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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: | Dragon |
| 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 |
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