How Efficient is Rotational Mixing in Massive Stars ?

Details How Efficient is Rotational Mixing in Massive Stars ? How Efficient is Rotational Mixing in Massive Stars ?

2007-09-06

arxiv.org/abs/0709.0874v1

AIP Conf.Proc.990:273-275,2008

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings of "First Stars III", Santa Fe, New Mexico, July 16-20, 2007, 3 pages, 3 figures

Scientific paper

10.1063/1.2905562

The VLT-Flames Survey for Massive Stars (Evans05,Evans06) provides recise measurements of rotational velocities and nitrogen surface abundances of massive stars in the Magellanic Clouds. Specifically, for the first time, such abundances have been estimated for stars with significant rotational velocities. This extraordinary data set gives us the unique possibility to calibrate rotationally and magnetically induced mixing processes. Therefore, we have computed a grid of stellar evolution models varying in mass, initial rotational velocity and chemical composition. In our models we find that although magnetic fields generated by the Spruit-Taylor dynamo are essential to understand the internal angular momentum transport (and hence the rotational behavior), the corresponding chemical mixing must be neglected to reproduce the observations. Further we show that for low metallicities detailed initial abundances are of prime importance, as solar-scaled abundances may result in significant calibration errors.

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