| タイトル | High-velocity interstellar gas toward HD 169454 |
| 著者（英） | Lambert, D. L.; Federman, S. R. |
| 著者所属（英） | NASA Headquarters; Jet Propulsion Lab., California Inst. of Tech. |
| 発行日 | 1992-08-01 |
| 言語 | eng |
| 内容記述 | The interstellar spectrum of HD 169454 reveals Na D and Ca K absorption at about + 100 km/s. Measurements made at high resolution resolve 4 narrow (about 2-3 km/s) features whose N(Ca II)/N(Na I) ratios are small. This high-velocity gas is, therefore, unique in that it resembles local quiescent gas, not shocked gas. Redshifted gas is also seen in moderate-resolution spectra of faint stars lying in the same portion of the sky as HD 169454. The resulting picture is one in which a supernova explosion or stellar winds within the Sct OB3 association at a distance of about 1.5 kpc is pushing quiescent gas away from the sun. The gas is seen only in stars estimated to be at most 3 kpc, but greater than 2 kpc, away. If HD 169454 is at this greater distance, its absolute magnitude would be about -9, making it the second most luminous B star in the Galaxy. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 92A49740 |
| 権利 | Copyright |
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