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Diffuse Interstellar Bands as Probes of Small-Scale Interstellar Structure

Published online by Cambridge University Press:  21 February 2014

K. T. Smith ,
M. A. Cordiner  and
P. J. Sarre
K. T. Smith
Affiliation:
School of Chemistry, The University of Nottingham, Nottingham, NG7 2RD, UK email: kts@ras.org.uk Royal Astronomical Society, Burlington House, Piccadilly, London, W1J 0BQ, UK
M. A. Cordiner
Affiliation:
NASA Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20770, USA
P. J. Sarre
Affiliation:
School of Chemistry, The University of Nottingham, Nottingham, NG7 2RD, UK email: kts@ras.org.uk
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Abstract

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We present observations which probe the small-scale structure of the interstellar medium using diffuse interstellar bands (DIBs). Towards HD 168075/6 in the Eagle Nebula, significant differences in DIB absorption are found between the two lines of sight, which are separated by 0.25 pc, and λ 5797 exhibits a velocity shift. Similar data are presented for four stars in the μ Sgr system. We also present a search for variations in DIB absorption towards κ Vel, where the atomic lines are known to vary on scales of ~ 10 AU. Observations separated by ~ 9 yr yielded no evidence for changes in DIB absorption strength over this scale, but do reveal an unusual DIB spectrum.

Keywords

ISM: lines and bandsISM: structureISM: cloudsbinaries: visual
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S297: The Diffuse Interstellar Bands , May 2013 , pp. 141 - 143
Copyright
Copyright © International Astronomical Union 2014 

References

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Smith, K. T. 2010, PhD thesis, The University of NottinghamGoogle Scholar
Smith, K. T., Fossey, S. J., Cordiner, M. A., Sarre, P. J., Smith, A. M., Bell, T. A., & Viti, S. 2013, MNRAS, 429, 939Google Scholar