Advanced ab initio relativistic calculations of transition probabilities for some O i and O iii emission lines

• Published in: Monthly notices of the Royal Astronomical Society Vol. 440; no. 4; pp. 3439 - 3443
• Main Authors: Nguyen, T. V. B., Chantler, C. T., Lowe, J. A., Grant, I. P.
• Format: Journal Article
• Language: English
• Published: London Oxford University Press 01.06.2014
• Subjects: Emissions; Experiments; Measurement; Stars & galaxies; Velocity; atomic processes; line: identification; ultraviolet: stars; atomic data; astronomical data bases: miscellaneous; techniques: spectroscopic
• DOI: 10.1093/mnras/stu511
• ISSN: 0035-8711

This work presents new ab initio relativistic calculations using the multiconfiguration Dirac–Hartree–Fock method of some O i and O iii transition lines detected in B-type and Wolf–Rayet stars. Our results are the first able to be presented in both the length and velocity gauges, with excellent gauge convergence. Compared to previous experimental and theoretical uncertainties of up to 50 per cent, our accuracies appear to be in the range of 0.33–5.60 per cent, with gauge convergence up to 0.6 per cent. Similar impressive convergence of the calculated energies is also shown. Two sets of theoretical computations are compared with earlier tabulated measurements. Excellent agreement is obtained with one set of transitions but an interesting and consistent discrepancy exists between the current work and the prior literature, deserving of future experimental studies.