SIMBAD references

1997A&A...328..598S - Astronomy and Astrophysics, volume 328, 598-601 (1997/12-2)

Spectroscopy of the central stars of three evolved planetary nebulae.

SAURER W., WERNER K. and WEINBERGER R.

Abstract (from CDS):

We present results of a spectroscopic project that aims at investigations of stars in the upper left part of the HRD. We observed the central stars of the three old planetary nebulae PN G011.4+17.9, PN G308.2+07.7, and PN G332.5-16.9. The spectra (echelle) were analysed by fitting the H and HeII lines with theoretical profiles from a grid of non-LTE model atmospheres. The models are composed of H and He and disregard metal opacities. The three nuclei appear to be very hot (Teff near 105K) and comparison with post-AGB evolutionary tracks reveals that the masses range between 0.55 and 0.75M; the central star of PN G332.5-16.9 shows an enrichment in He and probably also in C and N.

Abstract Copyright:

Journal keyword(s): white dwarfs - planetary nebulae: individual: PN G011.4+17.9, PN G308.2+07.7, PN G332.5-16.9 - stars abundances - stars: fundamental parameters

Simbad objects: 4

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