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- W3019772301 abstract "We report on the discovery of a high velocity B star, HD 69686. We estimate its space velocity, distance, surface temperature, gravity, and age. With these data, we are able to reconstruct the trajectory of the star and to trace it back to its birthplace. We use evolutionary tracks for single stars to estimate that HD 69686 was born 73 Myr ago in the outer part of our Galaxy ($r sim 12$ kpc) at a position well below the Galactic plane ($z sim -1.8$ kpc), a very unusual birthplace for a B star. Along the star's projected path in the sky, we also find about 12 other stars having similar proper motions, and their photometry data suggest that they are located at the same distance as HD 69686 and probably have the same age. We speculate on the origin of this group by star formation in a high velocity cloud or as a Galactic merger fragment." @default.
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- W3019772301 date "2009-05-01" @default.
- W3019772301 modified "2023-09-28" @default.
- W3019772301 title "HD 69686: a Mysterious High Velocity B Star" @default.
- W3019772301 hasPublicationYear "2009" @default.
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