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Title: Chemical Analysis of a Carbon-Enhanced Very Metal-Poor Star: CD-27 14351
Authors: Drisya, K
Goswami, A
Masseron, T
Keywords: Stars: carbon;Stars: chemically peculiar;Stars: late-type;Stars: low-mass
Issue Date: 1-Jan-2017
Publisher: IOP Publishing
Citation: The Astrophysical Journal, Vol. 834, No. 1, 61
Abstract: We present, for the first time, an abundance analysis of a very metal-poor carbon-enhanced star CD-27 14351 based on a high-resolution (R ~ 48,000) FEROS spectrum. Our abundance analysis performed using local thermodynamic equilibrium model atmospheres shows that the object is a cool star with stellar atmospheric parameters, effective temperature T eff = 4335 K, surface gravity log g = 0.5, microturbulence ξ = 2.42 km s−1, and metallicity [Fe/H] = −2.6. The star exhibits high carbon and nitrogen abundances with [C/Fe] = 2.89 and [N/Fe] = 1.89. Overabundances of neutron-capture elements are evident in Ba, La, Ce, and Nd, with estimated [X/Fe] > 1, the largest enhancement being seen in Ce with [Ce/Fe] = 2.63. While the first peak s-process elements Sr and Y are found to be enhanced with respect to Fe, ([Sr/Fe] = 1.73 and [Y/Fe] = 1.91), the third peak s-process element Pb could not be detected in our spectrum at the given resolution. Europium, primarily an r-process element also shows an enhancement with [Eu/Fe] = 1.65. With [Ba/Eu] = 0.12, the object CD-27 14351 satisfies the classification criterion for a CEMP-r/s star. The elemental abundance distributions observed in this star are discussed in light of the chemical abundances observed in other CEMP stars in the literature.
Description: Restricted Access
ISSN: 0004-637X
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