Implementing TOPbase/Iron Project: Continuous Absorption from Fe II
Abstract
We discuss implementation of TOPbase and Iron Project opacities for stellar spectral codes. We use a technique employed by Peach, where a Boltzmann-averaged cross section is calculated for selected temperatures, and the opacity obtained from double interpolation in temperature and wavelength. It is straightforward to include {\it all} levels for which cross sections have been calculated. Boltzmann-averaged cross sections for Fe II show a local maximum between 1700 and 2000[A]. We suggest this feature arises from 3d^5 4snl to 3d^5 4pnl transitions within Fe II. IUE spectra of iron-rich CP stars show local minima in this region. Theoretical calculations of a representative stellar continuum demonstrate that Fe II photoionization contributes significantly to the observed minima.
Keywords
Cite
@article{arxiv.astro-ph/0301045,
title = {Implementing TOPbase/Iron Project: Continuous Absorption from Fe II},
author = {Charles R. Cowley and Manuel Bautista},
journal= {arXiv preprint arXiv:astro-ph/0301045},
year = {2009}
}
Comments
6 pages, 5 figures. See http://www.astro.lsa.umich.edu/users/cowley/paper2r for better definition figures