Non-LTE line formation for iron group elements. I - Fe V

Details Non-LTE line formation for iron group elements. I - Fe V Non-LTE line formation for iron group elements. I - Fe V

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...265..647b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 265, no. 2, p. 647-655.

Astronomy and Astrophysics

Astrophysics

26

Hot Stars, Iron, Line Spectra, Metallicity, Nonequilibrium Thermodynamics, Abundance, Astronomical Models, Oscillator Strengths, Photoionization, Stellar Spectra, Ultraviolet Spectra

Scientific paper

A non-LTE line formation calculation for Fe v is introduced. The data for radiative bound-bound transitions which have been derived as part of this work are described and their accuracy is evaluated. The theoretical non-LTE spectrum of Fe v is compared to the HST spectrum of the sdO star BD + 75 deg 325 resulting in a determination of the iron abundance. It is shown that a microturbulent velocity of no more than 5 km/s is needed to match the observations and that the value of 30 km/s as postulated by Hubeny et al. (1991) from an LTE analysis is an artifact of the LTE approximation.

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