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Distance to the anti-center shell
High-resolution, high-sensitivity echelle spectra have been obtainedtowards early-type stars located within the boundaries of theAnti-Center Shell (ACS), an anomalous velocity H I structure in theanticenter region of the Galaxy. The observations indicate that theshell is certainly more distant than 500 pc, and quite possibly moredistant than 2500 pc. No anomalous velocity C II absorption featureswere detected. These results support the hypothesis that the ACS is theresult of collision of high-velocity clouds with the Galactic H I disk.
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Observation and Astrometry data
| Constellation: | Gémeaux |
| Right ascension: | 06h27m35.94s |
| Declination: | +22°07'04.9" |
| Apparent magnitude: | 8.857 |
| Proper motion RA: | 0.4 |
| Proper motion Dec: | -5.9 |
| B-T magnitude: | 8.921 |
| V-T magnitude: | 8.863 |
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