Volume 636, April 2020
|Number of page(s)||15|
|Published online||06 April 2020|
ODUSSEAS: a machine learning tool to derive effective temperature and metallicity for M dwarf stars★
Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP,
Rua das Estrelas,
2 Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal
3 Instituto Federal do Paraná, Campus Foz do Iguaçu, 85860000 Foz do Iguaçu-PR, Brazil
4 Casimiro Montenegro Filho Astronomy Center, Itaipu Technological Park, 85867-900 Foz do Iguaçu-PR, Brazil
Accepted: 19 February 2020
Aims. The derivation of spectroscopic parameters for M dwarf stars is very important in the fields of stellar and exoplanet characterization. The goal of this work is the creation of an automatic computational tool able to quickly and reliably derive the Teff and [Fe/H] of M dwarfs using optical spectra obtained by different spectrographs with different resolutions.
Methods. ODUSSEAS (Observing Dwarfs Using Stellar Spectroscopic Energy-Absorption Shapes) is based on the measurement of the pseudo equivalent widths for more than 4000 stellar absorption lines and on the use of the machine learning Python package “scikit-learn” for predicting the stellar parameters.
Results. We show that our tool is able to derive parameters accurately and with high precision, having precision errors of ~30 K for Teff and ~0.04 dex for [Fe/H]. The results are consistent for spectra with resolutions of between 48 000 and 115 000 and a signal-to-noise ratio above 20.
Key words: stars: fundamental parameters / stars: atmospheres / stars: late-type / methods: data analysis / techniques: spectroscopic
ODUSSEAS can be tested by downloading the files from https://github.com/AlexandrosAntoniadis/ODUSSEAS, after reading the README instructions for clarifying the technical details.
© ESO 2020
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