New population synthesis approach: The golden path to constrain stellar and galactic physics

The cornerstone mission of the European Space Agency, Gaia, has revealed properties of 260 000 white dwarfs in the Galaxy, allowing us for the first time to constrain the evolution of white dwarfs with a large sample. Complementary surveys (CoRoT, Kepler, K2, APOGEE and Gaia-ESO), will revolutionize...

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Bibliographic Details
Published in:Proceedings of the International Astronomical Union 2019-10, Vol.15 (S357), p.184-187
Main Authors: Lagarde, Nadège, Reylé, Céline
Format: Article
Language:English
Subjects:
Astronomy
Chemical properties
Contributed Papers
Galactic evolution
Red giant stars
Stars & galaxies
Stellar age
Stellar evolution
Stellar populations
Stellar seismology
Synthesis
White dwarf stars
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Summary:The cornerstone mission of the European Space Agency, Gaia, has revealed properties of 260 000 white dwarfs in the Galaxy, allowing us for the first time to constrain the evolution of white dwarfs with a large sample. Complementary surveys (CoRoT, Kepler, K2, APOGEE and Gaia-ESO), will revolutionize our understanding of the formation and history of our Galaxy, providing accurate stellar masses, radii, ages, distances, and chemical properties for very large samples of stars across different Galactic stellar populations. To exploit the potential of the combination of spectroscopic, seismic and astrometric observations, the population synthesis approach is a very crucial and efficient tool. We develop the Besançon Galaxy model (BGM, Lagarde et al.2017) for which stellar evolution predictions are included, providing the global asteroseismic properties and the surface chemical abundances along the evolution of low- and intermediate-mass stars. For the first time, the BGM can explore the effects of an extra-mixing occurring in red-giant stars Lagarde et al.2019, changing their stellar properties. The next step is to model a consistent treatment of giant stars and their remnants (e.g., white dwarfs). This kind of improvement would help us to constrain stellar and Galactic evolutions.
ISSN:1743-9213
1743-9221
DOI:10.1017/S1743921320001003