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An ultra-high-resolution study of the interstellar medium in the direction of α Ophiuchi
I present very high resolution (R=400000 and R=880000) observations ofinterstellar Caii absorption lines towards eight early-type starssituated within 15° of α Oph on the sky. I confirm an earlierresult that the interstellar structure responsible for the anomalouslystrong Caii absorption towards α Oph has a spatial extent of<~1pc (and is probably very much smaller). Many discrete interstellarabsorption components are apparent in these high-resolution data, butwhile several have velocities in the range expected for the localinterstellar medium (LISM), no convincing detections of either the localinterstellar cloud (LIC), or the so-called G cloud, were made. In theformer case, I argue that the relatively weak LIC components are maskedby components arising in more distant clouds, but which have LISM-likevelocities owing to the pervasive influence of outflow from the Sco-Cenassociation. The non-detection of the G cloud is more problematical, andI tentatively argue that, previous claims notwithstanding, this featuredoes not extend to galactic latitudes as high as +15° in thisdirection.
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Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1969ApJ...157.1101G&db_key=AST
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Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1962ApJ...135..711M&db_key=AST
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