[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.5303/JKAS.2004.37.4.273

HIGH DISPERSION OPTICAL SPECTROSCOPY OF PLANETARY NEBULAE

HYUNG SIEK (School of Science Education (Astronomy), Chungbuk National University)

Publication Information

Journal of The Korean Astronomical Society / v.37, no.4, 2004 , pp. 273-279 More about this Journal

Abstract

Chemical compositions of planetary nebulae are of interest for a study of the late stage of stellar evolution and for elemental contributions to the interstellar medium of reprocessed elements since possibly a large fraction of stars in 0.8 - 8 $M_{\bigodot}$ range go through this stage. One of the methods for getting chemical composition is a construction of theoretical photoionization models, which involves geometrical complexities and a variety of physical processes. With modelling effort, one can analyze the high dispersion and find the elemental abundances for a number of planetary nebulae. The model also gives the physical parameter of planetary nebula and its central star physical parameter along with the knowledge of its evolutionary status. Two planetary nebulae, NGC 7026 and Hu 1-2, which could have evolved from about one solar mass progenitor stars, showed radically different chemical abundances: the former has high chemical abundances in most elements, while the latter has extremely low abundances. We discuss their significance in the light of the evolution of our Galaxy.

Keywords

ISM; Planetary Nebula; individuals (NGC 7026, Hu 1-2, NGC 7009); Symbiotic star (AG Peg); abundances; emission spectra;

Citations & Related Records

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