The role of Z=0 AGB stars on the early chemical enrichment

Details The role of Z=0 AGB stars on the early chemical enrichment The role of Z=0 AGB stars on the early chemical enrichment

2000-10-18

arxiv.org/abs/astro-ph/0010365v1

Astronomy and Astrophysics

Astrophysics

3 pages, needs espcrc1.sty; conference "Nuclei in the Cosmos 2000", held in Arhus, Denmark, June 27-July 1, 2000; submitted to

Scientific paper

10.1016/S0375-9474(01)00736-9

We present theoretical evolutionary models for Z=0 stars in the mass range 4< M/Mo <8 from the pre-main sequence up to the AGB phase. Contrary to previous calculations we found that these stars develop normal thermal pulses and third dredge-up episodes. Special attention is devoted to analyze the chemical enrichment in the envelope due to the above mechanisms. As a consequence, we show that these stars become carbon and nitrogen rich. Using different IMFs proposed in the literature for the Population III stars, we study their contribution to the pre-galactic chemical enrichment. It is found that Z=0 AGB stars could significantly contribute to 7Li, 12C and 14N and produce extreme non-solar 24Mg/25Mg/26Mg ratios. However, the net contribution is very sensitive to the IMF adopted and to the fraction of primordial matter which goes into stars.

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