Abstract
Low metallicity star HD121135 ([Fe/H] =-1.5) have been investigated spectroscopically. Its atmos-pheric parameters and elemental abundances have beendetermined, including elements of neutron (n-) captureprocesses, which are the keys in the study of early Galaxyenrichment. Na, Mg, Ni, Co, Sr, Y, Zr, Mo, Ba, La, Ce, Pr,Sm, Eu, Gd, Dy, Ho, Os, Th abundances were calculatedusing the synthetic spectrum method, factoring in the hy-perfine structure (HFS) for the Eu II lines. Si, Ca, Sc abun-dances were determined using the equivalent widths oftheir lines. The carbon content was computed by the molec-ular synthesis fitting for the region of CH (4300-4330 AA).For the abundances determinations of C, Na, Mg, Ba, andTh the NLTE corrections have been applied.We have determined for the first time the abundancesof several n-capture elements and found that the behaviorsof these elements do not show a significant trend withincreasing atomic number. The elements ratios of [Eu/Fe]= 0.06, [Ba/Eu] = 0.13, [Sr/Ba] = - 0.05 do not support theHD121135 status as a r-process enrichment star. We haveobtained the thorium abundance [Th/Fe] = 0.26. The car-bon content confirms the effect of canonical additionalmixing in this star.
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