Abstract
Among the metal-poor dwarfs (Population II), a few are enriched in Nitrogen. Surprisingly, in spite of this peculiarity, their lithium abundance is similar to the Li abundance of the other dwarfs. Several scenarios of nitrogen enrichment are discussed, none is completely satisfactory, the most likely is a contamination by some very highly N-rich matter. But it could be speculated that these N-rich dwarfs may perhaps be stars escaped from N-rich globular clusters. An homogeneous analysis of this class of stars could be useful.The rather low level of the lithium abundance in the old dwarfs, contrasting with the high level found in the Population I, requires a surprisingly large and rapid production of Li. Recent observations show in one Population I red giant, a very high lithium abundance. This observation, in agreement with some predictions of some theoretical models of giants and/or AGB stars is very encouraging.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Proceedings of the International Astronomical Union
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
