HeII4686 line intensities of PN (Tylenda+, 1994)

Details HeII4686 line intensities of PN (Tylenda+, 1994) HeII4686 line intensities of PN (Tylenda+, 1994)

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ycat..41060559t&link_type=abstract

VizieR On-line Data Catalog: J/A+AS/106/559. Originally published in: 1994A&AS..106..559T

Computer Science

Planetary Nebulae, Spectroscopy

Scientific paper

We have compiled the intensities of the HeII 4686 lines measured in Galactic planetary nebulae. We present a few observational diagrams related to this parameter, and discuss them with the help of theoretical diagrams obtained from simple model planetary nebulae surrounding evolving central stars of various masses. We determine the hydrogen and helium Zanstra temperature for all the objects with accurate enough data. We argue that, for Galactic planetary nebulae as a whole, the main cause for the Zanstra discrepancy is leakage of stellar ionizing photons from the nebulae. (2 data files).

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