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The nitrogen abundance in the atmospheres of single and binary stars
The nitrogen abundances for 47 single, 11 visual double, and 41 closebinary stars are obtained from high-dispersion Wlambdadeterminations of nitrogen lines using atmospheric models andtheoretical calculations of N II lines, taking LTE errors into account.The mean value of lg N(N) is found to be 8.05 for single stars, 8.50 forclose binaries, and 8.15 for visual double stars. A correlation is foundbetween the nitrogen abundance and the helium and carbon abundances. Itis suggested that considerable mixing between the central part of starsand the atmosphere occurs in binary stars.
| The carbon abundance in the atmospheres of single and binary stars
The carbon abundance in the atmospheres of single stars and the brightercomponents of binary stars are determined on the basis ofhigh-dispersion W(lambda) data, using the LTE atmospheric model for C IIlines and the non-LTE model for C III lines. The mean value of lg N (C)for 38 single stars was found to be 8.5 + or - 0.3. For 48 binary stars,the mean value was 8.3 + or - 0.3. The lesser carbon abundance in theatmospheres of binary stars may be explained by a more intense transferof matter from hydrogen burning regions to the atmosphere in theCNO-cycle compared to normal single stars.
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