Modeling Massive Stars with Rotation: the Case of Nitrogen Enrichments

Details Modeling Massive Stars with Rotation: the Case of Nitrogen Enrichments Modeling Massive Stars with Rotation: the Case of Nitrogen Enrichments

2008-10-03

arxiv.org/abs/0810.0657v1

Astronomy and Astrophysics

Astrophysics

8 pages, 4 figures, Comm. in Asteroseismology, Contribution to the Proceedings of the 38th LIAC, HELAS-ESTA, BAG, 2008

Scientific paper

Recently, the concept of rotational mixing has been challenged by some authors (e.g. Hunter et al. 2008). We show that the excess N/H is a multivariate function f(M, age, v, sin i, multiplicity,Z). To find a correlation of a multivariate function with some parameter, it is evidently necessary to limit as much as possible the range of the other involved parameters. When this is done, the concept of rotational mixing is supported by the observations. We also show that the sample data are not free from several biases. A fraction of about 20% of the stars may escape to the relation as a result of binary evolution.

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