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Rotating stellar interior models at Z=10−5 and CNO yields for early galactic evolution

Published online by Cambridge University Press:  26 May 2016

Georges Meynet  and
André Maeder
Georges Meynet
Affiliation:
Observatoire de Genève, CH-1290 Sauverny, la Suisse
André Maeder
Affiliation:
Observatoire de Genève, CH-1290 Sauverny, la Suisse

Abstract

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We calculate a grid of star models with and without the effects of axial rotation for stars in the mass range between 2 and 60 M⊙ for the metallicity Z = 10–5. We find that in these models primary nitrogen is produced during the He-burning phase by rotational diffusion of 12C into the H-buraing shell. The intermediate mass stars of very low Z are the main producers of primary 14N, but massive stars also contribute to this production; no significant primary nitrogen is made in models at metallicity Z = 0.004 or above. We calculate the chemical yields in He, C, N, O and heavy elements and discuss the chemical evolution of the CNO elements at very low Z. Remarkably, the C/O vs. O/H diagram is mainly sensitive to the interval of stellar masses, while the N/O vs. O/H diagram is mainly sensitive to the average rotation of the stars contributing to the element synthesis.

Type
Part 2. Interiors of Massive Stars
Information
Symposium - International Astronomical Union , Volume 212: A Massive Star Odyssey: From Main Sequence to Supernova , 2003 , pp. 341 - 345
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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