Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
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The Chemical Composition of HD47536: A Planetary Host Halo Giant with Possible 𝛌 Bootis Features and Signs of Interstellar Matter Accretion

  • Received : 2022.11.15
  • Accepted : 2022.12.13
  • Published : 2022.12.15
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Abstract

We investigated the chemical composition of the planetary host halo star HD47536 via high-resolution spectral observations recorded using a 1.5 meter Cerro Tololo Inter-American Observatory (CTIO) telescope (Chile). Furthermore, we determined the abundances of 38 chemical elements. Both light and heavy elements were overabundant compared to the iron group elements. The abundance pattern of HD47536 was similar to that of halo-type stars, with an enrichment of heavy elements. We analyzed the relationships between the relative abundances of chemical elements and their second ionization potentials and condensation temperatures. We demonstrated that the interplay of charge-exchange reactions owing to the accretion of interstellar matter and the gas-dust separation mechanism can influence the initial abundances and can be used to qualitatively explain the abundance patterns in the atmosphere of HD47536.

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Acknowledgement

This study used the SIMBAD database, operated at CDS, Strasbourg, France. SA is thankful to the administration of ESO for financial support during his stay in Garching within a program of Ukrainian astronomers at risk and to Dr. F. Primas and N. Silva for excellent organization of their short-term visits. VK is grateful to the Vector-Stiftung at Stuttgart, Germany, for support within the program "2022 - Immediate help for Ukrainian refugee scientists" under grant P2022-0064. AD was funded by the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan (grant No. AP14972694).

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