Non-LTE Equivalent Widths for NE I with Error Estimates

Details Non-LTE Equivalent Widths for NE I with Error Estimates Non-LTE Equivalent Widths for NE I with Error Estimates

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...519..303s&link_type=abstract

The Astrophysical Journal, Volume 519, Issue 1, pp. 303-313.

Astronomy and Astrophysics

Astronomy

18

Radiative Transfer, Stars: Abundances, Stars: Mass Loss

Scientific paper

Non-LTE equivalent widths for the 3s-->3p transitions of Ne I are presented. These lines, which are the strongest available for determining neon abundances in late- to mid-B stars, are known to be subject to large non-LTE strengthening. Error bounds on the equivalent widths arising from uncertainties in the atomic data are evaluated through Monte Carlo simulation, and the non-LTE predictions are explicitly shown to have converged with respect to further increases in model atom complexity. The results are obtainable as a grid of equivalent widths and theoretical uncertainties spanning the entire main-sequence range of B star stellar parameters (T_eff=10,000-31,000 K, log g=3.5-4.5, and zeta_t=0-10 km s^-1) for three choices of the neon abundance (A_Ne=7.55, 8.05, and 8.55 dex). Over most of this range, for realistic observing programs and using currently available atomic data, the limiting accuracy of neon abundance determinations based on Ne I is ~+/-0.10 dex.

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