  We present here the abundance analysis of a metal poor carbon rich lead star,
CS29497-030. High resolution and high signal to noise spectra were obtained
using the UVES spectrograph on the 8.2m VLT-Kueyen telescope. The observations
were made as a part of the Large Programme 165.N-0276, P.I. R. Cayrel.
Abundance analysis was done using the latest version of the MARCS model
atmospheres (Plez et. al. 1992) and the turbospectrum spectrum synthesis code.
We have derived Teff = 6650K from the FeI lines. Visible and infrared broad
band colours using the Alonso et al. (1996) calibration, gives similar
temperatures. A log g value of 3.5 was obtained from the ionisation equilibrium
of FeI and FeII, we remark that this gravity also satisfies the MgI/MgII,
TiI/TiII and MnI/MnII equilibria, within errors. The abundance analysis
indicates a metallicity, [Fe/H] = --2.7. A large overabundance of carbon
([C/Fe]=2.7) was found. We have also found large enhancement in the s-process
elements and in particular lead shows an extremely high abundance of
[Pb/Fe]=3.5, which makes this the star with the highest Pb/Fe ratio, up to
date. The Pb/Ba ratio is found to be high ([Pb/Ba]=1.2) and the same s true for
other second-peak s-process elements(e.g La, Ce, Nd). The star is a known
spectroscopic binary with a period of 346 days (Preston & Sneden 2000). The
abundance pattern suggests that CS 29497-30 has accreted matter from its
companion, when it was in the AGB phase.
