Temperature fluctuations in planetary nebulae.

Details Temperature fluctuations in planetary nebulae. Temperature fluctuations in planetary nebulae.

Nov 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...303..535g&link_type=abstract

Astronomy and Astrophysics, v.303, p.535

Astronomy and Astrophysics

Astrophysics

21

Planetary Nebulae: General

Scientific paper

Theoretical temperature fluctuations (t^2^) are obtained for typical planetary nebula conditions. Results are given for the temperature fluctuation of the most commonly observed ions (H^+^, N^+^, O^+^, O^++^, Ne^++^, S^+^, and S^++^). Since the results show that t^2^ is more important for planetary nebulae (PNe) with high stellar temperatures, we discuss some observed PNe with stellar temperature greater than 100000K. For these objects, the ionic abundances relative to H^+^ are calculated with and without considering the temperature fluctuation. The calculations show that the ionic relative abundances are higher in the second case, but, due to the combined effect of stellar temperature and luminosity, as well as of the density, t^2^ of the analysed objects are not high. Consequently, the difference in the ionic abundance determination by the two methods are less than 20%, except for S^+^ ions, for which the deviation can reach 40%.

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