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• W2045188512 abstract "We have measured the spectral line intensities of the metal poor planetary nebula IC 4634. Using a photo-ionization model calculation, we try to fit the the optical and UV region spectra, i.e., Hamilton Echelle and IUE observations. From direct images, one expects complicated density variations, but the model predicts a range in densities that may be smaller than actually exist. We find N(sub epsilon) approximates 5000 /cubic meter. In spite of the geometrical complexity of the S shaped double-lobed structure, the simple photoionization model with a spherical symmetry can fit most emission lines, fairly well. The derived chemical composition has been compared with previous estimates and also with the Sun - The metallicity in IC 4634 appears to be lower than in the Sun or the average planetary nebula. The most likely temperature of the central ionizing source of IC 4634 appears to be about 55,000 K. We find a central star mass of about 0.55 Solar Mass from comparison with theoretical evolutionary tracks." @default.
• W2045188512 created "2016-06-24" @default.
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• W2045188512 date "1999-11-01" @default.
• W2045188512 modified "2023-09-27" @default.
• W2045188512 title "Chemical Abundances of the Planetary Nebula IC 4634 and Its Central Star" @default.
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• W2045188512 doi "https://doi.org/10.1086/307903" @default.
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