Resolution of the classical Hyades lithium problem

Details Resolution of the classical Hyades lithium problem Resolution of the classical Hyades lithium problem

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995lea..conf..301f&link_type=abstract

The Light Element Abundances, Proceedings of an ESO/EIPC Workshop Held in Mar

Astronomy and Astrophysics

Astronomy

Dwarf Stars, G Stars, K Stars, Lithium, Opacity, Pre-Main Sequence Stars, Stellar Evolution, Abundance, Resolution, Solar Convection (Astronomy), Stellar Atmospheres, Stellar Interiors, Stellar Luminosity, Stellar Mass

Scientific paper

For the very first time, it has recently proved possible to make a well-motivated, physically plausible, and self-consistent prediction of the Hyades G- and K-dwarf (Li,Teff) relationship that matches the long-unexplained observations. The method employs the latest Iglesias &, Rogers (OPAL) interior opacities and Alexander surface opacities (whose respective values are now themselves close to empirical predictions or estimates made earlier in this Hyades project), King's recently discovered (O/Fe) enhancement (another prediction) and utterly conventional PMS (pre-main-sequence) evolution unaided by arbitrary and ad hoc adjustable parameters. Thus, the following assumptions form a self-consistent set explaining the Hyades G- and K-dwarf (Li,Teff) observations: (1) Pop. I interior opacities are now essentially correct; (2) Pop. I surface opacities are now essentially correct; (3) The Hyades distance is now essentially correct; (4) The Hyades (Fe/H) and (O/Fe) are now essentially correct, and possible changes in (Ne, Mg, or Si/Fe) are likely to have only a small effect; (5) Convective envelope overshooting is negligible; and (6) Quarreling with the above means finding at least two compensating errors in assumptions (1) through (5).

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