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• W2023272564 abstract "view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Temperature Determinations for Nuclei of Thirteen Planetary Nebulae. Zanstra, H. ; Aller, L. H. Abstract The temperature determinations presented are based on calibrated slitless spectrograms showing monochromatic images as well as the continuous spectrum of the central stars. Since relative intensities of the emission lines were available, only the A value of one of the monochromatic images as compared with the adjoining star spectrum was required in addition to the electron temperature which plays a minor part. Also the influence of interstellar reddening is of minor importance. The stellar temperatures obtained were TH from the recombination of hydrogen, T from the electron energy exciting the forbidden lines, and TH,II from the Hell recombination spectrum, the star being formally treated as a blackbody and the absorption of ionizing quanta being considered complete. With one exception, the six nebulae having no observable Hell, all yield TH> T If the absorption of ionizing quanta were incomplete, one should have TH< T~~. We may conclude, therefore, that the combination of a blackbody energy distribution with complete absorption is sufficient to explain the H absorption region. Literally speaking, the absorption would be more than complete. The seven nebulae showing Hell all yield TH~vI TH and moreover, with one exception, TH < T . The latter fact may be understood by the Lyman-alpha line of Hell giving additional ionization of the hydrogen with large photo-electron energies. As a model one might tentatively adopt a temperature TH for the wavelength region x> 228, and a much higher temperature TH,II(H) for the region X <228, so there appears to be an ultraviolet excess produced by some unidentified mechanism. The stellar temperatures TH~i from recombination of helium were about 4000 higher than TH, on the average. A similar discrepancy is indicated by the spectral energy distribution of the corresponding far ultraviolet regions X<509 and X<912 from model stellar atmospheres of 0 stars. Publication: The Astronomical Journal Pub Date: 1960 DOI: 10.1086/108067 Bibcode: 1960AJ.....65Q..59Z full text sources ADS |" @default.
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• W2023272564 title "Temperature Determinations for Nuclei of Thirteen Planetary Nebulae." @default.
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