Gaia Data Release 3: Analysis of RVS spectra using the General Stellar Parametriser from spectroscopy
Abstract
The chemo-physical parametrisation of stellar spectra is essential for understanding the nature and evolution of stars and of Galactic stellar populations. Gaia DR3 contains the parametrisation of RVS data performed by the General Stellar Parametriser-spectroscopy, module. Here we describe the parametrisation of the first 34 months of RVS observations. GSP-spec estimates the chemo-physical parameters from combined RVS spectra of single stars. The main analysis workflow described here, MatisseGauguin, is based on projection and optimisation methods and provides the stellar atmospheric parameters; the individual chemical abundances of N, Mg, Si, S, Ca, Ti, Cr, FeI, FeII, Ni, Zr, Ce and Nd; the differential equivalent width of a cyanogen line; and the parameters of a DIB feature. Another workflow, based on an artificial neural network, provides a second set of atmospheric parameters that are useful for classification control. We implement a detailed quality flag chain considering different error sources. With about 5.6 million stars, the Gaia DR3 GSP-spec all-sky catalogue is the largest compilation of stellar chemo-physical parameters ever published and the first one from space data. Internal and external biases have been studied taking into account the implemented flags. In some cases, simple calibrations with low degree polynomials are suggested. The homogeneity and quality of the estimated parameters enables chemo-dynamical studies of Galactic stellar populations, interstellar extinction studies from individual spectra, and clear constraints on stellar evolution models. We highly recommend that users adopt the provided quality flags for scientific exploitation . The Gaia DR3 GSP-spec catalogue is a major step in the scientific exploration of Milky Way stellar populations, confirming the Gaia promise of a new Galactic vision (abridged).
Keywords
Cite
@article{arxiv.2206.05541,
title = {Gaia Data Release 3: Analysis of RVS spectra using the General Stellar Parametriser from spectroscopy},
author = {A. Recio-Blanco and P. de Laverny and P. A. Palicio and G. Kordopatis and M. A. Álvarez and M. Schultheis and G. Contursi and H. Zhao and G. Torralba Elipe and C. Ordenovic and M. Manteiga and C. Dafonte and I. Oreshina-Slezak and A. Bijaoui and Y. Fremat and G. Seabroke and F. Pailler and E. Spitoni and E. Poggio and O. L. Creevey and A. Abreu Aramburu and S. Accart and R. Andrae and C. A. L. Bailer-Jones and I. Bellas-Velidis and N. Brouillet and E. Brugaletta and A. Burlacu and R. Carballo and L. Casamiquela and A. Chiavassa and W. J. Cooper and A. Dapergolas and L. Delchambre and T. E. Dharmawardena and R. Drimmel and B. Edvardsson and M. Fouesneau and D. Garabato and P. Garcia-Lario and M. Garcia-Torres and A. Gavel and A. Gomez and I. Gonzalez-Santamaria and D. Hatzidimitriou and U. Heiter and A. Jean-Antoine Piccolo and M. Kontizas and A. J. Korn and A. C. Lanzafame and Y. Lebreton and Y. Le Fustec and E. L. Licata and H. E. P. Lindstrom and E. Livanou and A. Lobel and A. Lorca and A. Magdaleno Romeo and F. Marocco and D. J. Marshall and N. Mary and C. Nicolas and L. Pallas-Quintela and C. Panem and B. Pichon and F. Riclet and C. Robin and J. Rybizki and R. Santovena and A. Silvelo and R. L. Smart and L. M. Sarro and R. Sordo and C. Soubiran and M. Suvege and A. Ulla and A. Vallenari and J. Zorec and E. Utrilla and J. Bakker},
journal= {arXiv preprint arXiv:2206.05541},
year = {2023}
}
Comments
Astronomy and Astrophysics (accepted, in press)