Sodium Excess in Yellow Supergiants: Implications for Rotational Mixing in Massive Main-Sequence Stars

Details Sodium Excess in Yellow Supergiants: Implications for Rotational Mixing in Massive Main-Sequence Stars Sodium Excess in Yellow Supergiants: Implications for Rotational Mixing in Massive Main-Sequence Stars

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...622.1058d&link_type=abstract

The Astrophysical Journal, Volume 622, Issue 2, pp. 1058-1067.

Astronomy and Astrophysics

Astronomy

3

Stars: Abundances, Stars: Evolution, Stars: Interiors, Stars: Rotation

Scientific paper

Recent high-quality measurements of the sodium abundance in yellow supergiants are used to test the hypothesis of rotational mixing in massive main-sequence stars. It is shown that the Na excess in a large fraction of yellow supergiants with M>~7-10Msolar can only be understood as a result of mixing of Na between the convective core and the radiative envelope in their main-sequence progenitors. We demonstrate that the vertical turbulent diffusion from the Zahn model could be responsible for this extra mixing.

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