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2011MNRAS.412...81M - Mon. Not. R. Astron. Soc., 412, 81-94 (2011/March-3)
Lithium abundance in the globular cluster M4: from the turn-off to the red giant branch bump.
MUCCIARELLI A., SALARIS M., LOVISI L., FERRARO F.R., LANZONI B., LUCATELLO S. and GRATTON R.G.
Abstract (from CDS):
The behaviour of the Li and Fe abundances along the entire evolutionary path is incompatible with theoretical models including pure atomic diffusion, pointing out that an additional turbulent mixing below the convective region needs to be taken into account, able to inhibit the atomic diffusion. The measured value of A(Li) and its homogeneity in the turn-off stars allow us to put strong constraints on the shape of the Li profile inside the M4 turn-off stars. The global behaviour of A(Li) with the effective temperature can be reproduced with different pristine Li abundances, depending on the kind of adopted turbulent mixing. One cannot reproduce the global trend that starts from the WMAP+BBNS A(Li) and adopts the turbulent mixing described by Richard, Michaud & Richer with the same efficiency as that used by Korn et al. to explain the Li content in NGC 6397. In fact, such a solution is not able to well reproduce simultaneously the Li abundance observed in turn-off and red giant branch stars. However, the WMAP+BBNS A(Li) can be reproduced assuming a more efficient turbulent mixing able to reach deeper stellar regions where the Li is burned.
We conclude that the cosmological Li discrepancy cannot be easily solved with the present, poor understanding of the turbulence in the stellar interiors, and a future effort to well understand the true nature of this non-canonical process is needed.
Abstract Copyright: 2010 The Authors Monthly Notices of the Royal Astronomical Society2010 RAS
Journal keyword(s): stars: abundances - stars: atmospheres - stars: Population II - globular clusters: individual: M4
VizieR on-line data: <Available at CDS (J/MNRAS/412/81): table1.dat>
Nomenclature: Table 1: [MSL2011] NNNNN N=87 among (Nos 8460-68085).
Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.
Simbad objects: 5
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