Maeder, A, Meynet, G, Ekstrom, S, Hirschi, R and Georgy, C (2008) Massive Stars as Cosmic Engines through the Ages. Proceedings of the International Astronomical Union, 3 (S250). pp. 3-16. ISSN 1743-9221

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Some useful developments in the model physics are briefly presented, followed by model results on chemical enrichments and WR stars. We discuss the expected rotation velocities of WR stars. We emphasize that the (C+O)/He ratio is a better chemical indicator of evolution for WC stars than the C/He ratios. With or without rotation, at a given luminosity the (C+O)/He ratios should be higher in regions of lower metallicity Z. Also, for a given (C+O)/He ratio the WC stars in lower Z regions have higher luminosities. The WO stars, which are likely the progenitors of supernovae SNIc and of some GRBs, should preferentially be found in regions of low Z and be the descendants of very high initial masses. Finally, we emphasize the physical reasons why massive rotating low Z stars may also experience heavy mass loss

Item Type: Article
Additional Information: Massive Stars as Cosmic Engines, Proceedings IAU Symposium No. 250, 2007. This is the accepted author manuscript (AAM). The final published version (version of record) is available online via Cambridge University Press at - please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: stars, early-type, Wolf-Rayet, rotation, mass loss
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 13 Dec 2016 11:43
Last Modified: 13 Dec 2016 11:43

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