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Communication Dans Un Congrès Année : 2016

Red-giant stars: Chemical clocks in the Milky Way

Résumé

A broad effort is ongoing with large spectroscopic surveys such as APOGEE, ESO-Gaia, RAVE from which stellar parameters, radial velocities and detailed chemical abundances can be measured for CoRoT, Kepler, and K2 targets. In addition, asteroseismic data of red-giants stars observed by the space missions CoRoT and Kepler allow determination of stellar masses, radii, and can be used to determine the position and ages of stars. This association between spectroscopic and asteroseismic constraints provide a new way to understand galactic and stellar evolutions. To exploit all potential of this combination it would be crucial to develop our approach of synthetic populations. We compute stellar populations synthesis with the Besançon Galactic model including the asteroseismic and chemical properties from stellar evolution models. These synthetic populations can be compared with sinificant large surveys as APOKASC (APOGEE+Kepler) or CoRoGEE (CoRoT+APOGEE). We focus here on the carbon and nitrogen surface abundances of Kepler red-giant stars. We underline the importance of transport processes occurring in red-giant stars as rotation and thermohaline instability to understand chemical properties of stellar populations in the Galaxy. The future for this area also starts taking shape with the launch of Gaia, futur spectroscopic surveys such as 4MOST and WEAVE, and the future space mission PLATO that will provide seismic data for more than 100 000 red-giants. Such synthetic population model is a key tool to investigate future observations and better understand the evolution of the Milky Way.
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Dates et versions

hal-03864224 , version 1 (27-11-2023)

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Nadège Lagarde, A. C. Robin, C. Reylé, G. Nasello. Red-giant stars: Chemical clocks in the Milky Way. Annual meeting of the French Society of Astronomy and Astrophysics, Jun 2016, Lyon, France. pp.287 - 289. ⟨hal-03864224⟩
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