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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.ukRoyal 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

References

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