RMC 40 in eruptive phase: CNO and rare-earth elements

Using high-resolution optical and infrared spectra of the LBV star in the Small Magellanic Cloud, RMC 40, obtained during the eruptive phase, we determined chemical abundances of the light (CNO) and rare-earth elements. We found strong decrease in carbon abundance and strong enhancement in nitrogen abundance. The abundances of the s- and r-process elements, such as Ba, La, Ce, Pr, Nd, and Dy, are increased compared to solar-scaled values by +(0.60 - 1.0) dex, pointing to strong pollution of the stellar envelope (pseudo-photosphere) by the products of the CNO cycle and the r- and s-processes.