HD 69686: a Mysterious High Velocity B Star

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

we report a newly found high velocity B star, HD 69686, in our spectroscopic survey of field B stars. Its space velocity, distance, key physical parameters (surface temperature, gravity), and age are derived. With these data, we are able to reconstruct the trajectory of the star, and to trace it back to its birthplace. We found that HD 69686 came from the out rim of our Galaxy ($r \sim 13$ kpc), and traveled a long distance before reaching its current position in the solar neighborhood. More surprisingly, our analysis seems to suggest that HD 69686 was born at a place well below the galactic plane ($z \sim -2$ kpc) 80 Myrs ago, a very unusual birthplace for a B star. Along with the projected HD 69686's path on the sky, we also found about 10 more objects 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 too. If these high proper motion stars (including HD 69686) did come from the same origin: born far below the galactic plane 80Myrs ago, then there is one interesting question waiting for answer: what did trigger the star formation at a such unusual location in the Galaxy?

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