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Title: Chemical analysis of three barium stars: HD 51959, HD 88035, HD 121447
Authors: Drisya, K
Goswami, A
Sridhar, N
Masseron, T
Meenakshi, P
Keywords: Stars: Abundances;Stars: Carbon;Stars: Late-type;Stars: Population II
Issue Date: May-2018
Publisher: Oxford University Press on behalf of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, Vol. 476, No. 3, pp. 3086–3096
Abstract: We present elemental abundance results from high resolution spectral analysis of three nitrogen-enhanced barium stars. The analysis is based on spectra obtained with the FEROS attached to 1.52m telescope at ESO, Chile. The spectral resolution is R∼48000 and the spectral coverage spans from 3500-9000Å . For the objects HD51959 and HD88035, we present the first time abundance analyses results. Although a few studies are available in literature on the object HD121447, the results are significantly different from each other. We have therefore carried out a detailed chemical composition study for this object based on a high resolution spectrum with high S/N ratio, for a better understanding of the origin of the abundance patterns observed in this star. Stellar atmospheric parameters, the effective temperature, surface gravity, microturbulence and metallicity of the stars are determined from the LTE analysis using model atmospheres. The metallicity of HD51959 and HD88035 are found to be near-solar; they exhibit enhanced abundances of neutron-capture elements. HD121447 is found to be moderately metal-poor with [Fe/H]=−0.65. While carbon is near-solar in the other two objects, HD121447 shows carbon enhancement at a level, [C/Fe]=0.82. Neutron-capture elements are highly enhanced with [X/Fe]>2 (X: Ba, La, Pr, Nd, Sm) in this object. The α- and iron-peak elements show abundances very similar to field giants with the same metallicity. From kinematic analysis all the three objects are found to be members of thin disk population with a high probability of 0.99, 0.99 and 0.92 for HD51959, HD88035 and HD121447 respectively.
Description: Restricted Access
ISSN: 1365-2966
???metadata.dc.rights???: © Royal Astronomical Society
Appears in Collections:IIAP Publications

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