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High-resolution spectroscopic study of the planetary nebula Abell 78

  • Selene Medina (a1) and Miriam Peña (a1)

Abstract

High resolution optical spectra of the planetary nebula Abell 78 were gathered, covering the wavelength ranges 3500–6600 Å and 3358–7361 Å, with a spectral resolution of ∼0.1 Å. Two different regions of Abell 78 are analyzed: the strongest knot near the central star which is thought to be a mass-loaded wind from the central star, and the outer, hydrogen-rich envelope. Physical parameters and chemical composition of both regions are estimated. The inner knot appears to be cooler and denser than the hydrogen-rich envelope. The chemical composition of the inner knot shows that there is almost no hydrogen near the central star and the emission is dominated by helium and processed material which has been dredged-up from the inner layers of the star. The outer, hydrogen-rich envelope appears to be deficient in heavy elements, mainly in oxygen, compared to the average abundances that are found among galactic planetary nebulae.

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Copyright

References

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Harrington, J.P., Borkowski, K.J., Tsvetanov, Z. 1995, ApJ 439, 264
Kingsburgh, R.L., Barlow, M.J. 1994, MNRAS 271,257

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