Interpreting the Hydrogen IR Lines - Impact of Improved Electron Collision Data

Details Interpreting the Hydrogen IR Lines - Impact of Improved Electron Collision Data Interpreting the Hydrogen IR Lines - Impact of Improved Electron Collision Data

2005-12-06

arxiv.org/abs/astro-ph/0512146v1

High Resolution Infrared Spectroscopy in Astronomy. Edited by H. U. Kaeufl, R. Siebenmorgen, A.F.M. Moorwood. Berlin: Springer

Astronomy and Astrophysics

Astrophysics

6 pages, 6 figures

Scientific paper

10.1007/10995082_33

We evaluate the effect of variations in the electron-impact excitation cross sections on the non-LTE line formation for hydrogen in early-type stars. While the Balmer lines are basically unaffected by the choice of atomic data, the Brackett and Pfund series members allow us to discriminate between the different models. Non-LTE calculations based on the widely-used approximations of Mihalas, Heasley & Auer and of Johnson fail to simultaneously reproduce the observed optical and IR spectra over the entire parameter range. Instead, we recommend a reference model using data from ab-initio calculations up to principal quantum number n<=7 for quantitative work. This model is of general interest due to the ubiquity of the hydrogen spectrum.

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