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Effects of Rotation in Low-Metallicity Stars

Published online by Cambridge University Press:  26 May 2016

Sara R. Heap  and
Thierry Lanz
Sara R. Heap
Affiliation:
Bethesda MD 20817-6740
Thierry Lanz
Affiliation:
University of Maryland, College Park MD 20742 & NASA's Goddard Space Flight Center, Greenbelt MD 20771

Abstract

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We have carried out a spectral analysis of 17 O-type stars in the Small Magellanic Cloud (SMC). We find several lines of evidence that rotation plays an important role in massive stars in this low-metallicity galaxy (Z=0.2 Z⊙): (1) strong enrichment of nitrogen in half the program stars due to rotational mixing of processed material in the core up to the surface; (2) reduction of the effective gravity by the centrifugal force; (3) apparent anomalies in cluster isochrones that imply some stars are rotating at critical velocities.

Type
Session 2 Rotation in Relation with Abundances and Magnetic Fields
Information
Symposium - International Astronomical Union , Volume 215: Stellar Rotation , 2004 , pp. 220 - 221
Copyright
Copyright © Astronomical Society of the Pacific 2004 

References

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