New population synthesis approach:The golden path to constrain stellar
  andgalactic 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 andGaia-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 Besan\c{c}on 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
nextstep 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.
