Nitrogen depletion in field red giants: mixing during the He flash?

11 Oct 2016 Masseron T. Lagarde N. Miglio A. Elsworth Y. Gilmore G.

We combine simultaneous constraints on stellar evolutionary status from asteroseismology, and on nitrogen abundances derived from large spectroscopic surveys, to follow nitrogen surface abundances all along the evolution of a low-mass star, comparing model expectations with data. After testing and calibrating the observed yields from the APOGEE survey, we first show that nitrogen surface abundances follow the expected trend after the first dredge-up occurred, i.e. that the more massive is the star the more nitrogen is enhanced... (read more)

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  • SOLAR AND STELLAR ASTROPHYSICS