Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..336..335l&link_type=abstract
Cosmic Abundances as Records of Stellar Evolution and Nucleosynthesis in honor of David L. Lambert, ASP Conference Series, Vol.
Astronomy and Astrophysics
Astronomy
1
Scientific paper
From high-resolution spectra a non-LTE analysis of the mg 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 \varepsilon(Mg) = 7.67 ± 0.21 on average. It is shown that uncertainties in the microturbulent parameter ťare the main source of errors in log \varepsilon(Mg). When using 36 stars with the most reliable ťvalues derived from ol and nl lines, we obtain the mean abundance log \varepsilon(Mg) = 7.59 ± 0.15. The latter value is precisely confirmed for several hot B stars from an analysis of the mg 7877 Å weak line. The derived abundance log \varepsilon(Mg) = 7.59 ± 0.15 is in excellent agreement with the solar magnesium abundance log \varepsilonsun(Mg) = 7.55 ± 0.02, as well as with the proto-Sun abundance log \varepsilonps(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.
Lambert David L.
Lyubimkov Leonid S.
Poklad Dmitry B.
Rachkovskaya Tamara M.
Rostopchin Sergey I.
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