Lithium depletion in G and K dwarfs

Minoru Umezu, Hideyuki Saio

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


We have investigated the depletion of the surface Li abundance in low-mass main-sequence stars of 0.8-1.2 M⊙. We compare our evolutionary models with the observed Li abundances of G and K dwarfs in young open clusters (mainly the Pleiades and the Hyades clusters) and the Sun. Standard models with no mixing in the radiative zone give a NLi-Teff relation that roughly coincides with the relation for the lower envelope of the Pleiades. Standard models, however, give hardly any depletion of Li during the period between the Pleiades and Hyades ages. We have considered non-standard mixing in the radiative zone as a result of overshooting from the lower boundary of the convective envelope and rotationally induced slow turbulence. The overshooting depletes more Li in less-massive stars, while the rotational mixing affects Li depletion in a similar fashion over the entire mass range considered. We have found that reasonable agreement with observations is obtained if these types of mixing are included in the main-sequence evolution but suppressed in the pre-main-sequence phase.

Original languageEnglish
Pages (from-to)307-314
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Publication statusPublished - 2000 Aug 1
Externally publishedYes


  • Convection
  • Stars: abundances
  • Stars: evolution
  • Stars: interiors
  • Stars: rotation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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