Lithium abundance in the nitrogen-rich halo dwarfs

Details Lithium abundance in the nitrogen-rich halo dwarfs Lithium abundance in the nitrogen-rich halo dwarfs

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...163..140s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 163, no. 1-2, July 1986, p. 140-144. CNRS-supported research.

Astronomy and Astrophysics

Astrophysics

91

Abundance, Dwarf Stars, Lithium, Nitrogen, Nuclear Fusion, Stellar Composition, Binary Stars, Stellar Atmospheres, Stellar Spectra

Scientific paper

The observation of the lithium line of all the five nitrogen-rich halo dwarfs shows that four of these stars have the same lithium abundances as the normal halo dwarfs. The absence of lithium in the fifth star is not surprising, since this star is not as metal-deficient as the other nitrogen-rich stars, and since it seems that lithium is destroyed in about one third of the moderately metal-deficient dwarfs. The presence of lithium in the majority of the nitrogen-rich halo dwarfs excludes any general explanation of enhancement of the nitrogen abundance by a mixing between the surface and the deep layers of the star. This kind of process, indeed, would lead to a rapid destruction of lithium. Another process has to be at work (for at least three of these five stars) to explain the nitrogen enrichment.

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