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HD 156127


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Distance and density of short lived H I clouds at high galactic latitudes
Very narrow interstellar absorption lines of sodium were detected inspectra of stars in the direction of a strikingly narrow and elongated HI filament, at velocities near -1.2 km/s well correlated with the H Iemission. One of the stars, SAO 30359, additionally shows an opticallystrong interstellar absorption line at V(LSR) = -10 km/s withoutcorresponding H I emission. Here, the results of the opticalobservations are presented. The size and density of a gas clump which isassumed to be responsible for this noncoincident line is derived. Fromthe distance to the stars and the presence of absorption features, anupper distance limit of d = 240 pc is derived for this high-latitude H Ifilament as well as for the gas clump.

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Observation and Astrometry data

Constellation:Δράκων
Right ascension:17h12m22.87s
Declination:+57°13'24.3"
Apparent magnitude:8.284
Distance:418.41 parsecs
Proper motion RA:9.7
Proper motion Dec:-6
B-T magnitude:8.246
V-T magnitude:8.281

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 156127
TYCHO-2 2000TYC 3895-1144-1
USNO-A2.0USNO-A2 1425-08716719
HIPHIP 84168

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