Abstract
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.
Publisher
The Korean Space Science Society
Subject
General Earth and Planetary Sciences,General Physics and Astronomy
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