The Kinematics and Nature of Gould's Belt -- a 30 MYR Old Star Forming Region

Details The Kinematics and Nature of Gould's Belt -- a 30 MYR Old Star Forming Region The Kinematics and Nature of Gould's Belt -- a 30 MYR Old Star Forming Region

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..507l&link_type=abstract

Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 507-512

Physics

22

Scientific paper

For a sample of 2440 non-supergiant Hipparcos stars belonging to Stroemgren's `early group' luminosities, temperatures, ages and distances have been determined. 241 stars younger than 30 Myr with well determined ages and space velocities fall within the local flattened system, inclined 20deg to the galactic plane, called Gould's Belt. The system is dominated by a number of nearby prominent associations within a distance of 700 pc, foremost the Scorpius-Centaurus and Orion associations. We derive galactic rotation parameters for young stars of ages less than 30 Myr situated outside the Gould Belt region. This gives a flat rotation curve with a circular angular velocity at the Sun of Omega_c = 25.3 +/- 1.5 km/s kpc^(-1). The kinematics of Gould's Belt differs significantly from that of stars outside the system. Besides a slight outwards motion of a few km/s it rotates in the same direction as the galactic rotation and expands, giving apparent values for the galactic rotation parameters of B = -21 and K = +12 km/s kpc^(-1). It is suggested that this system was born about 30 - 40 Myr ago, possibly in a spiral arm, with an angular momentum too large to keep the system gravitationally bound. The rotation may explain the flatness of this inclined system.

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