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- W2116701409 abstract "Low dispersion spectra have been obtained of five planetary nebulae in the elliptical galaxy NGC 5128 (Centaurus- A) from the catalogue of Hui et al. (1993b). The planetary nebu- lae (PN) cover a range of galactocentric radius from 7.9 to 17.7 0 (8 to 18 Kpc). The spectra display typical emission lines of H I, He I, He II, (O III), (N II) and (S II) and appear very similar to high excitation planetary nebulae in the Galaxy. This implies that, from a stellar evolution viewpoint, there should be no pe- culiar effects introduced by considering the bright cut-off of the PN luminosity function for distance estimation. In particular the brightest PN detected in NGC 5128 is not spectroscopically unusual. One of the PN shows relatively strong He II and (N II) lines and the derived N/O ratio indicates that it may be a Type I nebula, considered to arise from a high mass progenitor star. Determinations of the oxygen abundance of the five PN shows a mean value 0.5 dex below solar. Given that NGC 5128 is an el- liptical galaxy with a presumably metal rich stellar content, the low metallicities of the PN are unexpected, although a similar situation has been observed in the bulge of M 31." @default.
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- W2116701409 date "1999-06-01" @default.
- W2116701409 modified "2023-09-27" @default.
- W2116701409 title "Spectra of planetary nebulae in NGC 5128 (Centaurus-A)" @default.
- W2116701409 hasPublicationYear "1999" @default.
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