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Poster Open Access

Abundance of zirconium in the red giants of Galactic globular cluster 47 Tuc

Kolomiecas, Edgaras; Dobrovolskas, Vidas; Kučinskas, Arūnas

Wolk, Scott

By combining abundances of neutron capture and proton capture chemical elements and determining their abundance ratios we can try to constrain the possible evolutionary scenarios of Galactic globular clusters. With the purpose of identifying the possible pollution scenarios and possible polluter stars themselves we determined abundance of Zr which is a light s-process chemical element and abundance of Na in the atmospheres of 283 RGB stars in the Galactic globular cluster 47 Tuc. Abundance analysis was based on the archival spectra of RGB stars in 47 Tuc that were obtained with GIRAFFE spectrograph. Stellar model atmospheres were computed using the ATLAS9 code and were further employed to derive 1D LTE Zr abundances with the WIDTH9 package and 1D NLTE Na abundances with the MULTI code. We use the obtained results to discuss the existence of possible correlations/anticorrelations between the abundances of these chemical elements, as well as possible connections between the chemical composition of these stars and their kinematical properties.

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