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HD 159610


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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.

Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS
Radial velocities have been determined for a sample of 2930 B2-F5 stars,95% observed by the Hipparcos satellite in the north hemisphere and 80%without reliable radial velocity up to now. Observations were obtainedat the Observatoire de Haute Provence with a dispersion of 80Ä,mm(-1) with the aim of studying stellar and galactic dynamics.Radial velocities have been measured by correlation with templates ofthe same spectral class. The mean obtained precision is 3.0 km s(-1)with three observations. A new MK spectral classification is estimatedfor all stars. Based on observations made at the Haute ProvenceObservatory, France and on data from The Hipparcos Catalogue, ESA.Tables 4, 5 and 6 are only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr or viahttp://cdsweb.u-strasbg.fr/Abstract.htm

Flamsteed stars not contained in the Yale "Catalogue of Bright Stars"
Not Available

Observations of the 21-CM Hydrogen Line Toward High-Latitude Stars
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1969ApJ...157.1101G&db_key=AST

Interstellar Gas Near the Sun.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1962ApJ...135..711M&db_key=AST

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Observation and Astrometry data

Constellation:Ophiucus
Right ascension:17h35m02.13s
Declination:+13°08'16.0"
Apparent magnitude:7.265
Distance:119.332 parsecs
Proper motion RA:2.3
Proper motion Dec:5.1
B-T magnitude:7.379
V-T magnitude:7.275

Catalogs and designations:
Proper Names
HD 1989HD 159610
TYCHO-2 2000TYC 1004-260-1
USNO-A2.0USNO-A2 0975-09404136
HIPHIP 86041

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