Chemical Evolution of the System of Galactic Planetary Nebulae |
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| Authors: | Yu V Lunyova A F Kholtygin |
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| Institution: | (1) V. V. Sobolev Astronomical Institute, Saint Petersburg State University, Russia |
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| Abstract: | The problem of the chemical evolution of the system of Galactic planetary nebulae, starting with the early stage of development of the Galaxy, is investigated. The radial and vertical gradients of C, N, O, Ne, Ar, Cl, and S abundances are determined for different ages of the precursor stars of the nebulae. A statistically significant age dependence of the gradients is derived. |
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| Keywords: | ISM planetary nebulae planetary nebulae evolution |
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