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HD 161075


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A study of the interstellar gas between the sun and the Sagittarius arm
The velocity field of the interstellar gas is examined in the 345-28 deggalactic longitude interval by means of Ca II K lines in high dispersionspectra. The radial velocities of the K lines are compared with 21-cmself-absorption velocities in both dark clouds (Knapp, 1972) and theextended feature mapped by Riegel and Crutcher (1972). Evidence ispresented to show that the extended +7 km/sec feature is more distantthan 500 pc. Two current hypotheses about the structure of the local gasnear the sun, one based upon a ring of expanding matter, the other beinga linear density-wave perturbation, are compared with the observations.The expanding ring model is in better agreement with the observed K-linevelocities.

Mesures d'étoiles doubles faites aux Observatoires Yerkes et McDonald
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Observation and Astrometry data

Constellation:Ophiucus
Right ascension:17h43m00.53s
Declination:+12°15'29.8"
Apparent magnitude:9.58
Proper motion RA:-2.6
Proper motion Dec:-9.2
B-T magnitude:9.815
V-T magnitude:9.6

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 161075
TYCHO-2 2000TYC 1001-170-1
USNO-A2.0USNO-A2 0975-09601667

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