ATOMIC DATA AND SPECTRAL MODEL for FeII

Manuel A. Bautista, Vanessa Fivet, Connor Ballance, Pascal Quinet, Gary Ferland, Claudio Mendoza, Timothy R. Kallman

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

We present extensive calculations of radiative transition rates and electron impact collision strengths for Fe ii. The data sets involve 52 levels from the 3d7, 3d64s, and configurations. Computations of A-values are carried out with a combination of state-of-the-art multiconfiguration approaches, namely the relativistic Hartree-Fock, Thomas-Fermi-Dirac potential, and Dirac-Fock methods, while the R-matrix plus intermediate coupling frame transformation, Breit-Pauli R-matrix, and Dirac R-matrix packages are used to obtain collision strengths. We examine the advantages and shortcomings of each of these methods, and estimate rate uncertainties from the resulting data dispersion. We proceed to construct excitation balance spectral models, and compare the predictions from each data set with observed spectra from various astronomical objects. We are thus able to establish benchmarks in the spectral modeling of [Fe ii] emission in the IR and optical regions as well as in the UV Fe ii absorption spectra. Finally, we provide diagnostic line ratios and line emissivities for emission spectroscopy as well as column densities for absorption spectroscopy. All atomic data and models are available online and through the AtomPy atomic data curation environment.

Original languageEnglish
Article number174
Number of pages21
JournalAstrophysical Journal
Volume808
Issue number2
Early online date30 Jul 2015
DOIs
Publication statusPublished - 01 Aug 2015
Externally publishedYes

Keywords

  • atomic data
  • atomic processes
  • ISM: abundances
  • line: formation
  • stars: massive
  • stars: variables: T Tauri, Herbig Ae/Be

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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