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Empirical Verification of the Fe II Oscillator Strengths in the FUSE Bandpass*

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© 2000. The American Astronomical Society. All rights reserved. Printed in U.S.A.
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Author e-mails

howk@pha.jhu.edu

sembach@pha.jhu.edu

kroth@pha.jhu.edu

kruk@pha.jhu.edu

Author affiliations

1 Department of Physics and Astronomy, The Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218

Dates

Received 2000 June 16
Accepted 2000 July 18

Citation

J. Christopher Howk et al 2000 ApJ 544 867

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DOI

https://doi.org/10.1086/317263

Keywords

atomic data; ISM: abundances; ISM: atoms; ultraviolet: ISM

Journal RSS feed

0004-637X/544/2/867

Abstract

We report empirical determinations of atomic oscillator strengths, or f-values, for 11 ground-state transitions of Fe II in the wavelength range 1050 lesssim λ lesssim 1150 Å. We use ultraviolet absorption-line observations of interstellar material toward stars in the Galaxy and the Magellanic Clouds taken with Copernicus, the Goddard High Resolution Spectrograph on board the Hubble Space Telescope, and the Far-Ultraviolet Spectroscopic Explorer. We derive absolute oscillator strengths by a combination of the apparent optical depth, component-fitting, and curve-of-growth fitting techniques. Our derived oscillator strengths are generally in excellent agreement with recent theoretical calculations by Raassen & Uylings using the orthogonal operator technique. However, we identify three of the 11 transitions studied here whose f-values seem to be incompatible with these calculations by as much as a factor of 2. We suggest revisions to these f-values based on our analysis.

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Footnotes

  • * 

    Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute. STScI is operated by the Association of Universities for Research in Astronomy, Inc. under the NASA contract NAS 5-26555.

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