The iron abundance of VEGA

Details The iron abundance of VEGA The iron abundance of VEGA

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...165..170g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 165, no. 1-2, Sept. 1986, p. 170-182.

Astronomy and Astrophysics

Astrophysics

98

Abundance, Early Stars, Iron, Stellar Spectra, A Stars, Atmospheric Models, Lyra Constellation, Magnetohydrodynamic Turbulence, Thermodynamic Equilibrium

Scientific paper

Based on high-dispersion spectra covering the wavelength range 3050-6850 A, a model-atmosphere analysis of the Fe I/Fe II spectrum of Alpha Lyr is carried out. Departures from LTE are investigated using a model iron atom with 100 levels and 75 line transitions. For most of the Fe I lines NLTE corrections to LTE abundances of roughly 0.3 dex are predicted. Much smaller NLTE effects are found for Fe II lines. A substantial underabundance of Fe relative to the sun, is deduced. The microturbulence, if assumed depth-independent, is roughly 2 km/s, confirming earlier studies. This value is much larger than the convective velocities predicted by mixing length theory.

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