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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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Observation and Astrometry data
| Constellation: | Ophiucus |
| Right ascension: | 17h29m13.28s |
| Declination: | +10°53'57.6" |
| Apparent magnitude: | 7.72 |
| Distance: | 200.803 parsecs |
| Proper motion RA: | -4.7 |
| Proper motion Dec: | -16.6 |
| B-T magnitude: | 7.839 |
| V-T magnitude: | 7.73 |
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