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Paper: Negative K-Effect in Motion of the Gould Belt Stars
Volume: 316, Order and Chaos in Stellar and Planetary Systems
Page: 224
Authors: Bobylev, V.V.
Abstract: The kinematics of the OB-stars with heliocentric distances 0.2 < r < 0.6 kpc has been investigated on the basis of Hipparcos data complemented with the radial velocities. It is established that the K-effect depends on the stellar ages, namely, Kr = +4.1 + 0.8 km/s for the youngest OB-stars and Kr = -5.0+0.6 km/s for the oldest OB-stars. The oldest giants and supergiants have negative K-effect, namely, Kr = -4.0 + 0.9 km/s for AF-stars and Kr = -5.8 + 1.0 km/s for GKM-stars. The analysis of the K-effects leads to the kinematic estimation of the Gould Belt age as T ≈ 60 Myr. It is established that there exists an evolutionary connection between the Gould and Vaucouleur– Dolidze Belts (we also associate it with the Sirius supercluster), namely, the oldest stars are in stage of compression. Due to slow rotation of these stars, the youngest OB-stars form the Gould Belt and survive expansion state. Note that the compression the stage is changed into the expansion one ≈60 Myr ago.
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