Properties of He-rich stars |
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| Authors: | M Zboril |
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| Institution: | 1.Astronomical Institute,Slovak Academy of Sciences,Tatranská Lomnica,Slovakia |
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| Abstract: | The study of He-r stellar photospheres aiming at detection of vertical stratification of helium is presented. Using high resolution
data and the spectrum synthesis method, helium enhancement was indicated in several stars in a sample and in the two He layer
model (minimum model), and it is suggested for the photosphere. The break point of helium abundance is often around a depth-mass
variable of 0.2. The He-r stars are slightly evolved, the interval of the surface gravities being (3.8–4.2), in agreement
with standard B type stars. The giant star HD68450 possesses a strong vertical stratification of helium. Previous reports
on the elemental stratification were confirmed for our sample. |
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