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Li-7 abundances in halo stars: Testing stellar evolution models and the primordial Li-7 abundance

Mar, 1994
26 pages
Published in:
  • Astrophys.J. 433 (1994) 510
e-Print:
DOI:
Report number:
  • CITA-94-12
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Abstract: (arXiv)
A large number of stellar evolution models with [Fe/H] = -2.3 and -3.3 have been calculated in order to determine the primordial 7^7Li abundance and to test current stellar evolution models by a comparison to the extensive database of Li abundances in extremely metal poor halo stars observed by Thorburn (1994). Standard models do a good job of fitting the observed Li abundances in stars hotter than 5600 K. They predict a primordial 7^7Li abundance of Log N(Li) = 2.24\pm 0.03.Modelswhichincludemicroscopicdiffusionpredictadownwardcurvatureinthe. Models which include microscopic diffusion predict a downward curvature in the ^7Lidestructionisochronesathottemperatureswhichisnotpresentintheobservations.Thus,theobservationsclearlyruleoutmodelswhichincludeuninhibitedmicroscopicdiffusionofLi destruction isochrones at hot temperatures which is not present in the observations. Thus, the observations clearly rule out models which include uninhibited microscopic diffusion of ^7Lifromthesurfaceofthestar.The[Fe/H]=−2.3stellarmodelswhichincludebothdiffusionandrotationalmixingprovideanexcellentmatchtotheobservations.Boththeplateaustarsandtheheavilydepletedcoolstarsarewellfitbythesemodels.TherotationalmixingleadstoconsiderableLi from the surface of the star. The [Fe/H] = -2.3 stellar models which include both diffusion and rotational mixing provide an excellent match to the observations. Both the plateau stars and the heavily depleted cool stars are well fit by these models. The rotational mixing leads to considerable ^7LidepletioninthesemodelsandtheprimordialLi depletion in these models and the primordial ^7LiabundanceinferredfromthesemodelsisLogN(Li)=Li abundance inferred from these models is Log N(Li) = 3.08\pm 0.1$.