The Chemical Composition of HD47536: A Planetary Host Halo Giant with Possible λ Bootis Features and Signs of Interstellar Matter Accretion

Yushchenko A. Doikov D. Andrievsky S. Jeong Y. Yushchenko V. Rittipruk P. Kovtyukh V. Demessinova A. Gopka V. Raikov A. Jeong K.S.
2022 Korean Space Science Society

Journal of Astronomy and Space Sciences
2022 #39 Issue 4 169 - 180 pp.

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.

physical data and processes: accretion , stars: abundances , stars: atmospheres , stars: circumstellar matter , stars: individual (HD47536) , stars: population II

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Astrocamp Contents Research Institute, Goyang, 10329, South Korea
Astronomical Observatory, Odessa National University, Odessa, 65014, Ukraine
Department of Natural and Technical Sciences, Odessa National Maritime University, Odessa, 65029, Ukraine
Observatoire de Paris-Meudon, CNRS, Universite Paris Diderot, Cedex, Meudon, 92125, France
Institut für Astronomie und Astrophysik, Kepler Center for Astro and Particle Physics, Universität Tübingen, Tübingen, D-72076, Germany
Department of History, Sejong University, Seoul, 05006, South Korea
Main Astronomical Observatory of National Academy of Sciences of Ukraine, Kyiv, 03143, Ukraine
National Astronomical Research Institute of Thailand, Chiangmai, 50180, Thailand
Physico-Technical Department, Al Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Pulkovo Observatory, Russian Academy of Sciences, Saint Petersburg, 196140, Russian Federation
Special Astrophysical Observatory, Russian Academy of Sciences, Nizhny Arkhyz, 369167, Russian Federation
Institute of Liberal Education, Incheon National University, Incheon, 22012, South Korea

Astrocamp Contents Research Institute
Astronomical Observatory
Department of Natural and Technical Sciences
Observatoire de Paris-Meudon
Institut für Astronomie und Astrophysik
Department of History
Main Astronomical Observatory of National Academy of Sciences of Ukraine
National Astronomical Research Institute of Thailand
Physico-Technical Department
Pulkovo Observatory
Special Astrophysical Observatory
Institute of Liberal Education

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