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2021ApJ...921...77S - Astrophys. J., 921, 77-77 (2021/November-1)

Probing the nucleosynthetic contribution of low-metallicity, low-mass star companions of CEMP stars.


Abstract (from CDS):

The observed abundance diversities among CEMP stars can shed light on the formation and evolution of elements in the early Galaxy. In this work, we present results obtained from a detailed abundance analysis of a sample of seven extrinsic carbon stars. The analysis is based on high-resolution spectra obtained with HCT/HESP (R∼60,000) and SUBARU/HDS (R∼50,000). We present, for the first time, the elemental abundance results for the objects BD-19 132, BD-19 290, HE 1304-2111, HE 1354-2257, and BD+19 3109. Abundances of a few elements are available in the literature for HE 1157-0518 and HD 202851; we present an update on the abundances of these elements along with new abundance estimates for several other elements. Our analysis confirms the object HD 202851 to be a CH star. While BD-19 132, HE 1354-2257, and BD+19 3109 are found to be CEMP-s stars, the objects BD-19 290, HE 1157-0518, and HE 1304-2111 are found to belong to CEMP-r/s group. The observed abundance patterns of the three CEMP-r/s stars are well reproduced with the i-process model predictions. While the objects BD+19 3109 and HD 202851 are confirmed binaries, the binary status of the remaining objects is not known. Analysis based on different elemental abundance ratios confirms low-mass former AGB companions for all the objects. Kinematic analysis shows that BD-19 290, HE 1157-0518, HE 1354-2257, and BD+19 3109 belong to the Galactic halo, whereas BD-19 132, HE 1304-2111, and HD 202851 are members of Galactic thin disk.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Population II stars

Simbad objects: 16

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