Diffuse Interstellar Bands as Probes of Small-Scale Interstellar Structure
Abstract
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.
- Publication:
-
The Diffuse Interstellar Bands
- Pub Date:
- February 2014
- DOI:
- 10.1017/S1743921313015779
- arXiv:
- arXiv:1307.3798
- Bibcode:
- 2014IAUS..297..141S
- Keywords:
-
- ISM: lines and bands;
- ISM: structure;
- ISM: clouds;
- binaries: visual;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 3 pages, 3 figures. Poster presentation to be published in Proc. IAU Symposium 297, The Diffuse Interstellar Bands, eds. J. Cami &