Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-10-24
Astron.Astrophys. 365 (2001) 465-475
Astronomy and Astrophysics
Astrophysics
11 pages, 9 figures, accepted for publication in Astronomy and Astrophysics
Scientific paper
10.1051/0004-6361:20000146
We present in this paper a study on the peculiar supergiant HD172481. Its spectral type (F2Ia), high galactic latitude (b=-10.37), circumstellar dust, high radial velocity and moderate metal deficiency ([Fe/H]=-0.55) confirm the post-AGB character of this object. A detailed chemical analysis shows slight but real s-process overabundances, however no CNO-enhancement was detected. Furthermore, the spectral energy distribution and the TiO bands in the red part of the spectrum reveal a red luminous companion. The luminosity ratio of the hot F type component and this cool M type companion L(F)/L(M) is derived for a reddening of E(B-V)=0.44 (L(F)/L(M)=1.8) and indicates that the companion must also be strongly evolved and probably evolving along the AGB. Neither our photometric data-set, nor our radial velocity monitoring show evidence for orbital variability which may indicate that the period is too large for direct binary interaction. Most interestingly, a strong lithium resonance line is detected, which yields an abundance of log(Li)=3.6. Several explanations for this large lithium content are explored.
Reyniers Maarten
Winckel Hans Van
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