Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-10-11
AIP Conf.Proc.804:214-217,2006
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures, 1 table, to appear in the Proceedings of the conference "Planetary Nebulae as Astronomical Tools", edited
Scientific paper
10.1063/1.2146279
With the aim to investigate the overall evolution of UIR band features with hardening of UV radiation (increase of the star's effective temperature) we have analysed ISO spectra for 32 C-rich stars: 20 proto-planetary nebulae and 12 planetary nebulae with Wolf-Rayet central stars. In this contribution we discuss variations in the peak position of UIR bands among analysed objects, and demonstrate that variations in the ``7.7'' to 11.3 microns flux ratio are correlated with the effective temperature (probably due to an increase of the ionization state of their carriers).
Siódmiak Natasza
Szczerba Ryszard
Szyszka Cezary
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