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- W2017755473 abstract "view Abstract Citations (19) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Physical Processes in Gaseous Nebulae. XV. Goldberg, Leo Abstract The statistical equilibrium of an assembly of neutral helium atoms has been investigated with refer- ence to the problem of gaseous nebulae. The helium atom was assumed to contain an infinite number of energy levels, but a single equation of equilibrium was written down for all triplet levels above 2 3po and, similarly, for all singlets above 2 ipo Mean values are thus obtained for the popiilations of the high singlets and the high triplets. The population is given in terms of a quantity b~, the ratio between the true population and the value for thermodynamic equilibrium at a temperature T~. The temperature T~ refers to an assumed Maxweffian distribution of the free electrons. The nebular atoms are assumed to be opaque to the stellar radiation field oniy in the frequencies cor- responding to absorptions from levels i IS, 2 Is, and 2 ~S. Numerical solutions of the equations are tabu- lated for stellar temperatures, T1, of 50,000° and 100,000° and electron temperatures of 5000° 10,000°, 20,0000, 40,000°, and 80,0000, and also for the special case T1 = T6 = 20,0000 Publication: The Astrophysical Journal Pub Date: March 1941 DOI: 10.1086/144261 Bibcode: 1941ApJ....93..244G full text sources ADS | Related Materials (17) Part 1: 1937ApJ....85..330M Part 2: 1937ApJ....86...70M Part 3: 1938ApJ....88...52B Part 4: 1938ApJ....88..313M Part 5: 1938ApJ....88..422B Part 6: 1939ApJ....89..587A Part 7: 1939ApJ....90..271B Part 8: 1939ApJ....90..601A Part 9: 1940ApJ....91..307S Part 10: 1940ApJ....92..408H Part 11: 1941ApJ....93..178S Part 12: 1941ApJ....93..195M Part 13: 1941ApJ....93..230M Part 14: 1941ApJ....93..236A Part 16: 1941ApJ....94...30M Part 17: 1941ApJ....94..436M Part 18: 1945ApJ...102..239A" @default.
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- W2017755473 date "1941-03-01" @default.
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- W2017755473 title "Physical Processes in Gaseous Nebulae. XV." @default.
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