Overabundance of s-process elements in the atmosphere of the active red giant
arXiv:1509.07771 · doi:10.1134/S1063773715100059
Abstract
Based on high-resolution (R=60000) spectra taken with the NES spectrograph (the 6-m BTA telescope, the Special Astrophysical Observatory of the Russian Academy of Science), we have determined the abundances of 26 elements, from lithium to europium, in the atmosphere of the active red giant PZ Mon, which belongs to the class of RS CVn variable stars, by the method of model stellar atmospheres. We have taken into account the hyperfine splitting, the isotopic shift, and the departure from local thermodynamic equilibrium. Analysis of our data has revealed an overabundance of lithium and neutron-capture elements compared to normal red giants. For lithium, this is explained by the activity of the star, while the overabundance of s-elements is presumably similar in nature to that in moderate barium stars.
6 pages, 2 figures, 2 tables, accepted in Astronomy Letters
References in corpus (6)
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- The lithium abundances for a large sample of red giants
- Abundance analysis of barium and mild barium stars
- Non-LTE Sodium Abundance in Galactic Thick- and Thin-Disk Red Giants
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- Evolutionary status of the active star PZ Mon