Atmospheric chemical composition of the peculiar carbon giant TU Gem


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The evolutionary status of the bright peculiar carbon giant TU Gemis fairly uncertain. The possibility that this is aCH star—aGalactic halo star with characteristic chemical-composition anomalies—is considered. Unfortunately, data on the atmospheric chemical composition of TUGem are relatively few and are ambiguous. The results of an analysis of a moderate-resolution optical and near-infrared spectrum of TU Gem obtained on the 2-m telescope of Terskol Peak Observatory (Northern Caucasus) is presented. The atmospheric parameters of TU Gem Teff = 3100 K, C/O = 1.10, and [N/Fe] = 0.0 for the derived metallicity [Fe/H] = 0.0 are taken from [1]. The abundances of Na, Mg, Ca, Ti, and Cr are estimated to be normal or slightly enhanced, and the lithium abundance is log N(Li) = +0.1. The abundances of s-process elements are substantially enhanced in the atmosphere of TU Gem, namely, [s/Fe] ≈ 2, for both light and heavy s-process elements. The range of uncertainty in [Fe/H] is 0.0−0.3, and the uncertainties in other estimates are Δ[M/Fe]≈ ±0.3 and Δ[s/Fe] = ±0.5. The results show that TU Gem is an anomalous carbon giant, but not a CH star.

作者简介

L. Yakovina

Main Astronomical Observatory

编辑信件的主要联系方式.
Email: yakovina@mao.kiev.ua
乌克兰, Kiev

G. Polinovskii

Main Astronomical Observatory

Email: yakovina@mao.kiev.ua
乌克兰, Kiev

Ya. Pavlenko

Main Astronomical Observatory; Centre for Astrophysics Research

Email: yakovina@mao.kiev.ua
乌克兰, Kiev; Hatfield, Hertfordshire

M. Kuznetsov

National Institute of Astrophysics, Optics, and Electronics

Email: yakovina@mao.kiev.ua
墨西哥, Luis Enrique Erro 1, Tonantzintla, Puebla

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