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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.
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Observation and Astrometry data
| Constellation: | Orion |
| Right ascension: | 05h48m38.35s |
| Declination: | +02°50'45.3" |
| Apparent magnitude: | 9.236 |
| Proper motion RA: | 21.1 |
| Proper motion Dec: | -1.7 |
| B-T magnitude: | 9.941 |
| V-T magnitude: | 9.295 |
Catalogs and designations:
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