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Abundances of Mg and K in the atmospheres of turn-off starsin Galactic globular cluster 47 Tucanae

By A. Černiauskas, A. Kučinskas, J. Klevas, V. Dobrovolskas, S. Korotin, P. Bonifacio, H.-G. Ludwig, E. Caffau and M. Steffen


Aims. We determined abundances of Mg and K in the atmospheres of 53 (Mg) and 75 (K) turn-off (TO) stars of the Galactic globular cluster 47 Tuc. The obtained abundances, together with those of Li, O, and Na that we had earlier determined for the same sample of stars, were used to search for possible relations between the abundances of K and other light elements, Li, O, Na, and Mg, as well as the connections between the chemical composition of TO stars and their kinematical properties. Methods. Abundances of Mg and K were determined using archival high resolution VLT FLAMES/GIRAFFE spectra, in combination with the one-dimensional (1D) non-local thermodynamic equilibrium (NLTE) spectral synthesis methodology. Spectral line profiles were computed with the MULT

Topics: globular clusters: individual: NGC 104, stars: late-type, stars: atmospheres, stars: abundances, techniques: spectroscopic, convection
Publisher: EDP Sciences
DOI identifier: 10.1051/0004-6361/201731659
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