GSP-spec line list for the parametrisation of Gaia -RVS stellar spectra

Abstract

The Gaia mission is a magnitude-limited whole-sky survey that collects an impressive quantity of astrometric, spectro-photometric and spectroscopic data. Among all the on-board instruments, the Radial Velocity Spectrometer (RVS) produces millions of spectra up to a magnitude of G${}_{RVS}\sim 16$. For the brightest RVS targets, stellar atmospheric parameters and individual chemical abundances are automatically estimated by the Generalized Stellar Parametriser - spectroscopy group (GSP-Spec). These data will be published with the third Gaia Data Release. Some major ingredients of the determination of these stellar parameters include the atomic and molecular line lists that are adopted to compute reference synthetic spectra, on which the parametrisation methods rely. We aim to build such a specific line list optimised for the analysis of RVS late-type star spectra. Starting from the Gaia-ESO line lists, we first compared the observed and synthetic spectra of six well-known reference late-type stars in the wavelength range covered by the RVS instrument. We then improved the quality of the atomic data for the transitions presenting the largest mismatches. The new line list is found to produce very high-quality synthetic spectra for the tested reference stars and has thus been adopted within GSP-Spec.

11 pages, 8 figures,5 Tables, Accepted for publication in Astronomy & Astrophysics

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Cited by in corpus (10)

• Gaia Data Release 3: Analysis of RVS spectra using the General Stellar Parametriser from spectroscopy
• Gaia Data Release 3: Astrophysical parameters inference system (Apsis) I -- methods and content overview
• Gaia Data Release 3: Apsis II -- Stellar Parameters
• The cerium content of the Milky Way as revealed by Gaia DR3 GSP-Spec abundances
• The Gaia-ESO Survey DR5.1 and Gaia DR3 GSP-Spec: a comparative analysis
• Chemical characterisation of the X-shooter Spectral Library (XSL): [Mg/Fe] and [Ca/Fe] abundances
• MINCE III. Detailed chemical analysis of the UVES sample
• Solid confirmation of the broad DIB around 864.8 nm using stacked Gaia-RVS spectra
• Searching for Galactic Red Supergiants with Gaia RVS Spectra
• Symbiotic binaries in the Gaia data. I. Known symbiotics in DR3 and FPR