NLTE analyses of B stars in the Galactic disk.

Details NLTE analyses of B stars in the Galactic disk. NLTE analyses of B stars in the Galactic disk.

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998nabs.book.....g&link_type=abstract

NLTE analyses of B stars in the Galactic disk., by Gummersbach, C. A.. Heidelberg Univ. (Germany). Naturwissenschaftlich-Mathem

Mathematics

Scientific paper

Chemical analysis of B stars in the disk of the Milky Way between 5 and 13 kpc galactocentric distance is considered by a combination of ATLAS9 LTE model atmospheres and DETAIL/SURFACE NLTE line formation. Beside NLTE effects the very metallicity of the underlying atmosphere is proven to have a strong impact on temperature structure and line formation. The strategic hydrogen, silicon, and oxygen analyses are treated independently for transparency reasons. It is shown that the NLTE effect lowers effective temperature, gravity, and microturbulence but leaves the chemical abundances unaffected. The metallicity effect of a non-solar atmosphere, however, increases effective temperature and gravity, leaves gravity unaffected but lowers the chemical abundances. Contrary to previous work, a rather steep oxygen-abundance gradient of (-0.07±0.02) dex/kpc is found in the Galactic disk, in accordance to normal spiral galaxies. By a comparison with numerical models an age of 800 Myr is derived for the central bar structure of the Galaxy.

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