The Possible Signs of Hydrogen and Helium Accretion from Interstellar Medium on the Atmospheres of F-K Giants in the Local Region of the Galaxy
Yushchenko A. Kim S. Jeong Y. Demessinova A. Yushchenko V. Doikov D. Gopka V. Jeong K.S. Rittipruk P.
2021Korean Space Science Society
Journal of Astronomy and Space Sciences
2021#38Issue 3175 - 183 pp.
The dependencies of the chemical element abundances in stellar atmospheres with respect to solar abundances on the second ionization potentials of the same elements were investigated using the published stellar abundance patterns for 1,149 G and K giants in the Local Region of the Galaxy. The correlations between the relative abundances of chemical elements and their second ionization potentials were calculated for groups of stars with effective temperatures between 3,764 and 7,725 K. Correlations were identified for chemical elements with second ionization potentials of 12.5 eV to 20 eV and for elements with second ionization potentials higher than 20 eV. For the first group of elements, the correlation coefficients were positive for stars with effective temperatures lower than 5,300 K and negative for stars with effective temperatures from 5,300 K to 7,725 K. The results of this study and the comparison with earlier results for hotter stars confirm the variations in these correlations with the effective temperature. A possible explanation for the observed effects is the accretion of hydrogen and helium atoms from the interstellar medium.
(stars:) circumstellar matter , physical data and processes: accretion , stars: abundances , stars: atmospheres , stars: Population I , stars: Population II
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Astrocamp Contents Research Institute, Goyang, 10329, South Korea
Astronomical Observatory, Odessa National University, Odessa, 65014, Ukraine
History Department, Sejong University, Seoul, 05006, South Korea
Physico-Technical Department, Al Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Main Astronomical Observatory of National Academy of Sciences of Ukraine, Kyiv, 03143, Ukraine
Department of Mathematics, Physics Astronomy, Odessa National Maritime University, Odessa, 65029, Ukraine
Department of Natural and Technical Sciences, Odessa National Maritime University, Odessa, 65029, Ukraine
DaeYang Humanity College, Sejong University, Seoul, 05006, South Korea
National Astronomical Research Institute of Thailand, Chiangmai, 50180, Thailand
Astrocamp Contents Research Institute
Astronomical Observatory
History Department
Physico-Technical Department
Main Astronomical Observatory of National Academy of Sciences of Ukraine
Department of Mathematics
Department of Natural and Technical Sciences
DaeYang Humanity College
National Astronomical Research Institute of Thailand
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