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| Paper: |
The Magnesium Abundance In 52 B Stars: A Test Of Metallicity |
| Volume: |
336, COSMIC ABUNDANCES as Records of Stellar Evolution and Nucleosynthesis in honor of David L. Lambert |
| Page: |
335 |
| Authors: |
Lyubimkov, L.S.; Rostopchin, S.I.; Rachkovskaya, T.M.; Poklad, D.B.; Lambert, D.L. |
| Abstract: |
From high-resolution spectra a non-LTE analysis of the Mg II 4481.2 Å feature is implemented for 52 nearby early and medium B stars on the main sequence (MS). The magnesium abundance is determined; it is found that log ε(Mg) = 7.67 ± 0.21 on average. It is shown that uncertainties in the microturbulent parameter Vt are the main source of errors in log ε(Mg). When using 36 stars with the most reliable Vt values derived from O II and N II lines, we obtain the mean abundance log ε(Mg) = 7.59 ± 0.15. The latter value is precisely confirmed for several hot B stars from an analysis of the Mg II 7877 Å weak line. The derived abundance log ε(Mg) = 7.59 ± 0.15 is in excellent agreement with the solar magnesium abundance log εSolar(Mg) = 7.55 ± 0.02, as well as with the proto-Sun abundance log εps(Mg) = 7.62 ± 0.02. Thus, it is confirmed that the Sun and the B-type MS stars in our neighborhood have the same metallicity. |
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