PG 0009+036: a rapidly rotating normal B star in the galactic halo.

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Galaxy: Halo, Stars: Early-Type, Stars: Formation, Stars: Rotation

Scientific paper

We present the spectroscopic analysis of a rapidly rotating main sequence B star at high galactic latitude. From optical and ultraviolet spectra of PG 0009+036 we find for the atmospherical parameters T_eff_=14500K, logg=3.9, and a rotational velocity of vsini=320km/s. The effects of rotation on the fundamental parameters of the star are discussed and a mass of 4.8-5.8Msun_ is derived. PG 0009+036 is located 5.0-5.4kpc below the galactic plane at a distance of 5.9-6.4kpc. The star is most likely born in the disk and afterwards ejected into the halo.

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