The effect of increasing helium abundance on the NLTE model atmospheres of hot white dwarfs
作者： Jir Kubat
DOI:
关键词: White dwarf 、 Abundance (ecology) 、 Physics 、 Astrophysics 、 Radiation 、 Line (formation) 、 Hydrogen 、 Helium 、 Plane parallel 、 Atomic physics 、 High Gravity
摘要: Plane parallel and spherically symmetric model at- mospheres for hot (Teff = 100000K) high gravity (logg =7 :5) starsarecalculatedandcomparedfordifferenthydrogen/helium abundance ratios. The effect of the changes on emergent radiation is studied. Strong dependence pro- le He ii 4686A line found low heliumabundances.Also,pronounceddependenceontheabun- dance ratio hydrogen H helium abundances.Combinationofthesetwolinesmayserveasapow- erful diagnostic tool determination hydrogen/helium in white dwarfs.
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