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- W1999460197 abstract "In the atmospheres of the hot stars (types O and B), the populations of the states of the helium atom are significantly different from the LTE populations. This not only gives a change in the line source function with a consequent change in the predicted line depths, but it also changes the scale of the optical depths in the lines, with a consequent change in the deduced abundance of helium. Some exploratory numerical results are given to illustrate these effects, which could explain the observed variations of the strengths of the He I and He II lines in O and B type stars. There is an important coupling between the intensities of the He I lines in the visible region of the spectrum and radiation densities at wavelengths less than 584 Å." @default.
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- W1999460197 date "1971-06-01" @default.
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- W1999460197 title "Some aspects of the non-LTE physics of the helium atom in hot stars" @default.
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- W1999460197 doi "https://doi.org/10.1016/0022-4073(71)90042-2" @default.
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