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Chemical Abundances of the S Star GZ Peg

Published online by Cambridge University Press:  05 March 2013

L. Pompéia
L. Pompéia*
Affiliation:
IP&D, Universidade do Vale do Paraíba, Av. Shishima Hifumi, 2911, São, José dos Campos, 12244–000 SP, Brazil. Email: pompeia@univap.br
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Abstract

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The chemical compositions of stars from the Asymptotic Giant Branch are still poorly known due to the low temperatures of their atmospheres and therefore the presence of many molecular transitions hampering the analysis of atomic lines. One way to overcome this difficulty is by the study of lines in regions free from molecular contamination. We have chosen some of those regions to study the chemical abundance of the S-type star GZ Peg. Stellar parameters are derived from spectroscopic analysis and a metallicity of –0.77 dex is found. Chemical abundances of 9 elements are reported and an enhancement of s-process elements is inferred, typical to that of an S-type star.

Keywords

stars: abundance, stars: evolution, stars: late-type
Type
Observations
Information
Publications of the Astronomical Society of Australia , Volume 26 , Issue 3 , 2009 , pp. 354 - 358
Copyright
Copyright © Astronomical Society of Australia 2009

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