The creation of superrich lithium giants

Details The creation of superrich lithium giants The creation of superrich lithium giants

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392l..71s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 392, no. 2, June 20, 1992, p. L71-L74. Research supported by Cali

Astronomy and Astrophysics

Astrophysics

174

Asymptotic Giant Branch Stars, Metallicity, Stellar Composition, Stellar Evolution, Stellar Mass, Lithium, Milky Way Galaxy, Stellar Envelopes, Stellar Luminosity

Scientific paper

A time-dependent 'convective diffusion' algorithm has been coupled for the first time with a self-consistent full evolutionary computation in order to investigate theoretically the creation of superrich lithium stars on the asymptotic giant branch. Stars of 3, 4, 5, 6, and 7 solar mass stars were considered for Z = 0.02 and Z = 0.001. Superrich lithium stars were produced when convective envelope base temperatures exceeded 50 x 10 exp 6 K. Abundances of log epsilon (7Li) about 4.5 were obtained for stars of mass 4-6 solar masses, lying in the luminosity range M(bol) about -6 to -7, in excellent agreement with observations. High lithium abundances persist for 10 exp 4 - 10 exp 5 yr. The superrich lithium abundances are independent of the star's earlier lithium history.

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