Inversion of stellar fundamental parameters from ESPaDOnS and Narval high-resolution spectra ⋆
Université de Toulouse, UPS-Observatoire Midi-Pyrénées, IRAP,
2 CNRS, Institut de Recherche en Astrophysique et Planétologie, 14 av. É. Belin, 31400 Toulouse, France
Received: 4 August 2014
Accepted: 10 November 2014
The general context of this study is the inversion of stellar fundamental parameters from high-resolution Echelle spectra. We aim at developing a fast and reliable tool for the post-processing of spectra produced by ESPaDOnS and Narval spectropolarimeters. Our inversion tool relies on principal component analysis. It allows reducing dimensionality and defining a specific metric for the search of nearest neighbours between an observed spectrum and a set of observed spectra taken from the Elodie stellar library. Effective temperature, surface gravity, total metallicity, and projected rotational velocity are derived. Various tests presented in this study that were based solely on information coming from a spectral band centred on the Mg i b-triplet and had spectra from FGK stars are very promising.
Key words: astronomical databases: miscellaneous / methods: data analysis / stars: fundamental parameters
Based on observations obtained at the Télescope Bernard Lyot (TBL, Pic du Midi, France), which is operated by the Observatoire Midi-Pyrénées, Université de Toulouse, Centre National de la Recherche Scientifique (France) and the Canada-France-Hawaii Telescope (CFHT) which is operated by the National Research Council of Canada, CNRS/INSU and the University of Hawaii (USA).
© ESO, 2014