Systematic investigation of chemical abundances derived using IR spectra obtained with GIANO

Abstract

Detailed chemical abundances of Galactic stars are needed in order to improve our knowledge of the formation and evolution of our galaxy, the Milky Way. We took advantage of the GIANO archive spectra to select a sample of Galactic disc stars in order to derive their chemical inventory and to compare the abundances we derived from these infrared spectra to the chemical pattern derived from optical spectra. We analysed high-quality spectra of 40 stars observed with GIANO. We derived the stellar parameters from the photometry and the Gaia data-release 2 (DR2) parallax; the chemical abundances were derived with the code MyGIsFOS. For a subsample of stars we compared the chemical pattern derived from the GIANO spectra with the abundances derived from optical spectra. We derived P abundances for all 40 stars, increasing the number of Galactic stars for which phosphorus abundance is known. We could derive abundances of 14 elements, 8 of which are also derived from optical spectra. The comparison of the abundances derived from infrared and optical spectra is very good. The chemical pattern of these stars is the one expected for Galactic disc stars and is in agreement with the results from the literature. GIANO is providing the astronomical community with an extremely useful instrument, able to produce spectra with high resolution and a wide wavelength range in the infrared.

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References in corpus (11)

• New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey
• A new implementation of the infrared flux method using the 2MASS catalogue
• Three-dimensional mapping of the local interstellar medium with composite data
• Gaia-ESO Survey: The analysis of high-resolution UVES spectra of FGK-type stars
• APOGEE: The Apache Point Observatory Galactic Evolution Experiment
• NLTE determination of the aluminium abundance in a homogeneous sample of extremely metal-poor stars
• The Gaia-ESO Survey: the chemical structure of the Galactic discs from the first internal data release
• The forbidden 1082 nm line of sulphur: the photospheric abundance of sulphur in the Sun and 3D effects
• Carbon and Oxygen in Nearby Stars: Keys to Protoplanetary Disk Chemistry
• Detection of Neutral Phosphorus in the Near Ultraviolet Spectra of Late-Type Stars
• The fiber-fed preslit of GIANO at T.N.G

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• Chemical abundances of 1111 FGK stars from the HARPS-GTO planet search sample. III. Sulfur
• The Galactic Chemical Evolution of phosphorus observed with IGRINS
• The GAPS Programme at TNG -- XXV. Stellar atmospheric parameters and chemical composition through GIARPS optical and near-infrared spectra
• The Galactic Distribution of Phosphorus: A Survey of 163 Disk and Halo Stars
• Phosphorus Abundances in the Hyades and Galactic Disk
• Study of the departures from LTE in the unevolved stars infra-red spectra
• Line-depth ratios as indicators of effective temperature and surface gravity
• Unveiling the chemical fingerprint of phosphorus-rich stars I. In the infrared region of APOGEE-2
• Probing 3D and NLTE models using APOGEE observations of globular cluster stars
• The present-day cosmic phosphorus abundance