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Meenakshi Purandardas, Aruna Goswami & Sridharan Rengasamy

Peculiar Abundances of the Cool Carbon Star HE 1104-0957

(Volume 93 - Année 2024 — No 2 - Proceeedings of the 3rd BINA Workshop on the Scientific Potential of the Indo-Belgian Cooperation)
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Abstract

We present, for the first time, a detailed abundance analysis of the carbon star HE 1104−0957 based on high resolution (R ≃ 50 000) spectra. Our analysis shows that the object is an extremely metal-poor star with [Fe/H] ≃ −2.96. We find that the object shows enhancement of carbon with [C/Fe] ≃ 1.82. However, it does not fall into any of the sub-groups of carbon-enhanced metal-poor (CEMP) stars based on the characteristic elemental abundance ratios used for the classification of various CEMP sub-groups. HE 1104−0957 is also found to exhibit an enhancement of oxygen and nitrogen with [O/Fe], and [N/Fe] ≃ 1.54, and 2.54 respectively. In HE 1104−0957, α-elements are found to be slightly enhanced with [α/Fe] ≃ 0.46. Fe-peak elements are also moderately enhanced in HE 1104−0957 with a value 0.63 with respect to Fe. Our analysis shows that HE 1104−0957 exhibits enhancement of neutron-capture elements, particularly r-process elements. The low-resolution spectra of this object shows the spectral features characteristics of a typical C-R star. However, we find that the surface chemical compositions of this object is contradictory to that expected for a C-R star. It requires a detailed analysis to better understand the abundance anomalies exhibited by this object.

Keywords : Metal-poor stars, Abundances, chemically peculiar, nucleosynthesis

To cite this article

Meenakshi Purandardas, Aruna Goswami & Sridharan Rengasamy, «Peculiar Abundances of the Cool Carbon Star HE 1104-0957», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 93 - Année 2024, No 2 - Proceeedings of the 3rd BINA Workshop on the Scientific Potential of the Indo-Belgian Cooperation, 445-452 URL : https://popups.ulg.ac.be/0037-9565/index.php?id=11745.

About: Meenakshi Purandardas

Indian Institute of Astrophysics, Koramangala, II block, Bangalore, Karnataka, 560034. Corresponding author: meenakshi.p@iiap.res.in

About: Aruna Goswami

Indian Institute of Astrophysics, Koramangala, II block, Bangalore, Karnataka, 560034

About: Sridharan Rengasamy

Indian Institute of Astrophysics, Koramangala, II block, Bangalore, Karnataka, 560034