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Accepted manuscript

High resolution spectral analysis of three high latitude carbon stars

Published online by Cambridge University Press:  28 April 2025

Meenakshi Purandardas*
Affiliation:
Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India
Debasish Dutta
Affiliation:
Indian Institute of Astrophysics, Koramangala, Bangalore 560034, India Indian Institute of Technology Palakkad, Kanjikode, 678623, Kerala, India Institute of Frontier Science and Application, Bangalore, India
Aruna Goswami
Affiliation:
Indian Institute of Astrophysics, Koramangala, Bangalore 560034, India
Sreeja S. Kartha
Affiliation:
Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India
*
Author for correspondence: Meenakshi Purandardas, Email: [email protected].
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Abstract

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We present the results of a detailed high-resolution spectroscopic analysis (SUBARU/HDS spectra, R∼ 50000) of three faint high latitude carbon stars HE 1104–0957, HE 1205–0521, and HE 1244–3036. Our estimated metallicity for these objects is –2.96, –2.63 and –2.49, respectively. The surface chemical compositions of the objects are found to be characterized by enhanced carbon and heavy elements, such as Y, Ba, La, and Ce. Using the classification criteria for carbon-enhanced metal-poor (CEMP) stars the objects HE 1104–0957 and HE 1205–0521 could not be classified into any known CEMP sub-classes, whereas, the object HE 1244–3036 is found to be likely a CEMP-s star. The observed abundance patterns in HE 1244–3036 are also found to match well with the yields of a 2 M AGB star with [Fe/H] = –2.50. Although our kinematic analysis indicates that the objects belong to the halo population, the elemental abundance ratios of HE 1104–0957 and HE 1205–0521 do not match well with those of typical halo objects. Estimated elemental abundances are presented, and kinematic properties of the stars are discussed.

Type
Research Article
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
Copyright
© The Author(s), 2025. Published by Cambridge University Press on behalf of Astronomical Society of Australia