Other
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.263..256l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 263, no. 1, p. 256-266.
Other
75
Astronomical Spectroscopy, Electron Energy, Emission Spectra, Planetary Nebulae, Balmer Series, Continuums, Discontinuity, Line Spectra, Paschen Series
Scientific paper
T(e)s derived from the observed Balmer discontinuity are presented for 14 PNe. T(e)s deduced from the Paschen discontinuity are also obtained for four of them. The new measurements, together with those published by others, are compared to temperatures deduced from the nebular-to-auroral forbidden line ratio of O III, T(e) O III na. It is shown that, on average, T(e)(Bal) tends to be lower than the T(e) O III na for the same object, indicating the presence of large temperature fluctuations. Except for a few PNe with t exp 2 greater than 0.10, t exp 2 = 0.03 is a representative value. Possible mechanisms that could be responsible for such large temperature fluctuations are discussed. The observations also reveal, for the first time two extremely weak discontinuities, one of He I at 3422 A in NGC 7009 and another of He II at 5694 A in Me 2-1.
Danziger John
Liu Xiao-Wei
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