Grids of stellar models with rotation VIII: Models from 1.7 to 500 M_⊙ at metallicity Z = 10^-5
arxiv(2024)
摘要
Grids of stellar evolution models with rotation using the Geneva stellar
evolution code (Genec) have been published for a wide range of metallicities.
We introduce the last remaining grid of Genec models, with a metallicity of
Z=10^-5. We study the impact of this extremely metal-poor initial
composition on various aspects of stellar evolution, and compare it to the
results from previous grids at other metallicities. We provide electronic
tables that can be used to interpolate between stellar evolution tracks and for
population synthesis. Using the same physics as in the previous papers of this
series, we computed a grid of stellar evolution models with Genec spanning
masses between 1.7 and 500 M_⊙, with and without rotation, at a
metallicity of Z=10^-5. Due to the extremely low metallicity of the models,
mass-loss processes are negligible for all except the most massive stars. For
most properties (such as evolutionary tracks in the Hertzsprung-Russell
diagram, lifetimes, and final fates), the present models fit neatly between
those previously computed at surrounding metallicities. However, specific to
this metallicity is the very large production of primary nitrogen in moderately
rotating stars, which is linked to the interplay between the hydrogen- and
helium-burning regions. The stars in the present grid are interesting
candidates as sources of nitrogen-enrichment in the early Universe. Indeed,
they may have formed very early on from material previously enriched by the
massive short-lived Population III stars, and as such constitute a very
important piece in the puzzle that is the history of the Universe.
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