A. [VerfasserIn]   i
 Marfil, E. [VerfasserIn]   i
 Duque-Arribas, C. [VerfasserIn]   i
 Amado, P. J. [VerfasserIn]   i
 Delgado-Mena, E. [VerfasserIn]   i
 Montes, D. [VerfasserIn]   i
 Rojas-Ayala, B. [VerfasserIn]   i
 Schweitzer, A. [VerfasserIn]   i
 Tabernero, H. M. [VerfasserIn]   i
 Béjar, V. J. S. [VerfasserIn]   i
 Caballero, J. A. [VerfasserIn]   i
 Hatzes, A. P. [VerfasserIn]   i
 Henning, Thomas [VerfasserIn]   i
 Pedraz, S. [VerfasserIn]   i
 Quirrenbach, Andreas [VerfasserIn]   i
 Reiners, A. [VerfasserIn]   i
 Ribas, I. [VerfasserIn]   i
Titel:Metallicities in M dwarfs
Titelzusatz:investigating different determination techniques
Verf.angabe:V.M. Passegger, A. Bello-García, J. Ordieres-Meré, A. Antoniadis-Karnavas, E. Marfil, C. Duque-Arribas, P.J. Amado, E. Delgado-Mena, D. Montes, B. Rojas-Ayala, A. Schweitzer, H.M. Tabernero, V.J.S. Béjar, J.A. Caballero, A.P. Hatzes, Th. Henning, S. Pedraz, A. Quirrenbach, A. Reiners, and I. Ribas
E-Jahr:2022
Jahr:24 February 2022
Umfang:33 S.
Fussnoten:Gesehen am 20.04.2022
Titel Quelle:Enthalten in: Astronomy and astrophysics
Ort Quelle:Les Ulis : EDP Sciences, 1969
Jahr Quelle:2022
Band/Heft Quelle:658(2022), Artikel-ID A194, Seite 1-33
ISSN Quelle:1432-0746
Abstract:Deriving metallicities for solar-like stars follows well-established methods, but for cooler stars such as M dwarfs, the determination is much more complicated due to forests of molecular lines that are present. Several methods have been developed in recent years to determine accurate stellar parameters for these cool stars (<i>T<i/><sub>eff<sub/> ≲ 4000 K). However, significant differences can be found at times when comparing metallicities for the same star derived using different methods. In this work, we determine the effective temperatures, surface gravities, and metallicities of 18 well-studied M dwarfs observed with the CARMENES high-resolution spectrograph following different approaches, including synthetic spectral fitting, analysis of pseudo-equivalent widths, and machine learning. We analyzed the discrepancies in the derived stellar parameters, including metallicity, in several analysis runs. Our goal is to minimize these discrepancies and find stellar parameters that are more consistent with the literature values. We attempted to achieve this consistency by standardizing the most commonly used components, such as wavelength ranges, synthetic model spectra, continuum normalization methods, and stellar parameters. We conclude that although such modifications work quite well for hotter main-sequence stars, they do not improve the consistency in stellar parameters for M dwarfs, leading to mean deviations of around 50-200 K in temperature and 0.1-0.3 dex in metallicity. In particular, M dwarfs are much more complex and a standardization of the aforementioned components cannot be considered as a straightforward recipe for bringing consistency to the derived parameters. Further in-depth investigations of the employed methods would be necessary in order to identify and correct for the discrepancies that remain.
DOI:doi:10.1051/0004-6361/202141920
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext ; Verlag: https://doi.org/10.1051/0004-6361/202141920
 Volltext: https://www.aanda.org/articles/aa/abs/2022/02/aa41920-21/aa41920-21.html
 DOI: https://doi.org/10.1051/0004-6361/202141920
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1799648494
Verknüpfungen:→ Zeitschrift

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