Predictions for Self-Pollution in Globular Cluster Stars | Zendy

P. Ventura | Zendy; F. D’Antona | Zendy; I. Mazzitelli | Zendy; R. Gratton | Zendy

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Predictions for Self-Pollution in Globular Cluster Stars

Author(s) -

P. Ventura,

F. D’Antona,

I. Mazzitelli,

R. Gratton

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/319496

Subject(s) - physics , nucleosynthesis , astrophysics , stars , globular cluster , asymptotic giant branch , accretion (finance) , stellar evolution , abundance (ecology) , neon , abundance of the chemical elements , big bang nucleosynthesis , astronomy , atomic physics , argon , fishery , biology

Full evolutionary models have been built to follow the phases of asymptoticgiant branch evolution with mass loss for metal mass fractions from Z=0.0002 toZ=0.004. For the first time, we find that temperatures close to or even largerthan 10^8 K are achieved at low Z; the full CNO cycle operates at the base ofthe envelope, the Oxygen abundance for the most metal-poor models of 4 and 5solar masses is drastically reduced, and sodium and aluminum production by byproton capture on neon and magnesium can occur. These results may be relevantfor the evolution of primordial massive globular clusters: we suggest that thelow-mass stars may have been polluted at the surface by accretion from the gasthat was lost from the evolving intermediate-mass stars at early ages.Comment: 14 pages, 6 figure

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