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5 Conclusions

We have presented low resolution spectra of the sightlines towards the M 15 globular cluster in both the Caii K and Nai D interstellar lines, and have identified high-velocity clouds with velocities between $\sim 60 {-} 80 \,{\rm km\,s^{-1}}$. The present data suggest that velocity and equivalent width variations may exist on small scales, but higher quality data are necessary to confirm this. Together with higher quality absorption line observations, high resolution Hi maps of the region would provide detailed information on the substructure and size distribution of cloudlets within the HVCs.

Acknowledgements

NL holds a postgraduate studenship from the European Social Fund and Northern Ireland Development for Research. WRJR and RSIR acknowledge financial support from the UK Particle and Astronomy Research Council.



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