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The Interstellar Abundance of Lead: Experimental Oscillator Strengths for Pb ii λ1203 and λ1433 and New Detections of Pb ii in the Interstellar Medium

Published online by Cambridge University Press:  18 July 2017

A. M. Ritchey ,
N. Heidarian ,
R. E. Irving ,
S. R. Federman ,
D. G. Ellis ,
S. Cheng ,
L. J. Curtis  and
W. A. Furman
A. M. Ritchey
Affiliation:
Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195, USA email: aritchey@astro.washington.edu
N. Heidarian
Affiliation:
Department of Physics and Astronomy, University of Toledo, 2801 West Bancroft Street, Toledo, OH 43606, USA
R. E. Irving
Affiliation:
Department of Physics and Astronomy, University of Toledo, 2801 West Bancroft Street, Toledo, OH 43606, USA
S. R. Federman
Affiliation:
Department of Physics and Astronomy, University of Toledo, 2801 West Bancroft Street, Toledo, OH 43606, USA
D. G. Ellis
Affiliation:
Department of Physics and Astronomy, University of Toledo, 2801 West Bancroft Street, Toledo, OH 43606, USA
S. Cheng
Affiliation:
Department of Physics and Astronomy, University of Toledo, 2801 West Bancroft Street, Toledo, OH 43606, USA
L. J. Curtis
Affiliation:
Department of Physics and Astronomy, University of Toledo, 2801 West Bancroft Street, Toledo, OH 43606, USA
W. A. Furman
Affiliation:
Reed College, 3203 SE Woodstock Boulevard, Portland, OR 97202, USA
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Abstract

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We present the first experimentally determined oscillator strengths for the Pb ii transitions at 1203.6 Å and 1433.9 Å, obtained from lifetime measurements made using beam-foil techniques. We also present new detections of these lines in the interstellar medium from an analysis of archival spectra acquired by the Space Telescope Imaging Spectrograph onboard the Hubble Space Telescope. Our observations of the Pb ii λ1203 line represent the first detection of this transition in interstellar gas. Our experimental f-values for the Pb ii λ1203 and λ1433 transitions are consistent with recent theoretical results, including our own relativistic calculations, but are significantly smaller than previous values based on older calculations. Our new f-value for Pb ii λ1433 (0.321 ± 0.034) yields an increase in the interstellar abundance of Pb of 0.43 dex over estimates based on the f-value listed by Morton. With our revised f-values, and with our new detections of Pb ii λ1203 and λ1433, we find that the depletion of Pb onto interstellar grains is not nearly as severe as previously thought, and is very similar to the depletions seen for elements such as Zn and Sn, which have similar condensation temperatures.

Keywords

ISM: abundancesatoms – methods: laboratory – ultraviolet: ISM
Type
Addendum
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29A: Astronomy in Focus , August 2015 , E13
Copyright
Copyright © International Astronomical Union 2017 

References

Heidarian, N., Irving, R. E., Ritchey, A. M., Federman, S. R., Ellis, D. G., Cheng, S., Curtis, L. J., & Furman, W. A., 2015, ApJ, 808, 112 CrossRefGoogle Scholar