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Chemical analysis of CH stars – I. Atmospheric parameters and elemental abundances

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dc.contributor.author Drisya, K
dc.contributor.author Goswami, A
dc.date.accessioned 2014-03-27T08:50:44Z
dc.date.available 2014-03-27T08:50:44Z
dc.date.issued 2014-05-11
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, Vol. 440, No. 2, pp. 1095-1113 en
dc.identifier.issn 1365-2966
dc.identifier.uri http://hdl.handle.net/2248/6582
dc.description Restricted Access en
dc.description.abstract Results from high-resolution spectral analyses of a selected sample of CH stars are presented. Detailed chemical composition studies of these objects, which could reveal abundance patterns that in turn provide information regarding nucleosynthesis and evolutionary status, are scarce in the literature. We conducted detailed chemical composition studies for these objects based on high-resolution (R ∼ 42 000) spectra. The spectra were taken from the ELODIE archive and cover the wavelength range from 3900 to 6800 Å. We estimated the stellar atmospheric parameters, the effective temperature Teff, the surface gravity log g, and the metallicity [Fe/H] from local thermal equilibrium analyses using model atmospheres. Estimated temperatures of these objects cover a wide range, from 4550 to 6030 K. The surface gravity ranges from 1.8 to 3.8, and the metallicity from −0.18 to −1.4. We report updates on elemental abundances for several heavy elements and present estimates of abundance ratios for Sr, Y, Zr, Ba, La, Ce, Pr, Nd, Sm, Eu and Dy with respect to Fe. For the object HD 188650 we present the first abundance analysis results based on a high-resolution spectrum. Enhancements of heavy elements relative to Fe, which are characteristic of CH stars, are evident from our analyses for most of the objects. A parametric model-based study was performed to understand the relative contributions from the s- and r-processes to the abundances of the heavy elements. en
dc.language.iso en en
dc.publisher Oxford University Press on behalf of the Royal Astronomical Society en
dc.relation.uri http://dx.doi.org/10.1093/mnras/stu148 en
dc.rights © Royal Astronomical Society en
dc.subject Stars: abundances en
dc.subject Stars: carbon en
dc.subject Stars: late-type en
dc.subject Stars: Population II en
dc.title Chemical analysis of CH stars – I. Atmospheric parameters and elemental abundances en
dc.type Article en

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