The very lithium rich post-AGB SB2 binary HD172481

Details The very lithium rich post-AGB SB2 binary HD172481 The very lithium rich post-AGB SB2 binary HD172481

2000-10-25

arxiv.org/abs/astro-ph/0010513v1

Astronomy and Astrophysics

Astrophysics

7 pages, 5 figures, to appear in the proceedings of: "Post-AGB Objects (Proto-Planetary Nebulae) as a Phase of Stellar Evoluti

Scientific paper

Double lined spectroscopic binaries in an evolved stage of evolution are expected to be extremely rare since they must consist of equally luminous and thus almost equally evolved objects, which requires an extremely similar initial mass. In this contribution we discuss such rare double evolved SB2 system: HD172481. This binary includes an F-type post-AGB object and an M-type AGB companion. The spectrum shows a surprisingly strong LiI 670.8nm line with an equivalent width of 54mA yielding a lithium abundance of log(Li)=3.6. Several explanations for this huge lithium content are explored.

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