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Rotational mixing in close binaries

Published online by Cambridge University Press:  01 April 2008

S. E. de Mink ,
M. Cantiello ,
N. Langer ,
S.-Ch. Yoon ,
I. Brott ,
E. Glebbeek ,
M. Verkoulen  and
O. R. Pols
S. E. de Mink
Affiliation:
Astronomical Institute Utrecht, Princetonplein 5, 3584 CC Utrecht, The Netherlands email: S.E.deMink@uu.nl, M.Cantiello@uu.nl, N.Langer@uu.nl
M. Cantiello
Affiliation:
Astronomical Institute Utrecht, Princetonplein 5, 3584 CC Utrecht, The Netherlands email: S.E.deMink@uu.nl, M.Cantiello@uu.nl, N.Langer@uu.nl
N. Langer
Affiliation:
Astronomical Institute Utrecht, Princetonplein 5, 3584 CC Utrecht, The Netherlands email: S.E.deMink@uu.nl, M.Cantiello@uu.nl, N.Langer@uu.nl
S.-Ch. Yoon
Affiliation:
Dep. of Astronomy & Astrophysics, Univ. of California, Santa Cruz, CA95064, USA
I. Brott
Affiliation:
Astronomical Institute Utrecht, Princetonplein 5, 3584 CC Utrecht, The Netherlands email: S.E.deMink@uu.nl, M.Cantiello@uu.nl, N.Langer@uu.nl
E. Glebbeek
Affiliation:
Astronomical Institute Utrecht, Princetonplein 5, 3584 CC Utrecht, The Netherlands email: S.E.deMink@uu.nl, M.Cantiello@uu.nl, N.Langer@uu.nl
M. Verkoulen
Affiliation:
Astronomical Institute Utrecht, Princetonplein 5, 3584 CC Utrecht, The Netherlands email: S.E.deMink@uu.nl, M.Cantiello@uu.nl, N.Langer@uu.nl
O. R. Pols
Affiliation:
Astronomical Institute Utrecht, Princetonplein 5, 3584 CC Utrecht, The Netherlands email: S.E.deMink@uu.nl, M.Cantiello@uu.nl, N.Langer@uu.nl
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Abstract

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Rotational mixing a very important but uncertain process in the evolution of massive stars. We propose to use close binaries to test its efficiency. Based on rotating single stellar models we predict nitrogen surface enhancements for tidally locked binaries. Furthermore we demonstrate the possibility of a new evolutionary scenario for very massive (M > 40M⊙) close (P < 3 days) binaries: Case M, in which mixing is so efficient that the stars evolve quasi-chemically homogeneously, stay compact and avoid any Roche-lobe overflow, leading to very close (double) WR binaries.

Keywords

stars: rotationbinaries: closestars: Wolf-Rayetstars: abundances

References

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